A Model Based Closure Approach For Turbulent Combustion Using The One Dimensional Turbulence Model

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A Model-Based Closure Approach for Turbulent Combustion Using the One-Dimensional Turbulence Model

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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Book Synopsis A Model-Based Closure Approach for Turbulent Combustion Using the One-Dimensional Turbulence Model by :

Download or read book A Model-Based Closure Approach for Turbulent Combustion Using the One-Dimensional Turbulence Model written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new model-based closure approach for turbulent combustion using the One-Dimensional turbulence model (ODT) is developed and validated in context to a turbulent jet diffusion flame. The interaction of turbulence and chemistry provides interesting finite rate chemistry effects including the phenomena of extinction and re-ignition. The ODT model resolves both spatially and temporally all the scales in a turbulent reaction flow problem, thus, combining the accuracy of a DNS like solver with efficiency by reduction in the number of dimensions. The closure approach is based on identifying the mechanisms responsible for the above mentioned effects and parameterizing the ODT results with a minimum set of scalars transported in the coarse grained solvers like the Reynolds-Averaged Navier-Stokes (RANS) or Large Eddy Simulation (LES). Thus, the closure from ODT is based on a "one-way" coupling between the coarse grained solvers and ODT. Two approaches for closure are developed in the present work with respect to a RANS solver; however, they can be easily extended to LES. The first approach relies on ODT to provide the history effects associated with the geometry, which represent the interactions of turbulence and chemistry, by tabulating scalar statistics (first and second moments) on two parameters measuring, the extent of mixing, the radial mean mixture fraction, and the extent of entrainment, the centerline mean mixture fraction. However, based on the above parameterization, the approach is limited to jet diffusion flame geometry. Furthermore, the closure requires a one to one correspondence between the flames simulated in the coarse grained solver and ODT. As a second approach, the results from ODT are parameterized based on general representative scalars; mixture fraction, which specifies the mixedness of the mixture and temperature, which specifies the reactedness of the mixture. The history effects associated with the flow geometry are provided by the RANS solver in t.

A Model-based Closure Approach for Turbulent Combustion Using the One-Dimensional Turbulence Model

Author : Bhargav Bindiganavile Ranganath
Publisher :
ISBN 13 :
Total Pages : 198 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis A Model-based Closure Approach for Turbulent Combustion Using the One-Dimensional Turbulence Model by : Bhargav Bindiganavile Ranganath

Download or read book A Model-based Closure Approach for Turbulent Combustion Using the One-Dimensional Turbulence Model written by Bhargav Bindiganavile Ranganath and published by . This book was released on 2006 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new model-based closure approach for turbulent combustion using the One-Dimensional turbulence model (ODT) is developed and validated in context to a turbulent jet diffusion flame. The interaction of turbulence and chemistry provides interesting finite rate chemistry effects including the phenomena of extinction and re-ignition. The ODT model resolves both spatially and temporally all the scales in a turbulent reaction flow problem, thus, combining the accuracy of a DNS like solver with efficiency by reduction in the number of dimensions. The closure approach is based on identifying the mechanisms responsible for the above mentioned effects and parameterizing the ODT results with a minimum set of scalars transported in the coarse grained solvers like the Reynolds-Averaged Navier-Stokes (RANS) or Large Eddy Simulation (LES). Thus, the closure from ODT is based on a 'one-way' coupling between the coarse grained solvers and ODT.

Turbulent Combustion Modeling

Author : Tarek Echekki
Publisher : Springer Science & Business Media
ISBN 13 : 9400704127
Total Pages : 496 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Turbulent Combustion Modeling by : Tarek Echekki

Download or read book Turbulent Combustion Modeling written by Tarek Echekki and published by Springer Science & Business Media. This book was released on 2010-12-25 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent combustion sits at the interface of two important nonlinear, multiscale phenomena: chemistry and turbulence. Its study is extremely timely in view of the need to develop new combustion technologies in order to address challenges associated with climate change, energy source uncertainty, and air pollution. Despite the fact that modeling of turbulent combustion is a subject that has been researched for a number of years, its complexity implies that key issues are still eluding, and a theoretical description that is accurate enough to make turbulent combustion models rigorous and quantitative for industrial use is still lacking. In this book, prominent experts review most of the available approaches in modeling turbulent combustion, with particular focus on the exploding increase in computational resources that has allowed the simulation of increasingly detailed phenomena. The relevant algorithms are presented, the theoretical methods are explained, and various application examples are given. The book is intended for a relatively broad audience, including seasoned researchers and graduate students in engineering, applied mathematics and computational science, engine designers and computational fluid dynamics (CFD) practitioners, scientists at funding agencies, and anyone wishing to understand the state-of-the-art and the future directions of this scientifically challenging and practically important field.

