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Dissertations / Theses on the topic 'Turbulent combustion'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Ahmed, Umair. "Flame turbulence interaction in premixed turbulent combustion." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/flame-turbulence-interaction-in-premixed-turbulent-combustion(f23c7263-df3d-41fa-90ed-41735fcaa34a).html.

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2

Gete, Zenebe. "et-enhanced turbulent combustion." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29969.

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A study of the squish-jet design concept in spark ignition engines, with central ignition, was conducted in a constant volume chamber. The effects of jet size, jet number and jet orientation in generating turbulence and jet enhanced turbulent combustion were investigated. Three sets of configurations with three port sizes were used in this study. The research was carried out in three stages: 1.Qualitative information was obtained from flow visualization experiments via schlieren photography at 1000 frames per second. The flow medium was air. A sequence of frames at specific time intervals wer

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3

Louch, Derek Stanley. "Vorticity and turbulent transport in premixed turbulent combustion." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.625005.

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4

Nathani, Arun. "A turbulent combustion noise model." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/43102.

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A turbulent combustion noise model based on first principles is developed in this thesis. The model predicts (1) the pressure time series, (2) Sound Pressure Level (SPL) spectrum, (3) Over-All Sound Pressure Level (OASPL), (4) the thermoacoustic efficiency, (5) the peak frequency, and (6) the sound power of combustion generated noise. In addition, a correlation for sound power is developed based on fundamental burner and fuel variables known to affect the acoustic characteristics of turbulent combustion. The predicted pressure time series exhibits consistency with reality in that it has

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5

Schmidt, Wolfram. "Turbulent thermonuclear combustion in degenerate stars." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970936532.

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6

Mastorakos, Epaminondas. "Turbulent combustion in opposed jet flows." Thesis, Imperial College London, 1994. http://hdl.handle.net/10044/1/11820.

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7

Kostiuk, Larry William. "Premixed turbulent combustion in counterflowing streams." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305530.

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8

YAMAMOTO, Kazuhiro, Satoshi INOUE, Hiroshi YAMASHITA, Daisuke SHIMOKURI, and Satoru ISHIZUKA. "Flow Field of Turbulent Premixed Combustion in a Cyclone-Jet Combustor." The Japan Society of Mechanical Engineers, 2007. http://hdl.handle.net/2237/9384.

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9

Hawkes, Evatt Robert. "Large eddy simulation of premixed turbulent combustion." Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/251761.

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10

Pater, Sjoerd Gerardus Maria. "Acoustics of turbulent non-premixed syngas combustion." Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/58039.

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11

Shimada, Yosuke. "Computational science of turbulent mixing and combustion." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/5552.

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Implicit Large Eddy Simulation (ILES) with high-resolution and high-order computational modelling has been applied to flows with turbulent mixing and combustion. Due to the turbulent nature, mixing of fuel and air and the subsequent combustion still remain challenging for computational fluid dynamics. However, recently ILES, an advanced numerical approach in Large Eddy Simulation methods, has shown encouraging results in prediction of turbulent flows. In this thesis the governing equations for single phase compressible flow were solved with an ILES approach using a finite volume Godunov-type m

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12

Emami, Mohsen Davazdah. "Prediction of finite rate chemistry turbulent combustion." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325311.

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13

Hossain, Mamdud. "CFD modelling of turbulent non-premixed combustion." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/12230.

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The thesis comprises of a thorough assessment of turbulent non-premixed combustion modelling techniques, emphasising the fundamental issue of turbulence-chemistry interaction. The combustion models studied are the flame-sheet, equilibrium, eddy breakup and laminar flamelet models. An in-house CFD code is developed and all the combustion models are implemented. Fundamental numerical issues involving the discretisation schemes are addressed by employing three discretisation schemes namely, hybrid, power law and TVD. The combustion models are evaluated for a number of fuels ranging from simple H2

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14

Armstrong, Neil William Hannah. "Planar flowfield measurements in premixed turbulent combustion." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317749.

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15

Matheson, Tomas. "Presumed pdf modelling for turbulent spray combustion." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/413770/.

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16

Jain, Abhishek. "Modeling of turbulent mixing in combustion LES." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1502969701311144.

