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A Multi Dimensional Flamelet Model For Ignition In Multi Feed Combustion Systems
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Book Synopsis A Multi-dimensional Flamelet Model for Ignition in Multi-feed Combustion Systems by : Eric Michael Doran
Download or read book A Multi-dimensional Flamelet Model for Ignition in Multi-feed Combustion Systems written by Eric Michael Doran and published by Stanford University. This book was released on 2011 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work develops a computational framework for modeling turbulent combustion in multi-feed systems that can be applied to internal combustion engines with multiple injections. In the first part of this work, the laminar flamelet equations are extended to two dimensions to enable the representation of a three-feed system that can be characterized by two mixture fractions. A coupling between the resulting equations and the turbulent flow field that enables the use of this method in unsteady simulations is then introduced. Models are developed to describe the scalar dissipation rates of each mixture fraction, which are the parameters that determine the influence of turbulent mixing on the flame structure. Furthermore, a new understanding of the function of the joint dissipation rate of both mixture fractions is discussed. Next, the extended flamelet equations are validated using Direct Numerical Simulations (DNS) of multi-stream ignition that employ detailed finite-rate chemistry. The results demonstrate that the ignition of the overall mixture is influenced by heat and mass transfer between the fuel streams and that this interaction is manifested as a front propagation in two-dimensional mixture fraction space. The flamelet model is shown to capture this behavior well and is therefore able to accurately describe the ignition process of each mixture. To provide closure between the flamelet chemistry and the turbulent flow field, information about the joint statistics of the two mixture fractions is required. An investigation of the joint probability density function (PDF) was carried out using DNS of two scalars mixing in stationary isotropic turbulence. It was found that available models for the joint PDF lack the ability to conserve all second-order moments necessary for an adequate description of the mixing field. A new five parameter bivariate beta distribution was therefore developed and shown to describe the joint PDF more accurately throughout the entire mixing time and for a wide range of initial conditions. Finally, the proposed model framework is applied in the simulation of a split-injection diesel engine and compared with experimental results. A range of operating points and different injection strategies are investigated. Comparisons with the experimental pressure traces show that the model is able to predict the ignition delay of each injection and the overall combustion process with good accuracy. These results indicate that the model is applicable to the range of regimes found in diesel combustion.
Book Synopsis A Multi-dimensional Flamelet Model for Ignition in Multi-feed Combustion Systems by : Eric Michael Doran
Download or read book A Multi-dimensional Flamelet Model for Ignition in Multi-feed Combustion Systems written by Eric Michael Doran and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work develops a computational framework for modeling turbulent combustion in multi-feed systems that can be applied to internal combustion engines with multiple injections. In the first part of this work, the laminar flamelet equations are extended to two dimensions to enable the representation of a three-feed system that can be characterized by two mixture fractions. A coupling between the resulting equations and the turbulent flow field that enables the use of this method in unsteady simulations is then introduced. Models are developed to describe the scalar dissipation rates of each mixture fraction, which are the parameters that determine the influence of turbulent mixing on the flame structure. Furthermore, a new understanding of the function of the joint dissipation rate of both mixture fractions is discussed. Next, the extended flamelet equations are validated using Direct Numerical Simulations (DNS) of multi-stream ignition that employ detailed finite-rate chemistry. The results demonstrate that the ignition of the overall mixture is influenced by heat and mass transfer between the fuel streams and that this interaction is manifested as a front propagation in two-dimensional mixture fraction space. The flamelet model is shown to capture this behavior well and is therefore able to accurately describe the ignition process of each mixture. To provide closure between the flamelet chemistry and the turbulent flow field, information about the joint statistics of the two mixture fractions is required. An investigation of the joint probability density function (PDF) was carried out using DNS of two scalars mixing in stationary isotropic turbulence. It was found that available models for the joint PDF lack the ability to conserve all second-order moments necessary for an adequate description of the mixing field. A new five parameter bivariate beta distribution was therefore developed and shown to describe the joint PDF more accurately throughout the entire mixing time and for a wide range of initial conditions. Finally, the proposed model framework is applied in the simulation of a split-injection diesel engine and compared with experimental results. A range of operating points and different injection strategies are investigated. Comparisons with the experimental pressure traces show that the model is able to predict the ignition delay of each injection and the overall combustion process with good accuracy. These results indicate that the model is applicable to the range of regimes found in diesel combustion.
Book Synopsis Multi-dimensional Modeling of Ignition and Combustion in Premixed and DIS/CI (direct Injection Spark/compression Ignition) Engines by : Zhichao Tan
Download or read book Multi-dimensional Modeling of Ignition and Combustion in Premixed and DIS/CI (direct Injection Spark/compression Ignition) Engines written by Zhichao Tan and published by . This book was released on 2003 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multidimensional Modeling of Ignition and Combustion in Spark-igniton Engines Based on Level-set Approach by : Guangfei Zhu
Download or read book Multidimensional Modeling of Ignition and Combustion in Spark-igniton Engines Based on Level-set Approach written by Guangfei Zhu and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An LES version ignition model, WSSIM, was developed by taking the effect of turbulence on wrinkling and stretching the flame surface into account. Next, this ignition model was combined with an innovative swept-volume algorithm based combustion model to simulate the cycle to cycle variations of ignition and combustion processes in premixed propane/air mixtures. The open source software OpenFOAM-5.0 helped to implement and validate the models.
Book Synopsis A Level Set Based Flamelet Model for the Prediction of Combustion in Homogeneous Charge and Direct Injection Spark Ignition Engines by :
Download or read book A Level Set Based Flamelet Model for the Prediction of Combustion in Homogeneous Charge and Direct Injection Spark Ignition Engines written by and published by Cuvillier Verlag. This book was released on 2006-03-01 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multi-dimensional combustion modeling of premixed turbulent flames by : Xiaowei Zhao
Download or read book Multi-dimensional combustion modeling of premixed turbulent flames written by Xiaowei Zhao and published by . This book was released on 1994 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multi-dimensional Modeling of Turbulent Premixed Charge Combustion by : Mark J. Jennings
Download or read book Multi-dimensional Modeling of Turbulent Premixed Charge Combustion written by Mark J. Jennings and published by . This book was released on 1992 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Literature Abstracts by : Society of Automotive Engineers
Download or read book Technical Literature Abstracts written by Society of Automotive Engineers and published by . This book was released on 1996 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cumulative Index [of The] SAE Papers by : Society of Automotive Engineers
Download or read book Cumulative Index [of The] SAE Papers written by Society of Automotive Engineers and published by . This book was released on 1965 with total page 1646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1995 with total page 638 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.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Fluid Dynamics '94 by : Siegfried Wagner
Download or read book Computational Fluid Dynamics '94 written by Siegfried Wagner and published by . This book was released on 1994 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Engineering Progress written by and published by . This book was released on 2007 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1994 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Numerical Combustion by : Thierry Poinsot
Download or read book Theoretical and Numerical Combustion written by Thierry Poinsot and published by R.T. Edwards, Inc.. This book was released on 2005 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introducing numerical techniques for combustion, this textbook describes both laminar and turbulent flames, addresses the problem of flame-wall interaction, and presents a series of theoretical tools used to study the coupling phenomena between combustion and acoustics. The second edition incorporates recent advances in unsteady simulation methods,
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