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Teses / dissertações sobre o tema "Stretched Flames"

Autor: Grafiati

Publicado: 14 de setembro de 2024

Última modificação: 25 de julho de 2025

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1

YAMAMOTO, Kazuhiro, and Satoru ISHIZUKA. "Temperatures of Positively and Negatively Stretched Flames." Japan Society of Mechanical Engineers, 2003. http://hdl.handle.net/2237/9370.

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2

Long, Scott R. "Experimental determination of strain rates in stretched laminar diffusion flames." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-08222009-040351/.

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3

Detomaso, Nicola. "Simulation aux grandes échelles de la combustion à volume constant : modélisation numérique des flammes turbulentes en expansion dans les mélanges non homogènes." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP034.

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Le cycle thermodynamique classique des turbines à gaz n'a subi aucune modification majeure au cours des dernières décennies, et les améliorations d'efficacité les plus importantes ont été obtenues en réduisant les pertes thermiques, en augmentant le taux de compression et la température maximale. Malgré les efforts visant à améliorer les performances des chambres de combustion, les technologies actuelles pourraient ne pas être à la hauteur des contraintes environnementales de plus en plus strictes. Par conséquent, une percée technologique est essentielle pour façonner l'avenir des moteurs ther

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4

Nanduri, Jagannath Ramchandra. "A COMPUTATIONAL STUDY OF THE STRUCTURE, STABILITY, DYNAMICS, AND RESPONSE OF LOW STRETCH DIFFUSION FLAME." Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1132237973.

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5

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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6

Hinton, Nathan Ian David. "Measuring laminar burning velocities using constant volume combustion vessel techniques." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:5b641b04-8040-4d49-a7e8-aae0b0ffc8b5.

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The laminar burning velocity is an important fundamental property of a fuel-air mixture at given conditions of temperature and pressure. Knowledge of burning velocities is required as an input for combustion models, including engine simulations, and the validation of chemical kinetic mechanisms. It is also important to understand the effect of stretch upon laminar flames, to correct for stretch and determine true (unstretched) laminar burning velocities, but also for modelling combustion where stretch rates are high, such as turbulent combustion models. A constant volume combustion vessel has

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7

Marshall, Andrew. "Turbulent flame propagation characteristics of high hydrogen content fuels." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53859.

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Increasingly stringent pollution and emission controls have caused a rise in the use of combustors operating under lean, premixed conditions. Operating lean (excess air) lowers the level of nitrous oxides (NOx) emitted to the environment. In addition, concerns over climate change due to increased carbon dioxide (CO2) emissions and the need for energy independence in the United States have spurred interest in developing combustors capable of operating with a wide range of fuel compositions. One method to decrease the carbon footprint of modern combustors is the use of high hydrogen content (HHC

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8

Taylor, Simon Crispin. "Burning velocity and the influence of flame stretch." Thesis, University of Leeds, 1991. http://etheses.whiterose.ac.uk/2099/.

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A new technique is presented for determining burning velocities and stretch effects in laminar flames, and applied to a range of fuel/air mixtures. The speeds of expanding spherical flames, measured by high-speed schlieren cine-photography, are shown to vary with flame radius. A simple phenomenological model has been developed to analyse the data and obtain the one-dimensional flame speed by extrapolation to infinite radius. The validity of the simple model has been tested by using it to analyse the results of detailed simulations of expanding spherical flames. The true one-dimensional flame s

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9

li, zhiliang. "EXPERIMENTAL AND CFD INVESTIGATIONS OF LIFTED TRIBRACHIAL FLAMES." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3048.

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Experimental measurements of the lift-off velocity and lift-off height, and numerical simulations were conducted on the liftoff and stabilization phenomena of laminar jet diffusion flames of inert-diluted C3H8 and CH4 fuels. Both non-reacting and reacting jets were investigated, including effects of multi-component diffusivities and heat release (buoyancy and gas expansion). The role of Schmidt number for non-reacting jets was investigated, with no conclusive Schmidt number criterion for liftoff previously known in similarity solutions. The cold-flow simulation for He-diluted CH4 fuel does not

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10

Roldo, Ismael. "Estudo experimental e teórico de chamas em escoamento de estagnação imersas em meios porosos inertes." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/127905.