A Novel Hybrid Scheme for Large Eddy Simulation of Turbulent Combustion Based on the One-Dimensional Turbulence Model

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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Book Synopsis A Novel Hybrid Scheme for Large Eddy Simulation of Turbulent Combustion Based on the One-Dimensional Turbulence Model by :

Download or read book A Novel Hybrid Scheme for Large Eddy Simulation of Turbulent Combustion Based on the One-Dimensional Turbulence Model written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A hybrid numerical scheme based on large eddy simulation (LES) and the one-dimensional turbulence (ODT) model for turbulent combustion is developed and validated. The ODT model resolves, both temporally and spatially, subgrid scale processes such as mixing, molecular transport, and chemistry. This model addresses the limitations of traditional models in representing strong local and transient phenomena such as ignition or extinction and processes strongly dependent on cross-correlations of different scalars. The ODT model formulation and numerical implementation involves the treatment of different processes governing the transport and chemistry for scalars and momentum through a combination of stochastic and deterministic solutions, which are implemented in parallel on the ODT domains. These domains are embedded in the LES computational domain. The ODT-based and the LES solutions provide a coupled set of solutions for scalars and momentum with redundancy in the way these quantities can be computed. The key processes included in the proposed formulation are: molecular processes consisting of reaction and diffusion, turbulent stirring, and filtered convection. In the present study, turbulent stirring is represented by random, instantaneous rearrangements of the fields of transported variables along a one-dimensional line via 'triplet maps', which emulate the rotational folding effects of turbulent eddies. Molecular diffusion and chemistry are solved deterministically through finite-difference solutions of the unsteady reaction-diffusion transport equation along the 1D domain. A novel method to incorporate 3D convection in ODT, denoted as 'node convection' combined with 'intra-node relaxation', is implemented. The Smagorinsky model is used as a subgrid stress closure model for LES. The coupling of LES and ODT is accomplished spatially by interpolating velocity information from LES to ODT and temporally at each LES time step. The problem of non-homogeneous autoignition.

Modeling and Simulation of Turbulent Combustion

Author : Santanu De
Publisher : Springer
ISBN 13 : 9811074100
Total Pages : 663 pages
Book Rating : 4.8/5 (11 download)

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Book Synopsis Modeling and Simulation of Turbulent Combustion by : Santanu De

Download or read book Modeling and Simulation of Turbulent Combustion written by Santanu De and published by Springer. This book was released on 2017-12-12 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive review of state-of-the-art models for turbulent combustion, with special emphasis on the theory, development and applications of combustion models in practical combustion systems. It simplifies the complex multi-scale and nonlinear interaction between chemistry and turbulence to allow a broader audience to understand the modeling and numerical simulations of turbulent combustion, which remains at the forefront of research due to its industrial relevance. Further, the book provides a holistic view by covering a diverse range of basic and advanced topics—from the fundamentals of turbulence–chemistry interactions, role of high-performance computing in combustion simulations, and optimization and reduction techniques for chemical kinetics, to state-of-the-art modeling strategies for turbulent premixed and nonpremixed combustion and their applications in engineering contexts.

A Novel Hybrid Scheme for Large Eddy Simulation of Turbulent Combustion Based on the One-dimensional Turbulence Model

Author : Shufen Cao
Publisher :
ISBN 13 :
Total Pages : 213 pages
Book Rating : 4.:/5 (718 download)

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Book Synopsis A Novel Hybrid Scheme for Large Eddy Simulation of Turbulent Combustion Based on the One-dimensional Turbulence Model by : Shufen Cao

Download or read book A Novel Hybrid Scheme for Large Eddy Simulation of Turbulent Combustion Based on the One-dimensional Turbulence Model written by Shufen Cao and published by . This book was released on 2006 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: Direct Numerical Simulation, Large Eddy Simulation, Turbulent Combustion, One-Dimensional Turbulence Model.

