Phase Resolved Characterization Of Conical Turbulent Premixed Flames
DOWNLOAD
Download Phase Resolved Characterization Of Conical Turbulent Premixed Flames PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Phase Resolved Characterization Of Conical Turbulent Premixed Flames book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Phase Resolved Characterization Of Conical Turbulent Premixed Flames
DOWNLOAD
Author : Sayan Biswas
language : en
Publisher:
Release Date : 2012
Phase Resolved Characterization Of Conical Turbulent Premixed Flames written by Sayan Biswas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Experimental Study Of Turbulent Premixed Combustion In V Shaped Flames
DOWNLOAD
Author : Sina Kheirkhah
language : en
Publisher:
Release Date : 2016
Experimental Study Of Turbulent Premixed Combustion In V Shaped Flames written by Sina Kheirkhah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Characteristics of turbulent premixed flames were investigated experimentally. The investigations were performed using Mie scattering, Particle Image Velocimetry, Rayleigh scattering, and broad-band luminosity imaging techniques. Methane-air flames associated with a relatively wide range of turbulence intensities, fuel-air equivalence ratios, and mean bulk flow velocities were investigated. For a relatively moderate value of turbulence intensity, a new concept is introduced and utilized to provide a detailed description associated with interaction of turbulent flow and flame front. The concept pertains to reactants velocity estimated at the vicinity of the flame front and is referred to as the edge velocity. Specifically, it is shown that fluctuations of the flame front position are induced by fluctuations of the edge velocity. For a relatively wide range of turbulence intensity, several characteristics of turbulent premixed flames, namely, front topology, brush thickness, surface density, and consumption speeds are investigated. For the first time, several flame front structures are identified and studied. It is shown that, due to formation of these front structures, the regime of turbulent premixed combustion transitions from the regime of counter-gradient diffusion to that of the gradient diffusion. In addition to these, a comprehensive study is performed to investigate influence of flame configuration on several flame front characteristics. It is obtained that, although changing the flame configuration influences several flame characteristics, the trends associated with the effects of governing parameters on the characteristics are nearly independent of the flame configuration.
Fundamentals Of Turbulent And Multiphase Combustion
DOWNLOAD
Author : Kenneth Kuan-yun Kuo
language : en
Publisher: John Wiley & Sons
Release Date : 2012-07-03
Fundamentals Of Turbulent And Multiphase Combustion written by Kenneth Kuan-yun Kuo and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-07-03 with Science categories.
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.
Propagation Characteristics Of Turbulent Premixed Flames In Nearly Isotropic Turbulent Flows
DOWNLOAD
Author : Sang-Jun Lee
language : en
Publisher:
Release Date : 2003
Propagation Characteristics Of Turbulent Premixed Flames In Nearly Isotropic Turbulent Flows written by Sang-Jun Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Combustion categories.
Turbulent Premixed Flames
DOWNLOAD
Author : Nedunchezhian Swaminathan
language : en
Publisher: Cambridge University Press
Release Date : 2011-04-25
Turbulent Premixed Flames written by Nedunchezhian Swaminathan and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-04-25 with Technology & Engineering categories.
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.
Thermoacoustic Combustion Instability Control
DOWNLOAD
Author : Dan Zhao
language : en
Publisher: Academic Press
Release Date : 2023-02-13
Thermoacoustic Combustion Instability Control written by Dan Zhao and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-02-13 with Technology & Engineering categories.
Thermoacoustic Combustion Instability Control: Engineering Applications and Computer Codes provides a unique opportunity for researchers, students and engineers to access recent developments from technical, theoretical and engineering perspectives. The book is a compendium of the most recent advances in theoretical and computational modeling and the thermoacoustic instability phenomena associated with multi-dimensional computing methods and recent developments in signal-processing techniques. These include, but are not restricted to a real-time observer, proper orthogonal decomposition (POD), dynamic mode decomposition, Galerkin expansion, empirical mode decomposition, the Lattice Boltzmann method, and associated numerical and analytical approaches. The fundamental physics of thermoacoustic instability occurs in both macro- and micro-scale combustors. Practical methods for alleviating common problems are presented in the book with an analytical approach to arm readers with the tools they need to apply in their own industrial or research setting. Readers will benefit from practicing the worked examples and the training provided on computer coding for combustion technology to achieve useful results and simulations that advance their knowledge and research. Focuses on applications of theoretical and numerical modes with computer codes relevant to combustion technology Includes the most recent modeling and analytical developments motivated by empirical experimental observations in a highly visual way Provides self-contained chapters that include a comprehensive, introductory section that ensures any readers new to this topic are equipped with required technical terms
Blow Off Characteristics Of Conical Premixed Flames Subjected To Upstream Velocity Modulations
DOWNLOAD
Author : Andres Arturo Chaparro
language : en
Publisher:
Release Date : 2004
Blow Off Characteristics Of Conical Premixed Flames Subjected To Upstream Velocity Modulations written by Andres Arturo Chaparro and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Micro Mixing In Turbulent Premixed Flames
DOWNLOAD
Author : Michael Joseph Kuron
language : en
Publisher:
Release Date : 2016
Micro Mixing In Turbulent Premixed Flames written by Michael Joseph Kuron and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Electronic dissertations categories.