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O interesse no desenvolvimento de sistemas eficientes de combustão para reduzir a poluição ambiental e aumentar a eficiência de queima tem chamado a atenção para a combustão em meios porosos inertes. A recirculação de calor, induzida pela matriz sólida a partir dos produtos quentes para os reagentes frios, aumenta a temperatura da chama melhorando a sua estabilidade e permitindo a utilização de combustíveis com baixo poder calorífico. Um estudo teórico recente mostra que uma chama estabilizada por um plano de estagnação imersa em um meio poroso pode, sob certas condições, estender os limites d

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11

Han, Bai. "An Experimental and Computational study on Burner-Generated Low Stretch Gaseous Diffuion Flames." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1112978301.

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12

Bougrine, Sabre. "Modélisation 0D de la combustion des carburants alternatifs dans les moteurs à allumage commandé." Phd thesis, Ecole Centrale Paris, 2012. http://tel.archives-ouvertes.fr/tel-00740654.

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Pour satisfaire les exigences environnementales et d'agrément de conduite, le moteur automobile a évolué en une vingtaine d'années en un système très complexe combinant de nombreux composants de haute technologie avec des stratégies de contrôle très élaborées. L'optimisation et le contrôle de ce système sont alors devenus de véritables challenges pour les constructeurs automobiles. Ces derniers points sont aujourd'hui d'autant plus complexes que le contexte actuel de raréfaction des ressources impose de plus en plus le couplage ou le remplacement des carburants conventionnels par des carburant

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13

Han, Bai. "An experimental and computational study of burner-generated low stretch gaseous diffusion flames." online version, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1112978301.

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14

Demesoukas, Sokratis. "Modélisation 0D/1D de la combustion pour l’optimisation des systèmes de combustion des moteurs à allumage commandé." Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2024.

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De nos jours, la conception de moteurs à combustion interne à allumage commandé exige une consommation de carburant réduite et des émissions polluantes faibles, tout en conservant une performance adéquate. Le coût élevé des essais expérimentaux vient en faveur de l'utilisation de la simulation numérique pour l'évaluation de nouvelles définitions techniques. La modélisation phénoménologique zéro-dimensionnelle de combustion permet d'évaluer les différentes définitions techniques en tenant compte de différents aspects de de la combustion à allumage commandé comme la géométrie, la flamme laminair

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15

Foley, Christopher William. "Attachment point characteristics and modeling of shear layer stabilized flames in an annular, swirling flowfield." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54357.

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The focus of this work was to develop a deeper understanding of the mechanisms of flame stabilization and extinction for shear layer stabilized, premixed flames. Planar experimental studies were performed in the attachment point region of an inner shear layer stabilized flame in an annular, swirl combustor. Through high resolution, simultaneous PIV & CH-PLIF measurements, the instantaneous flow field and flame position was captured enabling the characterization of 2D flame stretch and velocity conditions in the attachment point region. In addition, measurements performed at various equivalence

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16

YAMASHITA, Hiroshi, Naoki HAYASHI, Tsutomu ISAYAMA та ін. "対向流予混合火炎中のOH濃度と燃焼速度". 日本燃焼学会, 2007. http://hdl.handle.net/2237/19735.

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17

Hickman, David Gary. "A study of lean burn combustion in a spark ignition engine." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388654.

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18

Weiler, Justin D. "Numerical Simulation of Flame-Vortex Interactions in Natural and Synthetic Gas Mixtures." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4774.

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The interactions between laminar premixed flames and counter-rotating vortex pairs in natural and synthetic gas mixtures have been computationally investigated through the use of Direct Numerical Simulations and parallel processing. Using a computational model for premixed combustion, laminar flames are simulated for single- and two-component fuel mixtures of methane, carbon monoxide, and hydrogen. These laminar flames are forced to interact with superimposed laminar vortex pairs, which mimic the effects of a pulsed, two-dimensional slot-injection. The premixed flames are parameterized by t

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19

藤田, 英之, Hideyuki FUJITA, 博史山下, Hiroshi YAMASHITA, 友哉中尾 та Tomoya NAKAO. "固体壁の小円孔を通過する予混合火炎の消炎に関する数値解析 (水素-空気予混合火炎の消炎機構)". 日本機械学会, 2003. http://hdl.handle.net/2237/8992.

