Download or read book Numerical Simulation of Tangential Flow Flameless Combustion Process written by Ehsan Hamidi and published by . This book was released on 2014 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Numerical Simulation of Combustion Phenomena written by R. Glowinski and published by Springer. This book was released on 1985 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Numerical Approaches to Combustion Modeling written by Elaine S. Oran and published by AIAA (American Institute of Aeronautics & Astronautics). This book was released on 1991 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Combustion written by Alain Dervieux and published by . This book was released on 1989 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in numerical combustion is growing among applied mathematicians, physicists, chemists, engine manufacturers and many industrialists. This proceedings volume contains nine invited lectures and twenty seven contributions carefully selected by the editors. The major themes are numerical simulation of transsonic and supersonic combustion phenomena, the study of supersonic reacting mixing layers, and turbulent combustion. Emphasis is laid on hyperbolic models and on numerical simulations of hydrocarbon planes with a complete set of chemical reactions carried out in two-dimensional geometries as well as on complex reactive flow simulations.

Download or read book Non premixed Combustion Full Numerical Simulation of a Coflowing Axisymmetric Jet Inviscid and Viscous Stability Analysis written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1989 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of 2D Combustion Flows with the CE SE Method written by Yanhu Guo and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experiments and Numerical Simulations of Turbulent Combustion of Diluted Sprays written by Bart Merci and published by Springer Science & Business Media. This book was released on 2014-03-27 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reflects the results of the 2nd and 3rd International Workshops on Turbulent Spray Combustion. The focus is on progress in experiments and numerical simulations for two-phase flows, with emphasis on spray combustion. Knowledge of the dominant phenomena and their interactions allows development of predictive models and their use in combustor and gas turbine design. Experts and young researchers present the state-of-the-art results, report on the latest developments and exchange ideas in the areas of experiments, modelling and simulation of reactive multiphase flows. The first chapter reflects on flame structure, auto-ignition and atomization with reference to well-characterized burners, to be implemented by modellers with relative ease. The second chapter presents an overview of first simulation results on target test cases, developed at the occasion of the 1st International Workshop on Turbulent Spray Combustion. In the third chapter, evaporation rate modelling aspects are covered, while the fourth chapter deals with evaporation effects in the context of flamelet models. In chapter five, LES simulation results are discussed for variable fuel and mass loading. The final chapter discusses PDF modelling of turbulent spray combustion. In short, the contributions in this book are highly valuable for the research community in this field, providing in-depth insight into some of the many aspects of dilute turbulent spray combustion.

Download or read book Numerical Simulation of Turbulent Flames Using Vortex Methods written by Ahmed F. Ghoniem and published by . This book was released on 1985 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research is to develop vortex methods for numerical simulation of multi-dimensional, time-dependent turbulent chemically-reacting flows with high temporal and spatial accuracy. Of particular interest is turbulent shear flows associated with the propagation of turbulent flames in combustion systems. Vortex methods are developed and incorporated in a numerical simulations of turbulent reacting flow, and applied to study the propagation and stability of turbulent flames in different geometrical configurations. At high Damkohler number, a dynamic thin flame model is used, while for slower reactions, the vortex scheme is extended to solve the energy and species equations with finite rate chemical reaction in a Lagrangian particle form. Results have been obtained for a confined mixing layer, a recirculating flow over a rearward facing step, and a confined shallow cavity. Detailed analyses have been performed to validate the numerical schemes and to study the structure and stability of these flows. The scheme has been extended to three dimension flow and an investigation of the transition to turbulence in an axisymmetric shear layer has been initiated. Currently, the combustion algorithms. Are being linked to the vortex simulation to predict the interaction between the turbulent field and the burning process. Keywords: Turbulent combustion.

Download or read book Fundamentals of Low Emission Flameless Combustion and Its Applications written by Seyed Ehsan Hosseini and published by Academic Press. This book was released on 2022-07-30 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Low Emission Flameless Combustion and Its Applications is a comprehensive reference on the flameless combustion mode and its industrial applications, considering various types of fossil and alternative fuel. Several experimental and numerical accomplishments on the fundamentals of state-of-the-art flameless combustion is presented, working to clarify the environmentally friendly aspects of this combustion mode. Author Dr. Hosseini presents the latest progresses in the field and highlights the most important achievements since invention, including the fundamentals of thermodynamics, heat transfer and chemical kinetics. Also analyzed is fuel consumption reduction and the efficiency of the system, emissions formation and the effect of the flameless mode on emission reduction.This book provides a solid foundation for those in industry employing flameless combustion for energy conservation and the mitigation of pollutant emissions. It will provide engineers and researchers in energy system engineering, chemical engineering, industrial engineers and environmental engineering with a reliable resource on flameless combustion and may also serve as a textbook for senior graduate students. - Presents the fundamentals of flameless combustion and covers advances since its invention - Includes experimental and numerical investigations of flameless combustion - Analyzes emission formation and highlights the effects of the flameless mode on emission reduction