Turbulent Combustion

Author : Norbert Peters
Publisher : Cambridge University Press
ISBN 13 : 1139428063
Total Pages : 322 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Turbulent Combustion by : Norbert Peters

Download or read book Turbulent Combustion written by Norbert Peters and published by Cambridge University Press. This book was released on 2000-08-15 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combustion of fossil fuels remains a key technology for the foreseeable future. It is therefore important that we understand the mechanisms of combustion and, in particular, the role of turbulence within this process. Combustion always takes place within a turbulent flow field for two reasons: turbulence increases the mixing process and enhances combustion, but at the same time combustion releases heat which generates flow instability through buoyancy, thus enhancing the transition to turbulence. The four chapters of this book present a thorough introduction to the field of turbulent combustion. After an overview of modeling approaches, the three remaining chapters consider the three distinct cases of premixed, non-premixed, and partially premixed combustion, respectively. This book will be of value to researchers and students of engineering and applied mathematics by demonstrating the current theories of turbulent combustion within a unified presentation of the field.

Fundamentals Of Turbulence Modelling

Author : Ching Jen Chen
Publisher : CRC Press
ISBN 13 : 9781560324058
Total Pages : 312 pages
Book Rating : 4.3/5 (24 download)

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Book Synopsis Fundamentals Of Turbulence Modelling by : Ching Jen Chen

Download or read book Fundamentals Of Turbulence Modelling written by Ching Jen Chen and published by CRC Press. This book was released on 1997-12-01 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focuses on the second-order turbulence-closure model and its applications to engineering problems. Topics include turbulent motion and the averaging process, near-wall turbulence, applications of turbulence models, and turbulent buoyant flows.

Fundamentals of Turbulent and Multiphase Combustion

Author : Kenneth Kuan-yun Kuo
Publisher : John Wiley & Sons
ISBN 13 : 111809929X
Total Pages : 914 pages
Book Rating : 4.1/5 (18 download)

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Book Synopsis Fundamentals of Turbulent and Multiphase Combustion by : Kenneth Kuan-yun Kuo

Download or read book Fundamentals of Turbulent and Multiphase Combustion written by Kenneth Kuan-yun Kuo and published by John Wiley & Sons. This book was released on 2012-07-03 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed coverage of advanced combustion topics from the author of Principles of combustion, Second Edition Turbulence, turbulent combustion, and multiphase reacting flows have become major research topics in recent decades due to their application across diverse fields, including energy, environment, propulsion, transportation, industrial safety, and nanotechnology. Most of the knowledge accumulated from this research has never been published in book form—until now. Fundamentals of Turbulent and Multiphase Combustion presents up-to-date, integrated coverage of the fundamentals of turbulence, combustion, and multiphase phenomena along with useful experimental techniques, including non-intrusive, laser-based measurement techniques, providing a firm background in both contemporary and classical approaches. Beginning with two full chapters on laminar premixed and non-premixed flames, this book takes a multiphase approach, beginning with more common topics and moving on to higher-level applications. In addition, Fundamentals of Turbulent and Multiphase Combustion: Addresses seven basic topical areas in combustion and multiphase flows, including laminar premixed and non-premixed flames, theory of turbulence, turbulent premixed and non-premixed flames, and multiphase flows Covers spray atomization and combustion, solid-propellant combustion, homogeneous propellants, nitramines, reacting boundary-layer flows, single energetic particle combustion, and granular bed combustion Provides experimental setups and results whenever appropriate Supported with a large number of examples and problems as well as a solutions manual, Fundamentals of Turbulent and Multiphase Combustion is an important resource for professional engineers and researchers as well as graduate students in mechanical, chemical, and aerospace engineering.

Study of Finite-Rate Chemistry Effects on Turbulent Jet Diffusion Flames and Non-homogeneous Autoigntion Using the One-Dimensional Turbulence Model

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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Book Synopsis Study of Finite-Rate Chemistry Effects on Turbulent Jet Diffusion Flames and Non-homogeneous Autoigntion Using the One-Dimensional Turbulence Model by :

