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Verification And Improvement Of Flamelet Approach For Non Premixed Flames
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723483301 Total Pages :132 pages Book Rating :4.4/5 (833 download)
Book Synopsis Verification and Improvement of Flamelet Approach for Non-Premixed Flames by : National Aeronautics and Space Administration (NASA)
Download or read book Verification and Improvement of Flamelet Approach for Non-Premixed Flames written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies in the mathematical modeling of the high-speed turbulent combustion has received renewal attention in the recent years. The review of fundamentals, approaches and extensive bibliography was presented by Bray, Libbi and Williams. In order to obtain accurate predictions for turbulent combustible flows, the effects of turbulent fluctuations on the chemical source terms should be taken into account. The averaging of chemical source terms requires to utilize probability density function (PDF) model. There are two main approaches which are dominant in high-speed combustion modeling now. In the first approach, PDF form is assumed based on intuitia of modelliers (see, for example, Spiegler et.al.; Girimaji; Baurle et.al.). The second way is much more elaborate and it is based on the solution of evolution equation for PDF. This approach was proposed by S.Pope for incompressible flames. Recently, it was modified for modeling of compressible flames in studies of Farschi; Hsu; Hsu, Raji, Norris; Eifer, Kollman. But its realization in CFD is extremely expensive in computations due to large multidimensionality of PDF evolution equation (Baurle, Hsu, Hassan). Zaitsev, S. and Buriko, Yu. and Guskov, O. and Kopchenov, V. and Lubimov, D. and Tshepin, S. and Volkov, D. Glenn Research Center TURBULENT COMBUSTION; MATHEMATICAL MODELS; HIGH SPEED; TURBULENT FLOW; COMBUSTION CHEMISTRY; COMPUTATIONAL FLUID DYNAMICS; REACTION KINETICS; COMBUSTION; BIBLIOGRAPHIES; PREMIXED FLAMES...
Book Synopsis Analytical Validation of Flamelet-Based Models for Non-Premixed Turbulent Combustion by :
Download or read book Analytical Validation of Flamelet-Based Models for Non-Premixed Turbulent Combustion written by and published by . This book was released on 2001 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the project was to validate various implementations of the flamelet approach to turbulent combustion modeling, in particular in the context of large eddy simulations of turbulent flames. A hybrid mathematical-numerical-asymptotic approach has been used by Bourlioux and her students, in collaboration with Majda, to systematically exploit Majda and co-workers theoretical results in an applied computational framework. The idealized models utilized in the project were amenable to rigorous asymptotic predictions regarding the effective behavior of turbulent flames at large scales in terms of their effective burning rate. New numerical tools were designed to carry on the asymptotic procedures for relevant test-cases. A strong emphasis was placed on providing the physical intuition behind the various turbulent regimes identified by the theory. The asymptotic predictions were compared with ad-hoc modeling procedures to identify their pros and cons. Additionally, direct numerical simulations were carried on for the idealized test-cases to provide practitioners with some intuition regarding the relationship between the theoretical asymptotic limit results and finite parameters realizations.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723057441 Total Pages :158 pages Book Rating :4.0/5 (574 download)
Book Synopsis Flamelet Model Application for Non-Premixed Turbulent Combustion by : National Aeronautics and Space Administration (NASA)
Download or read book Flamelet Model Application for Non-Premixed Turbulent Combustion written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 158 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. Unspecified Center 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; ...