Accurate turbulent combustion models are key to establishing a predictive capability for combustion simulations at the device level. The transported probability density function (TPDF) methods provide an elegant solution to the challenge of closing the mean chemical source term in turbulent combustion modelling as it appears in closed form in the TPDF equations and thus the turbulence-chemistry interaction can be solved for without aggressive assumptions. This is crucial for predicting low temperature combustion, turbulent flames with the presence of local limit phenomena, and pollutant emissions. Despite some reported success in the literature, challenges remain when applying the TPDF method to turbulent premixed flames as the molecular mixing or micro-mixing term is unclosed, the modeling of which is considered to be a primary challenge. The objective of this dissertation is to evaluate the application of existing mixing models to turbulent premixed flames and to create high-fidelity scalar dissipation rate models to predict turbulent premixed combustion. In this dissertation, direct numerical simulation (DNS) data is utilized at each stage to obtain statistical information on the scalar dissipation rate and mixing timescales for turbulent premixed flames. In the first step, DNS of a temporally evolving premixed flame is used as a numerical test bed to evaluate commonly used mixing models in the context of turbulent premixed flames. This study demonstrates that the Euclidean Minimum Spanning Tree (EMST) model is capable of predicting the behavior of a turbulent premixed flame assuming that an accurate model for the scalar mixing rate, and thus the scalar dissipation rate, can be provided. In the next stage of the dissertation, chemical explosive mode analysis (CEMA) and DNS data with realistic chemistry are used to identify physiochemical processes that govern the conditional scalar dissipation rate behavior in a turbulent premixed flame and evaluate mixing timescales. A local Damköhler number is defined based on the CEMA results and four flame zones are identified. It is found that large fluctuations in the instantaneous scalar dissipation rate occur in the explosive zone, where the local Damköhler number is much larger than unity. Two mechanisms are identified to account for the large degree of scatter in the explosive zone: flame-flame interactions and flame-assisted ignition. A model for the Favre-averaged scalar dissipation rate is subsequently developed based on the insight gleaned from the DNS analysis. The new hybrid mixing rate model is developed to account for the scalar mixing rate behavior in both the turbulent mixing limit and the flamelet limit. The new hybrid timescale model is notable for its treatment of the flamelet mixing limit, an area where existing timescale models do not properly recover the correct mixing behavior. Comparisons to the DNS are performed with both a priori and a postereori comparisons, with the new hybrid model performing exceptionally well. Finally, in the last stage of the dissertation, a transport equation for the conditional scalar dissipation rate of a reactive scalar is derived and an order of magnitude analysis is performed to evaluate the importance of each term in the governing equation. The order of magnitude analysis is verified with the DNS data of turbulent premixed flames and an equation of the leading order terms is identified. Models for the unclosed terms in the leading order equation are developed and evaluated with DNS data, and a modelled equation for the conditional scalar dissipation rate is proposed. The modelled equation is then compared to the DNS data, and excellent agreement between the new model and the DNS is observed.
Numerical Study Of The Characteristics Of Turbulent Premixed Flames
DOWNLOAD
Author : Mohamed Elshimy
language : en
Publisher:
Release Date : 2021
Numerical Study Of The Characteristics Of Turbulent Premixed Flames written by Mohamed Elshimy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
The Dynamics And Structure Of Turbulent Premixed Flames
DOWNLOAD
Author : Cal Rising
language : en
Publisher:
Release Date : 2021
The Dynamics And Structure Of Turbulent Premixed Flames written by Cal Rising and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Modern propulsion and power generation technology operates under highly turbulent conditions to promote increased efficiency. The coupled relationship between the turbulence conditions and imposed pressure gradients on reacting flow dynamics are explored by decomposing the vorticity transport terms to quantify the vorticity budgets under varying conditions. This is performed on a bluff-body reacting flow-field by utilizing the two-dimensional diagnostics of particle image velocimetry (PIV) and CH* chemiluminescence to allow for a resolved velocity field and flame front. The vorticity budget is determined by utilizing a mean conditional fluid element tracking procedure to quantify the evolution of the individual vorticity terms through the flame front.