Download or read book Study of Finite-Rate Chemistry Effects on Turbulent Jet Diffusion Flames and Non-homogeneous Autoigntion Using the One-Dimensional Turbulence Model written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In current study Numerical simulation of turbulent combustion process is approached using One Dimensional Turbulence (ODT) model. The ODT model is based on the coupling of molecular processes (reaction and diffusion) with turbulent transport in a spatially- and temporally-resolved fashion over a one-dimensional domain. The domain corresponds to a transverse (or radial) direction; while, the transient evolution of the thermo-chemical scalars on the 1D domain represents the spatial evolution downstream of the jet inlet. The linear-eddy approach for modeling molecular mixing in turbulent flow involves stochastic simulation on a 1D domain with sufficient resolution to predict all relevant physical length scales properly. Firstly ODT is carried out to predict the hydrogen and air jet diffusion flame with helium dilution in the fuel. The comparison with existing experimental data was made for the numerical result of ODT simulation of jet diffusion flames in both conditional means and rms of scalars of measurements and computational results. Another application of ODT was made in present work to verify the capability of prediction of autoignition (self-ignition) of one of free shear layer flow -- jet diffusion flow. Different range of pressure and Reynolds number are set to identify the effects of turbulence intensity and mixture properties on the self-ignition chemistry. Autoignition delay time was studied based on these different conditions. At the same time the ability of the prediction of mixture temperature and species mass fraction profile were tested. A principle numerical result is expected and discussed. Conditional pdf and progress variable were used to analyze the computational result of ODT. Analysis was focus on the temperature growth and the mass fraction distribution of intermediate species and product.

A New Class of Hybrid Schemes Based on Large Eddy Simulation and Low-dimensional Stochastic Models

Author : Tarek Echekki
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis A New Class of Hybrid Schemes Based on Large Eddy Simulation and Low-dimensional Stochastic Models by : Tarek Echekki

Download or read book A New Class of Hybrid Schemes Based on Large Eddy Simulation and Low-dimensional Stochastic Models written by Tarek Echekki and published by . This book was released on 2006 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: A hybrid approach for large-eddy simulations (LES) of turbulent combustion with the One-Dimensional Turbulence (ODT) model is developed. The need for a structure-based approach can address some of the key challenges arising in the prediction of non-linear physics on the sub-grid scale. The implementation involves hybrid solutions of 3-D LES with 1-D solutions based on the ODT, with ODT elements embedded within the LES computational domain. The solutions require the coupling of LES and ODT, as well as the coupling of the different ODT 'processes'. The proposed methodology represents a fundamentally new framework to address sub-grid scale physics where statistical information cannot be represented in LES-resolved physics or cannot be assumed a priori. Numerical implementation issues are addressed, including a novel implementation of filtered advection for scalars and momentum. Validation studies based on the non-homogeneous auto-ignition show that the proposed framework and specific implementations yield excellent predictions of the physics.

A Framework for Turbulent Non-premixed Combustion Modeling in OpenFoam

Author : Vasu Jaganath
Publisher :
ISBN 13 :
Total Pages : 143 pages
Book Rating : 4.5/5 (57 download)

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Book Synopsis A Framework for Turbulent Non-premixed Combustion Modeling in OpenFoam by : Vasu Jaganath

Download or read book A Framework for Turbulent Non-premixed Combustion Modeling in OpenFoam written by Vasu Jaganath and published by . This book was released on 2020 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion remains a critical technology for electricity generation, heating, transportation and other industrial processes. Turbulent combustion lies at the heart of many of these processes. The accurate, robust and efficient computational modeling of turbulent combustion is necessary to design clean, efficient and safe combustion devices and processes. For practical combustion problems the direct numerical simulation (DNS) of the governing equations is computationally intractable. The Reynolds averaged Navier-Stokes simulation (RANS) and large eddy simulation (LES) techniques have emerged as powerful tools to simulate turbulent reacting flows. RANS and LES methodologies require closure of the unclosed terms arising from the averaging or filtering the governing equations. Even with adequate closure, RANS and LES remain computationally infeasible for simulating many combustion processes in engineering applications, further simplifications regarding flame thickness, flow and chemical reaction time scales are required. The high Damk\"{o}hler (Da) number flames can be modeled using a reduced chemistry model. A flamelet derived reduced chemistry model like Flamelet Generated Manifolds (FGM) accounts for finite rate chemistry while it greatly simplifies the simulation of turbulent combustion as it decouples the turbulent transport and flame structure. The interaction between the turbulence and the flame front in non-premixed combustion is described by the probability density function (PDF) of the composition variables. In this work, a framework for turbulent combustion modeling is presented for both RANS and, LES with FGM reduced chemistry model. This framework consists of implementation of presumed and transported PDF models and is developed within the open source CFD software OpenFOAM. The simulation of the well-known piloted methane-air jet flames (Sandia flames) is conducted in RANS context with both presumed and transported PDF models. An "A priori" analysis is conducted based on the RANS/TPDF simulation data. The analysis quantifies the extent of errors in PPDF models, specifically errors in choice of presumed PDF, statistical independence and the number moments and cross moments considered. A new PPDF model based on the Gaussian copula approach for correlation of the composition variables is developed and analyzed. The implementation of RANS/TPDF solver incorporates robust algorithms for particle tracking, position and number control. The LES/TFDF simulation of Sandia flame D is conducted to showcase the capability of the developed framework.

