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Literatura académica sobre el tema "Flame Curvatute"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 12 de febrero de 2022

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Artículos de revistas sobre el tema "Flame Curvatute"

1

Haq, M. Z. "Effect of Developing Turbulence and Markstein Number on the Propagation of Flames in Methane-Air Premixture." Journal of Engineering for Gas Turbines and Power 128, no. 2 (2005): 455–62. http://dx.doi.org/10.1115/1.2056537.

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In spark ignition engines, initial flame kernel is wrinkled by a progressively increasing bandwidth of turbulence length scales until eventually the size of the flame kernel is sufficient for it to experience the entire turbulence spectrum. In the present study, an effective rms turbulence velocity as a function of time, estimated by integrating the nondimensional power spectrum density (psd) function for isotropic turbulence, is utilized to analyze the statistical distribution of flame front curvatures and turbulent burning velocities of flames propagating in methane-air premixtures. The dist

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2

Denev, J. A., I. Naydenova, and H. Bockhorn. "Quantification of the Local Heat Release Rate During Flame-Vortex Interactions at Different Lewis Numbers and Equivalence Ratios." Eurasian Chemico-Technological Journal 16, no. 2-3 (2014): 195. http://dx.doi.org/10.18321/ectj183.

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<p>The present work aims at the detailed understanding of the local processes in premixed combustion of hydrogen, methane and propane flames at unsteady conditions. The methodology consists of the analysis of simulations of two-dimensional flame-vortex interactions as well as statistical data obtained from threedimensional Direct Numerical Simulations (DNS) of the flame front interacting with a set of vortexes. Special attention is given to the relationship between the Lewis number (<em>Le</em>) of the fuel and the flame front stretch in terms of both curvature and strain rat

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3

Thiesset, F., F. Halter, C. Bariki, et al. "Isolating strain and curvature effects in premixed flame/vortex interactions." Journal of Fluid Mechanics 831 (October 13, 2017): 618–54. http://dx.doi.org/10.1017/jfm.2017.641.

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This study focuses on the response of premixed flames to a transient hydrodynamic perturbation in an intermediate situation between laminar stretched flames and turbulent flames: an axisymmetric vortex interacting with a flame. The reasons motivating this choice are discussed in the framework of turbulent combustion models and flame response to the stretch rate. We experimentally quantify the dependence of the flame kinematic properties (displacement and consumption speeds) to geometrical scalars (stretch rate and curvature) in flames characterized by different effective Lewis numbers. Whilst

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4

Baum, M., T. J. Poinsot, D. C. Haworth, and N. Darabiha. "Direct numerical simulation of H2/O2/N2 flames with complex chemistry in two-dimensional turbulent flows." Journal of Fluid Mechanics 281 (December 25, 1994): 1–32. http://dx.doi.org/10.1017/s0022112094003010.

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Premixed H2/O2/N2 flames propagating in two-dimensional turbulence have been studied using direct numerical simulations (DNS: simulations in which all fluid and thermochemical scales are fully resolved). Simulations include realistic chemical kinetics and molecular transport over a range of equivalence ratios Φ (Φ = 0.35, 0.5, 0.7, 1.0, 1.3). The validity of the flamelet assumption for premixed turbulent flames is checked by comparing DNS data and results obtained for steady strained premixed flames with the same chemistry (flamelet ‘library’). This comparison shows that flamelet libraries ove

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5

Katragadda, Mohit, and Nilanjan Chakraborty. "A PrioriDirect Numerical Simulation Modelling of the Curvature Term of the Flame Surface Density Transport Equation for Nonunity Lewis Number Flames in the Context of Large Eddy Simulations." International Journal of Chemical Engineering 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/103727.

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A Direct Numerical Simulation (DNS) database of freely propagating statistically planar turbulent premixed flames with Lewis numbersLeranging from 0.34 to 1.2 has been used to analyse the statistical behaviours of the curvature term of the generalised Flame surface Density (FSD) transport equation, in the context of the Large Eddy Simulation (LES). Lewis number is shown to have significant influences on the statistical behaviours of the resolved and sub-grid parts of the FSD curvature term. It has been found that the existing models for the sub-grid curvature termCsgdo not capture the qualitat

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6

Alqallaf, Ahmad, Markus Klein, and Nilanjan Chakraborty. "Effects of Lewis Number on the Evolution of Curvature in Spherically Expanding Turbulent Premixed Flames." Fluids 4, no. 1 (2019): 12. http://dx.doi.org/10.3390/fluids4010012.

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The effects of Lewis number on the physical mechanisms pertinent to the curvature evolution have been investigated using three-dimensional Direct Numerical Simulation (DNS) of spherically expanding turbulent premixed flames with characteristic Lewis number of L e = 0.8 , 1.0 and 1.2. It has been found that the overall burning rate and the extent of flame wrinkling increase with decreasing Lewis number L e , and this tendency is particularly prevalent for the sub-unity Lewis number (e.g., L e = 0.8 ) case due to the occurrence of the thermo-diffusive instability. Accordingly, the L e = 0.8 case

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7

Humphrey, Luke J., Benjamin Emerson, and Tim C. Lieuwen. "Premixed turbulent flame speed in an oscillating disturbance field." Journal of Fluid Mechanics 835 (November 27, 2017): 102–30. http://dx.doi.org/10.1017/jfm.2017.728.