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17

De, Bruyn Kops Stephen M. "Numerical simulation of non-premixed turbulent combustion /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/7140.

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18

Ranasinghe, D. J. "Modelling partially premixed turbulent combustion in a spark ignited internal combustion engine." Thesis, University of Cambridge, 2000. https://www.repository.cam.ac.uk/handle/1810/272095.

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19

Chakravarthy, Veerathu Kalyana. "Stochastic subgrid modeling of turbulent premixed flames." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/12934.

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20

Mameri, Abdelbaki. "Etude numérique de la combustion turbulente du prémélange pauvre méthane/air enrichi à l'hydrogène." Phd thesis, Université d'Orléans, 2009. http://tel.archives-ouvertes.fr/tel-00505246.

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L'enrichissement des hydrocarbures par l'hydrogène permet d'améliorer les performances de la combustion pauvre (augmentation de la réactivité, résistance à l'étirement, stabilité, réduction des polluants, ...). Il est primordial de connaitre les caractéristiques de la combustion de ces combustibles hybrides dans différentes conditions, afin de pouvoir les utiliser d'une manière sûre et efficace dans les installations pratiques. L'approche expérimentale reste coûteuse et limitée à certaines conditions opératoires. Cependant, le calcul numérique peut constituer la solution la plus adaptée, compt

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21

Barsanti, Patricia Sylvia. "Simulations of confined turbulent explosions." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261538.

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22

山本, 和弘, Kazuhiro YAMAMOTO, 朝士阿知波, Tomoshi ACHIHA, 義昭小沼 та Yoshiaki ONUMA. "旋回噴流燃焼器を用いた強乱流予混合火炎の研究 (第2報, 静電探針を用いた火炎の微細構造の検討)". 日本機械学会, 2000. http://hdl.handle.net/2237/9341.

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23

Minamoto, Yuki. "Physical aspects and modelling of turbulent MILD combustion." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245204.

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Moderate or Intense Low-oxygen Dilution (MILD) combustion is one of combustion technologies which can improve efficiency and reduce emissions simultaneously. This combustion type is characterised by the highly preheated reactant temperature and the relatively small temperature rise during combustion due to the intense dilution of the reactant mixture. These unique combustion conditions give MILD combustion very attractive features such as high combustion efficiency, reduction of pollutant emissions, attenuation of combustion instabilities and flexibility of the flow field. However, our underst

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24

Jager, Bram de. "Combustion and noise phenomena in turbulent alkane flames." Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/58022.

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25

Odedra, Anand. "Unsteady flamelet modelling of turbulent non-premixed combustion." Thesis, Loughborough University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497217.

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In this study, RANS based axisymmetric simulations of the jet flames, bluff-body flames and swirling flames have been attempted by employing steady and unsteady flamelet models. The jet flames have been studied for pure hydrogen and diluted hydrogen (CO/H2/N2) fuels. The bluff-body flames have been studied for three different fuels CH4/H2, H2/CO and CH3OH. The swirling flame has been investigated for CH4/H2 fuel. The importance of unsteady effects is thoroughly assessed for combustion predictions. The transient effects are considered in a post-processing manner employing the Lagrangian Flamele

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26

Lysenko, Dmitry. "On Numerical Simulation of Turbulent Flows and Combustion." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24233.

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The goal of the present doctoral thesis was to develop a turbulence-chemistry interaction model for turbulent combustion simulations for high Reynolds number flows of practical interest. Present simulations were carried out using the unsteady Reynolds-averaged Navier-Stokes (URANS) and the Large Eddy Simulation (LES) formulations. The compressible flow treatment was used for both cases in order to model the coupling between hydromechanics and thermodynamics. The transient Navier-Stokes equations were applied to catch up unsteady combustion physics properly. The interaction between turbulence a

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27

Amato, Alberto. "Leading points concepts in turbulent premixed combustion modeling." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52247.

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The propagation of premixed flames in turbulent flows is a problem of wide physical and technological interest, with a significant literature on their propagation speed and front topology. While certain scalings and parametric dependencies are well understood, a variety of problems remain. One major challenge, and focus of this thesis, is to model the influence of fuel/oxidizer composition on turbulent burning rates. Classical explanations for augmentation of turbulent burning rates by turbulent velocity fluctuations rely on global arguments - i.e., the turbulent burning velocity increase is d

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28

Alim, Md Abdul. "CFD modelling of turbulent combustion and heat transfer." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/7639.