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20

Abdel-Raheem, Mohamed A. "Numerical study of the characteristics of CNG, LPG and hydrogen turbulent premixed flames." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19612.

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Numerical simulations have proven itself as a significant and powerful tool for accurate prediction of turbulent premixed flames in practical engineering devices. The work presented in this thesis concerns the development of simulation techniques for premixed turbulent combustion of three different fuels, namely, CNG, LPG and Hydrogen air mixtures. The numerical results are validated against published experimental data from the newly built Sydney combustion chamber. In this work a newly developed Large Eddy Simulation (LES) CFD model is applied to the new Sydney combustion chamber of size 50 x

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21

Varea, Emilien. "Experimental analysis of laminar spherically expanding flames." Phd thesis, INSA de Rouen, 2013. http://tel.archives-ouvertes.fr/tel-00800616.

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Laminar burning velocity is very useful for both combustion modeling and kinetic scheme validationand improvement. Accurate experimental data are needed. To achieve this, the spherical flame method was chosen. However various expression for burning velocity from the spherically expanding flame can be found. A theorical review details all the expressions and models for the burning veolcity and shows how they can be obtained experimentally. These models were comparated considering basic fuels - various Lewis numbers. As a result, it is shown that the pure kinematic measurement method is the only

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22

Bariki, Chaimae. "Interaction entre une flamme de prémélange et une structure tourbillonnaire." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2067.

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Comprendre et prédire les différents mécanismes en jeu dans les flammes prémélangées turbulentes est un enjeu crucial pour le dimensionnement ou l’optimisation de nombreux systèmes de combustion. Les écoulements réactifs turbulents se caractérisent par une interaction complexe entre les mouvements hydrodynamiques, le dégagement de chaleur produit par la flamme et la turbulence. Ce défi étant extrêmement difficile à relever, l’étude préalable des interactions entre une flamme plane et une structure tourbillonnaire fournit un cadre canonique idéal pour mieux appréhender et comprendre les mécanis

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23

山本, 和弘, Kazuhiro YAMAMOTO, 悟. 石塚 та Satoru ISHIZUKA. "伸長・回転流れにおける圧力変化と火炎特性". 日本機械学会, 1997. http://hdl.handle.net/2237/9316.

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24

Kochar, Yash N. "Laminar flame speed and stretch sensitivity of hydrocarbon fuels at high preheat, pressure and vitiation." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52216.

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This thesis investigates the laminar flame speed of C₁-C₃ alkanes and their binary mixtures at conditions of interest in natural gas based gas turbines viz. high temperature, pressure and dilution. Laminar flame speed has been found useful not only for validating chemical kinetics mechanisms but also for developing empirical scaling laws for practical combustion systems. The thesis addresses the lack of laminar flame speed data of C₁-C₃ alkanes at preheat (300-650 K), pressure (1-10 atm) and significant oxidizer dilution (15-21 vol% O₂). Over 400 measurements are reported over a wide range of

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25

Johnston, Michael C. "Growth and Extinction Limits: Ground Based Testing of Solid Fuel Combustion in Low Stretch Conditions in Support of Space Flight Experiments." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1511915506999995.

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26

Klarmann, Noah [Verfasser]. "Modeling Turbulent Combustion and CO Emissions in Partially-Premixed Conditions Considering Flame Stretch and Heat Loss / Noah Klarmann." München : Verlag Dr. Hut, 2019. http://d-nb.info/1194288723/34.

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27

Brequigny, Pierre. "Influence de la nature du carburant sur la combustion en moteur à allumage commandé : impact de l’étirement de flamme." Thesis, Orléans, 2014. http://www.theses.fr/2014ORLE2038/document.