Download or read book Detailed and Reduced Kinetic Mechanisms in Low Emission Combustion Processes written by Sylvie Honnet and published by Cuvillier Verlag. This book was released on 2007-10-11 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this work is the application of the Representative Interactive Flamelet (RIF) model with detailed and reduced kinetics to describe the combustion processes with low-emission. Chemical kinetic reaction mechanisms are developed. Regarding the application of these mechanisms in the numerical simulation of combustion processes, the description of the formation of nitrous oxide is particularly taken into account. After the introduction in the topic, chapter 2 presents the conservation equations and the description of the turbulent flow and mixing field. The flamelet model and the RIF-concept are described: the chemical reaction kinetics is separately considered from the flow dynamics. This is possible due to the assumption of the existence of a very thin flame layer, in which the chemical processes take place. This flame layer, also considered as laminar in turbulent flows, is called flamelet. The calculation of the ignition, heat release and formation of nitrogen oxide with detailed kinetics is then possible. In chapter 3, a model for the calculation of three-dimensional combustion processes is presented. It is based on the flamelet model. To describe the formation of nitrous oxide, the consideration of the combustion as an unsteady process is very important. This is possible thanks to the use of unsteady flamelets. The flamelets are calculated interactive with the flow solver, each representative for a pathway of particle through the combustion chamber. The statistical way of fluid particle through the combustion chamber is described by the eulerian transport equations. In chapter 4, a chemical reaction mechanism is developed and validated with comparison with experimental results. Special attention is paid to the methane mechanism with consideration of nitrous oxide formation. This mechanism is reduced with steady-state assumptions. Furthermore, a pyrolysis and burnout model are presented, which are used for the simulation of the coal combustion in chapter 5. In chapter 5, simulation results for two different configurations are compared to experimental data. In the MILD combustion chamber, the formation of nitrous oxide is investigated with the use of the detailed and reduced kinetics presented in chapter 4. The Eulerian Particle Flamelet model is completed and used for the simulation of the gaseous phase during the coal combustion. Based on the results, it is shown that the flamelet model, coupled with the detailed and the reduced kinetics, is able to model low-emission combustion processes.

Download or read book Numerical Simulation of the Turbulent Combustion Process in a Rapid Compression Device written by U. Bielert and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Numerical Simulation of Spray Combustion Using Bio mass Derived Liquid Fuels written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this work is to create a robust model for two-phase liquid spray combustion flow using vegetable oils, to investigate the flow structure generated by a swirler array with different fuels, and secondly to assess and optimise the capability of the CFD to predict accurately the results obtained experimentally and eventually enhance CFD model development and simulation. Validation is achieved by comparing the numerical results obtained with CFD with the experimental measurements. The purpose of this research is to increase the scientific understanding of the fundamental mechanisms of the spray combustion process using a carbon neutral fuel such as ethanol and biodiesel. In fact, very few numerical simulations of liquid biomass fuels in gas turbine systems are available in the literature. The flames are simulated using the commercial code FLUENT. The combustion/turbulence interaction is modelled using the laminar flamelet approach with detailed chemistry modelled using the OPPDIFF model from CHEMKIN. While the experiments could be carried out only up to 3 atm, the simulations were further extended to a maximum pressure of 10 atm. The FLUENT results were assessed qualitatively and quantitatively between the experimental measurements and the simulation. The cold flow features have been captured by the present simulations with a good degree of accuracy. Effect of air preheating was investigated for the biodiesel, and sensitivity to droplet size and spray angles variation were analysed. Good agreement was obtained for ethanol except in the fuel lean region due to failure of the FLUENT laminar flamelet model to capture local flame extinction while biodiesel simulation resulted in a significant overprediction of the flame temperature especially in the downstream region and satisfactory results further upstream. The results show the importance of setting proper droplet initial conditions, since it will significantly affect the structure of the flame.

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.

Download or read book Theory and Numerical Modeling of Turbulent Gas Particle Flows and Combustion written by Lixing Zhou and published by CRC Press. This book was released on 1993-10-26 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a theoretical treatment of basic combustion phenomena in laminar and gas-particle flows, the numerical modeling theory, methods of turbulent single-phase gas particle flows, and combustion. Topics discussed include basic conservation equations of reacting fluids, ignition and extinction, laminar premixed combustion, droplet and particle combustion, combustion in laminar boundary layers, fundamentals of gas-particle flows, numerical modeling of single-phase turbulent flows, turbulent gas-particle flows, and turbulent gas-phase and two-phase combustion. Typical examples of applications of the theory and methods in complex flow and combustion processes in practical engineering facilities such as cyclone separaters, gas-turbine combusters, furnaces, and fluidized beds are provided. This volume also presents experimental results and assessments in comparisons between different models. Theory and Numerical Modeling of Turbulent Gas-Particle Flows and Combustion is an excellent book for researchers, designers, instructors, and students interested in this field.