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This thesis is concerned with the development and implementation of computational fluid dynamics (CFD) based prediction methodologies for turbulent reacting flows with principal application to turbulent diffusion flame combustors. Numerical simulation of combustion problems involve strong coupling between chemistry, transport and fluid dynamics. The works accomplished in this study can be separated mainly into three distinct areas: i) assessment of the performance of turbulent combustion models and to implement suitable submodels for combustion and flame behaviour into CFD code; ii) Conducting

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29

Wu, Ar-Shiang. "Aspects of premixed turbulent combustion in stagnating flows." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363191.

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30

Abhishek, Lakshman Pillai. "Numerical Investigation of Combustion Noise of Turbulent Flames." Kyoto University, 2018. http://hdl.handle.net/2433/232033.

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31

Kim, Ik Soo. "Conditional moment closure for non-premixed turbulent combustion." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614939.

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32

Prasad, Vinayaka Nakul. "Large eddy simulation of partially premixed turbulent combustion." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/11871.

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33

Sripakagorn, Paiboon. "Local extinction and reignition in turbulent nonpremixed combustion /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/7043.

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34

Dunn, Matthew John. "Finite-Rate Chemistry Effects in Turbulent Premixed Combustion." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/5782.

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In recent times significant public attention has been drawn to the topic of combustion. This has been due to the fact that combustion is the underlying mechanism of several key challenges to modern society: climate change, energy security (finite reserves of fossil fuels) and air pollution. The further development of combustion science is undoubtedly necessary to find improved solutions to manage these combustion science related challenges in the near and long term future. Combustion is essentially an exothermic process, this exothermicity or heat release essentially occurs at small scales, by

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35

Dunn, Matthew John. "Finite-Rate Chemistry Effects in Turbulent Premixed Combustion." University of Sydney, 2008. http://hdl.handle.net/2123/5782.

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Doctor of Philosophy (PhD)<br>In recent times significant public attention has been drawn to the topic of combustion. This has been due to the fact that combustion is the underlying mechanism of several key challenges to modern society: climate change, energy security (finite reserves of fossil fuels) and air pollution. The further development of combustion science is undoubtedly necessary to find improved solutions to manage these combustion science related challenges in the near and long term future. Combustion is essentially an exothermic process, this exothermicity or heat release essentia

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36

Zhang, K. "Turbulent combustion simulation in realistic gas-turbine combustors." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/17689/.

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The work presented in this thesis addresses issues involving the accurate and efficient numerical modelling of turbulence combustion with an emphasis on an industrially representative Tay model combustor. This combustor retained all essential features of a modern aero-engine rich burn combustor and thus the turbulence combustion within this combustor is much more complicated than those observed in the combustor-like burners typically considered in laboratory experiments. A comparative study of two combustion models based on a non-premixed assumption or a partially premixed assumption using the

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37

Sainte-Rose, Bruno. "Simulations numériques d'écoulements réactifs massivement décollés par une approche hybride RANS/LES." Phd thesis, Ecole Centrale Paris, 2010. http://tel.archives-ouvertes.fr/tel-00635538.

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Les premières simulations numériques d'écoulements réactifs sur des configurationscomplexes ont été réalisées à l'aide d'approches RANS (Reynolds Averaged Navier Stokes). Ces dernières, bien adaptées aux écoulements de type couches limites attachées et relativement peu coûteuses en temps de calcul, ne donnent accès qu'à des résultats stationnaires qui s'éloignent parfois de la réalité. Pour réaliser des simulations instationnaires d'écoulements, les méthodes de type LES (Large Eddy Simulation) -- plus précises mais plus coûteuses -- sont de plus en plus utilisées. Cependant, ces méthodes sont

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38

Darbyshire, Oliver Richard. "Modelling of turbulent stratified flames." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/247473.

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Due to concerns about pollutant emission combustion systems are increasingly being designed to operate in a lean premixed mode. However, the reduction in emissions offered by lean premixed combustion can be offset by its susceptibility to instabilities and ignition and extinction problems. These instabilities, caused by the coupling of unsteady heat release and pressure fluctuations can cause significant damage to combustion devices. One method of avoiding these problems whilst still operating a globally lean system is to employ a stratified premixed mode where areas of richer mixture are used

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39

Heitor, Manuel Frederico Tojal de Valsassina. "Experiments in turbulent reacting flows." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/12044.