Study of Finite-rate Chemistry Effects on Turbulent Jet Diffusion Flames and Non-homogeneous Autoigntion Using the One-dimensional Turbulence Model

Author : Sha Zhang
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (532 download)

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Book Synopsis Study of Finite-rate Chemistry Effects on Turbulent Jet Diffusion Flames and Non-homogeneous Autoigntion Using the One-dimensional Turbulence Model by : Sha Zhang

Download or read book Study of Finite-rate Chemistry Effects on Turbulent Jet Diffusion Flames and Non-homogeneous Autoigntion Using the One-dimensional Turbulence Model written by Sha Zhang and published by . This book was released on 2003 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: autoignition, ODT, turbulent combustion.

Modelling Turbulence in Engineering and the Environment

Author : Kemal Hanjalić
Publisher : Cambridge University Press
ISBN 13 : 113985125X
Total Pages : 403 pages
Book Rating : 4.1/5 (398 download)

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Book Synopsis Modelling Turbulence in Engineering and the Environment by : Kemal Hanjalić

Download or read book Modelling Turbulence in Engineering and the Environment written by Kemal Hanjalić and published by Cambridge University Press. This book was released on 2011-10-20 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling transport and mixing by turbulence in complex flows is one of the greatest challenges for CFD. This highly readable volume introduces the reader to a level of modelling that respects the complexity of the physics of turbulent flows – second-moment closure. Following introductory chapters providing essential physical background, the book examines in detail the processes to be modelled, from fluctuating pressure interactions to diffusive transport, from turbulent time and length scales to the handling of the semi-viscous region adjacent to walls. It includes extensive examples ranging from fundamental homogeneous flows to three-dimensional industrial or environmental applications. This book is ideal for CFD users in industry and academia who seek expert guidance on the modelling options available, and for graduate students in physics, applied mathematics and engineering who wish to enter the world of turbulent flow CFD at the advanced level.

Assessment of Reduced Mechanisms Using One Dimensional Stochastic Turbulence Model

Author : Li-Chun Chien
Publisher :
ISBN 13 :
Total Pages : 408 pages
Book Rating : 4.:/5 (769 download)

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Book Synopsis Assessment of Reduced Mechanisms Using One Dimensional Stochastic Turbulence Model by : Li-Chun Chien

Download or read book Assessment of Reduced Mechanisms Using One Dimensional Stochastic Turbulence Model written by Li-Chun Chien and published by . This book was released on 2010 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reactive flow simulations involving turbulence-chemistry interaction are extremely challenging because of the strong non-linear coupling between chemistry and flow motions. Regardless the numerical method used, the chemical state is needed at each computational cell. Modeling of combustion processes with a large detailed chemistry requires tremendous computing resources making it impractical for routine engineering usage. It is becoming a common practice to use a reduced mechanism which contains only a subset of the species but still capable of capturing certain key combustion characteristics of interest such as ignition and major pollutant formation. The performances of the reduced mechanisms need to be assessed for the intended combustion regime but most test flames are of laminar nature or of zero dimensional. With a one-dimensional representation, the Linear Eddy Model (LEM) and One-Dimensional Turbulence model (ODT) are intended for simulating turbulence-chemistry interactions among all physically relevant length-scales. The detailed mathematical formulation of LEM and ODT were presented and derived. Several numerical issues involved in the Monte-Carlo method used in this work are presented and explained. Additional details on the implementation in this work are given. A standalone LEM model is used for simulating two premixed turbulent methane flames using two detailed mechanisms and six reduced mechanisms. The instantaneous consumption speed of the fuel is used for critical evaluation of the transient performances of these reduced mechanisms. Comparisons reveal that the computed flame speeds of reduced mechanisms can differ significantly in the transient turbulent flames. ODT model is used to calculate a series of non-premixed turbulent jet flames (Sandia D, E, F flames) using two detailed reaction mechanisms and three reduced mechanisms. Overall, the ODT results with the two reduced mechanisms developed from non-premixed combustion are found in close agreement with those from the detailed mechanisms. The reduced chemistry developed from lean premixed flames gives results in poor agreement with the detailed chemistry. This is somewhat expected but it points out the importance of using the reduced chemistry that is developed only for the intended flames. These comparisons demonstrate the usefulness of LEM and ODT in critical assessment of reduced chemistry for turbulent flames.