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Dans un contexte de diminution des émissions polluantes émises par les moteurs à combustion interne, le secteur des transports assiste à une amélioration des motorisations mais également à une diversification des carburants pour l’automobile. L’utilisation de ces différents carburants entraîne souvent un impact sur les performances de la combustion. Dans le cas du moteur à allumage commandé, la performance dépend du dégagement d’énergie, image de la vitesse de la combustion, soit du front de flamme consommant le mélange air-carburant. Or toute flamme en expansion est théoriquement soumise à de

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28

Benoit, Olivier. "Development and application of a Large-Eddy simulation methodology for the prediction and analysis of cyclic variability in lean-burn spark-ignition engines." Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPAST085.

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Dans le contexte du réchauffement climatique et de l'appauvrissement des ressources en essence, la réduction de la consommation spécifique de carburant (BSFC g/KWh) des moteurs à combustion interne (ICE) à essence est devenue de plus en plus cruciale. Cela peut être réalisé en augmentant le rapport d'équivalence air/carburant (λ) et la quantité d'air à l'aide d'un système de suralimentation. Ce travail de recherche porte sur l'analyse des effets de la dilution sur les variabilités cycliques (CCV) du taux de dégagement de chaleur dans un moteur à combustion interne (ICE) à injection directe d'e

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29

Nan, Yu-Jyun, and 余峻南. "Measurements of Unsteady Stretch for Lean Premixed Turbulent Methane/Air Flames." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/64911772549777167573.

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碩士<br>國立中央大學<br>機械工程研究所<br>93<br>This thesis investigates experimentally the effect of unsteady stretch for lean premixed turbulent methane/air flames interacting with near-isotropic turbulence. We study the effect of Reynolds number (Ref) on local properties of lean premixed flames at two different turbulent intensities. The near-isotropic turbulence is generated in a large cruciform burner that includes a long vertical vessel and a large horizontal vessel equipped with a pair of counter-rotating fans and perforated plates. The long vertical vessel can be used to produce a downward propagatin

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30

Chang, Chung-Chien, and 張中千. "Stretch Measurements of Turbulent Premixed Methane/Air Flames Using High-speed PIV." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/81619478658634718494.

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碩士<br>國立中央大學<br>機械工程研究所<br>92<br>This thesis investigates experimentally the effect of unsteady stretch on laminar premixed flames interacting with turbulent flows. Using a turbulent wake burner and a large cruciform burner, a von Kármán turbulent wake and near-isotropic turbulent flows can be generated, respectively. We applied high-speed particle image velocimetry (PIV) and the laser tomography to quantitatively measure the corresponding strain rate, curvature, stretch rate, and dilatation rate along the interacting flame front with turbulent wake and near-isotropic turbulence. Experiments i

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31

Danby, Sean James. "Experimental quantification of transient stretch effects from vortices interacting with premixed flames." 2008. http://www.lib.ncsu.edu/theses/available/etd-09222008-105850/unrestricted/etd.pdf.

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32

Jou, Luo Feng, and 羅豊州. "Effects of Flow Stretch on Premixed-Flame Propagation in Closed Tube." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/30504991709454040912.

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碩士<br>大葉大學<br>機械工程研究所<br>83<br>Here a hydrodynamic model was proposed for flame propagation in close tube effected by flow stretch. The flame is treated as a surface of discontinuity like in previous work. For the structure governing flame burning rate, large activation energy and large heat release assumptions are used in the model. It is well known that for laminar premixed flames with Lewis number smaller then one propagating in open space, the burning rate will increase when it is subj

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33

De, Vries Jaap. "A STUDY ON SPHERICAL EXPANDING FLAME SPEEDS OF METHANE, ETHANE, AND METHANE/ETHANE MIXTURES AT ELEVATED PRESSURES." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-601.

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High-pressure experiments and chemical kinetics modeling were performed for laminar spherically expanding flames for methane/air, ethane/air, methane/ethane/air and propane/air mixtures at pressures between 1 and 10 atm and equivalence ratios ranging from 0.7 to 1.3. All experiments were performed in a new flame speed facility capable of withstanding initial pressures up to 15 atm. The facility consists of a cylindrical pressure vessel rated up to 2200 psi. Vacuums down to 30 mTorr were produced before each experiment, and mixtures were created using the partial pressure method. Ignition was o

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