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40

Zhang, Yang. "Experimental studies of turbulent mixed flames." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358981.

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41

Chen, Lu. "Computational Study of Turbulent Combustion Systems and Global Reactor Networks." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/78804.

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A numerical study of turbulent combustion systems was pursued to examine different computational modeling techniques, namely computational fluid dynamics (CFD) and chemical reactor network (CRN) methods. Both methods have been studied and analyzed as individual techniques as well as a coupled approach to pursue better understandings of the mechanisms and interactions between turbulent flow and mixing, ignition behavior and pollutant formation. A thorough analysis and comparison of both turbulence models and chemistry representation methods was executed and simulations were compared and validat

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42

Courtiaud, Sébastien. "Étude et simulation de la postcombustion turbulente des explosifs homogènes sous-oxygénés." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/20093/1/courtiaud.pdf.

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En physique des explosifs, la postcombustion désigne la phase de combustion qui intervient après la fin de la détonation lorsque l’explosif considéré est initialement déficient en oxydant. Les produits de détonation, qui apparaissent sous la forme d’une boule de feu, peuvent alors à leur tour être oxydés, ce qui permet de libérer une quantité supplémentaire d’énergie dans l’écoulement et d’augmenter le souffle. Ce phénomène complexe est piloté par l’interaction entre des ondes de chocs, une zone de mélange turbulente créée par des instabilités hydrodynamiques de type Rayleigh-Taylor et Richtmy

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43

Cook, Andrew W. "On the simulation and modeling of turbulent reacting flows /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/7040.

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44

Jaouen, Nicolas. "An automated approach to derive and optimise reduced chemical mechanisms for turbulent combustion." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMIR03/document.

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La complexité de la chimie joue un rôle majeur dans la simulation numérique de la plupart des écoulements réactifs industriels. L'utilisation de schémas cinétiques chimiques détaillés avec les outils de simulation actuels reste toutefois trop coûteuse du fait des faibles pas de temps et d'espaces associés à la résolution d'une flamme, bien souvent inférieurs de plusieurs ordres de grandeur à ceux nécessaires pour capturer les effets de la turbulence. Une solution est proposée pour s'affranchir de cette limite. Un outil automatisé de réduction de schémas cinétiques est développé sur la base d'u

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45

Ruan, S. "Turbulent partially premixed combustion : DNS analysis and RANS simulation." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/244504.

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Increasingly stringent regulation of pollutant emission has motivated the search for cleaner and more efficient combustion devices, which remain the primary means of power generation and propulsion for all kinds of transport. Fuel-lean premixed combustion technology has been identified to be a promising approach, despite many difficulties involve, notably issues concerning flame stability and ignitability. A partially premixed system has been introduced to remedy these problems, however, our understanding on this combustion mode needs to be greatly improved to realise its full potential. This

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46

Goldin, Graham Mark. "A linear eddy model for steady-state turbulent combustion." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/12547.

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47

YAMAMOTO, Kazuhiro, Yasuki NISHIZAWA, and Yoshiaki ONUMA. "Persistence of Laminar Flamelet Structure Under Highly Turbulent Combustion." The Japan Society of Mechanical Engineers, 2003. http://hdl.handle.net/2237/9003.

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48

Bondi, Stefano. "Modelling of turbulent combustion in gas fired boiler burners." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409399.

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49

Chakroun, Nadim Walid. "Dynamics, stability and scaling of turbulent methane oxy-combustion." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115722.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 203-216).<br>Carbon capture and storage (CCS) is an important strategy for reducing CO₂ emissions, with oxy-fuel combustion being one of the most promising technologies because of it is high efficiency and low cost. In oxy-combustion, CH₄/O₂/CO₂ mixtures burn at low temperatures (~~1700 K), high pressures (~~40 bar), where laminar burning velocities are about 7 times lower than in traditional CH₄ /Air mixtures.

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50

Soteriou, Marios C. "Numerical study of turbulent combustion in a shear layer." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12333.

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