Direct Numerical Simulation for Turbulent Reacting Flows

Author : Thierry Baritaud
Publisher : Editions TECHNIP
ISBN 13 : 9782710806981
Total Pages : 328 pages
Book Rating : 4.8/5 (69 download)

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Book Synopsis Direct Numerical Simulation for Turbulent Reacting Flows by : Thierry Baritaud

Download or read book Direct Numerical Simulation for Turbulent Reacting Flows written by Thierry Baritaud and published by Editions TECHNIP. This book was released on 1996 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Description of accurate boundary conditions for the simulation of reactive flows. Parallel direct numerical simulation of turbulent reactive flow. Flame-wall interaction and heat flux modelling in turbulent channel flow. A numerical study of laminar flame wall interaction with detailed chemistry: wall temperature effects. Modeling and simulation of turbulent flame kernel evolution. Experimental and theoretical analysis of flame surface density modelling for premixed turbulent combustion. Gradient and counter-gradient transport in turbulent premixed flames. Direct numerical simulation of turbulent flames with complex chemical kinetics. Effects of curvature and unsteadiness in diffusion flames. Implications for turbulent diffusion combustion. Numerical simulations of autoignition in turbulent mixing flows. Stabilization processes of diffusion flames. References.

Flamelet Model Application for Non-Premixed Turbulent Combustion

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781731360588
Total Pages : 160 pages
Book Rating : 4.3/5 (65 download)

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Book Synopsis Flamelet Model Application for Non-Premixed Turbulent Combustion by : National Aeronautics and Space Adm Nasa

Download or read book Flamelet Model Application for Non-Premixed Turbulent Combustion written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-18 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current Final Report contains results of the study which was performed in Scientific Research Center 'ECOLEN' (Moscow, Russia). The study concerns the development and verification of non-expensive approach for modeling of supersonic turbulent diffusion flames based on flamelet consideration of the chemistry/turbulence interaction (FL approach). Research work included: development of the approach and CFD tests of the flamelet model for supersonic jet flames; development of the simplified procedure for solution of the flamelet equations based on partial equilibrium chemistry assumption; study of the flame ignition/extinction predictions provided by flamelet model. The performed investigation demonstrated that FL approach allowed to describe satisfactory main features of supersonic H 2/air jet flames. Model demonstrated also high capabilities for reduction of the computational expenses in CFD modeling of the supersonic flames taking into account detailed oxidation chemistry. However, some disadvantages and restrictions of the existing version of approach were found in this study. They were: (1) inaccuracy in predictions of the passive scalar statistics by our turbulence model for one of the considered test cases; and (2) applicability of the available version of the flamelet model to flames without large ignition delay distance only. Based on the results of the performed investigation, we formulated and submitted to the National Aeronautics and Space Administration our Project Proposal for the next step research directed toward further improvement of the FL approach. Secundov, A. and Bezgin, L. and Buriko, Yu. and Guskov, O. and Kopchenov, V. and Laskin, I. and Lomkov, K. and Tshepin, S. and Volkov, D. and Zaitsev, S. TURBULENT COMBUSTION; TURBULENT DIFFUSION; DIFFUSION FLAMES; SUPERSONIC JET FLOW; COMPUTATIONAL FLUID DYNAMICS; TURBULENCE MODELS; CHEMICAL REACTIONS; IGNITION; EXTINCTION; GAS MIXTURES; AIR JETS; OXIDATION; DIFFERENTIAL EQUATIONS; MATHEMATICAL MODEL...