Book Synopsis Assessment of the Stretched Laminar Flamelet Approach for Non-premixed Turbulent Combustion by : D. Lentini
Download or read book Assessment of the Stretched Laminar Flamelet Approach for Non-premixed Turbulent Combustion written by D. Lentini and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulation of Non-premixed Laminar and Turbulent Flames by Means of Flamelet Modelling Approaches by : Kilian Claramunt i Altimira
Download or read book Numerical Simulation of Non-premixed Laminar and Turbulent Flames by Means of Flamelet Modelling Approaches written by Kilian Claramunt i Altimira and published by . This book was released on 2005 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A New Flamelet Combustion Model Combining Premixed and Non-premixed Turbulent Flames by : D. Veynante
Download or read book A New Flamelet Combustion Model Combining Premixed and Non-premixed Turbulent Flames written by D. Veynante and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flamelet/progress-variable Modelling of Non-premixed Turbulent Combustion by : Alessandro Coclite
Download or read book Flamelet/progress-variable Modelling of Non-premixed Turbulent Combustion written by Alessandro Coclite and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A New flamelet combustion model combining premixed and non-premixed turbulent flames, AIAA 89-0487 by : D. Veynante
Download or read book A New flamelet combustion model combining premixed and non-premixed turbulent flames, AIAA 89-0487 written by D. Veynante and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tracking and Analysis of Flamelet Structures in Turbulent Non-premixed Combustion by : Felix Dietzsch
Download or read book Tracking and Analysis of Flamelet Structures in Turbulent Non-premixed Combustion written by Felix Dietzsch and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flamelet Models of Turbulent Non-premixed Combustion by : S. K. Liew
Download or read book Flamelet Models of Turbulent Non-premixed Combustion written by S. K. Liew and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Highly Turbulent Counterflow Premixed Flames in the Flamelet and Non-Flamelet Regimes. by : Bruno Coriton
Download or read book Highly Turbulent Counterflow Premixed Flames in the Flamelet and Non-Flamelet Regimes. written by Bruno Coriton and published by . This book was released on 2011-10-01 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent lean-to-stoichiometric premixed flames were experimentally studied in two counterflow configurations at turbulent Reynolds numbers as large as one thousand. The primary objectives were to examine conditions of departure from the flamelet regime, characterized by laminar-like, singly-connected turbulent flame fronts, and analyze the turbulent premixed flame structure in the non-flamelet regime, for which disrupted and locally-extinguished flame fronts are expected.The first burner configuration consisted of two highly turbulent opposed jets fed with the same fresh reactant mixtures. In that configuration, turbulent twin-premixed flames could be stabilized at turbulent Karlovitz numbers, Kat, of at most order unity. The envelope of turbulent flame regime was limited to the flamelet regime because of the inevitable annihilation of the turbulent flames by the large bulk strain rate when Kat was increased. The interaction of the turbulent flames with the coherent structures was analyzed using simultaneous PIV/OH-LIF measurements.In the second counterflow burner configuration, a turbulent stream of fresh premixed reactants was opposed to a second stream of hot products of combustion. This approach let us study the effects of heat losses and flame dilution by combustion products. These effects, which are not accounted by the current diagrams of turbulent premixed combustion, were revealed to lower the boundary of the flamelet regime significantly to Kat values of nearly unity. The structure of the oxidation layer analyzed using simultaneous CO/OH-LIF measurements was found to be sensitive to the turbulence intensity and the hot product composition. The quenching of the oxidation layer, which is not currently accounted for in turbulent combustion theory, appeared to be a critical element of departure from the flamelet regime.The interpretations of the experimental results were aided by numerical calculations of the extinction of strained laminar premixed flames using a one-dimensional arc-length continuation code with detailed chemistry and transport mechanisms. Two distinct extinction modes were observed: an abrupt one and a smooth one, the latter being favored by an excess of oxidizing species in the combustion product stream. This study provided valuable insights in the mechanisms by which premixed flames extinguish.
Book Synopsis Flamelet Modelling of Stabilization in Turbulent Non-premixed Combustion by : Jorge Ferreira
Download or read book Flamelet Modelling of Stabilization in Turbulent Non-premixed Combustion written by Jorge Ferreira and published by . This book was released on 1996 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Flamelet Modelling of Turbulent Non-premixed and Partially Premixed Combustion by : Satyanarayana M. Ravikanti Veera Venkata
Download or read book Advanced Flamelet Modelling of Turbulent Non-premixed and Partially Premixed Combustion written by Satyanarayana M. Ravikanti Veera Venkata and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Premixed Flames by : Nedunchezhian Swaminathan
Download or read book Turbulent Premixed Flames written by Nedunchezhian Swaminathan and published by Cambridge University Press. This book was released on 2011-04-25 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: A work on turbulent premixed combustion is important because of increased concern about the environmental impact of combustion and the search for new combustion concepts and technologies. An improved understanding of lean fuel turbulent premixed flames must play a central role in the fundamental science of these new concepts. Lean premixed flames have the potential to offer ultra-low emission levels, but they are notoriously susceptible to combustion oscillations. Thus, sophisticated control measures are inevitably required. The editors' intent is to set out the modeling aspects in the field of turbulent premixed combustion. Good progress has been made on this topic, and this cohesive volume contains contributions from international experts on various subtopics of the lean premixed flame problem.
Book Synopsis Modelling Heat Loss Effects in High Temperature Oxy-fuel Flames with an Efficient and Robust Non-premixed Flamelet Approach by :
Download or read book Modelling Heat Loss Effects in High Temperature Oxy-fuel Flames with an Efficient and Robust Non-premixed Flamelet Approach written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1999 with total page 1144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