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This paper considers the manner in which turbulent premixed flames respond to a superposition of turbulent and narrowband disturbances. This is an important fundamental problem that arises in most combustion applications, as turbulent flames exist in hydrodynamically unstable flow fields and/or in confined systems with narrowband acoustic waves. This paper presents the first measurements of the sensitivity of the turbulent displacement speed to harmonically oscillating flame wrinkles. The flame is attached to a transversely oscillating, heated wire, resulting in the introduction of coherent, c

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8

Shin, Dong-Hyuk, and Timothy Lieuwen. "Flame wrinkle destruction processes in harmonically forced, turbulent premixed flames." Journal of Fluid Mechanics 721 (March 19, 2013): 484–513. http://dx.doi.org/10.1017/jfm.2013.67.

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AbstractThis paper describes analyses of the nonlinear dynamics of harmonically forced, turbulent premixed flames. A key objective of this work is to analyse the ensemble-averaged dynamics of the flame front position, $\langle \xi \rangle $, excited by harmonic forcing of amplitude $\varepsilon $, in the presence of stochastic flow fluctuations of amplitude $\mu $. Low-amplitude and/or near-field effects are quantified by a third-order perturbation analysis, while the more general case is analysed computationally by solving the three-dimensional level-set equation, extracting the instantaneous

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9

Clavin, Paul, and José C. Graña-Otero. "Curved and stretched flames: the two Markstein numbers." Journal of Fluid Mechanics 686 (September 28, 2011): 187–217. http://dx.doi.org/10.1017/jfm.2011.318.

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AbstractThe analytical result concerning the Markstein number of adiabatic flames was obtained in 1982 with the one-step Arrhenius model in the limit of a large activation energy. This result is not relevant for real flames. The form of the law expressing the flame velocity in terms of the total stretch rate of the flame front through a single Markstein length is not conserved when the location of the front (surface of zero thickness) changes within the flame thickness. It is shown in this paper that two different Markstein numbers ${\mathscr{M}}_{I} \not = {\mathscr{M}}_{II} $ characterize us

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10

LEE, T. W., R. SHANKLAND, and M. FENTON. "Flame Curvature Statistics in Axisymmetric Turbulent Jet Flames." Combustion Science and Technology 108, no. 1-3 (1995): 31–46. http://dx.doi.org/10.1080/00102209508960388.

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Tesis sobre el tema "Flame Curvatute"

1

加藤, 敏宏, Toshihiro KATOH, 直樹林 та ін. "二次元非定常予混合火炎に関する素反応機構による数値解析 (予混合火炎構造を支配する物質量としての反応進行度とその勾配の妥当性)". 日本機械学会, 2005. http://hdl.handle.net/2237/9362.

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2

Capil, Tyler George. "Flame Surface Density Measurements and Curvature Statistics for Turbulent Premixed Bunsen Flames." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/75121.

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In this work, turbulent premixed combustion was analyzed through CH (methylidyne) planar laser induced fluorescence (PLIF). Flame topography measurements in terms of flame surface density and curvature were calculated based on the flame front detected by the CH PLIF signal. The goal of this work was to investigate turbulent flames with extremely high turbulence intensity using a recently developed HiPilot burner (a Bunsen-type burner). The studies were first conducted on a series of piloted jet flames to validate the methodology, and then conducted on the highly turbulent flames generated by t

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3

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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4

Speth, Raymond L. 1981. "Effects of curvature and strain on a lean premixed methane-hydrogen-air flame." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/35640.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.<br>Includes bibliographical references (leaves 74-77).<br>The elemental flame is a subgrid model for turbulent combustion, parameterized by time-varying strain rate and curvature. This thesis develops the unsteady one-dimensional governing equations for the elemental flame incorporating detailed chemical kinetics and transport and a robust and efficient numerical method for solving the governing equations. Hydrogen enrichment of some hydrocarbon fuels has been shown to improve stability and extend flam

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5

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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6

馬目, 聡., Satoshi MANOME, 祐二中村 та ін. "乱流予混合火炎の燃焼診断に対するアセトン-OH同時PLIF計測手法の有効性の検討". 日本機械学会, 2007. http://hdl.handle.net/2237/9380.

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7

Gilchrist, Andrew Robert. "The development and breakaway of a compressible air jet with streamline curvature and its application to the Coanda flare." Thesis, Durham University, 1985. http://etheses.dur.ac.uk/7114/.

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This study concerns an underexpanded jet, issuing from a convergent slot into quiescent air, as it is deflected by a convex surface of constant radius. Emphasis Is placed on the mechanism of breakaway, a phenomenon whereby the jet leaves the surface tangentially. An optical system based on the standard Z-type Schlieren configuration and capable of interferometric, Schlieren and shadowgraph techniques has been designed. The techniques are interchanged simply, a laser source being employed for Interferometry and a Xenon spark source for Schlieren and shadowgraph. Vibrations limit the interferome

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8

Yuen, Frank Tat Cheong. "Experimental Investigation of the Dynamics and Structure of Lean-premixed Turbulent Combustion." Thesis, 2009. http://hdl.handle.net/1807/19306.

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Turbulent premixed propane/air and methane/air flames were studied using planar Rayleigh scattering and particle image velocimetry on a stabilized Bunsen type burner. The fuel-air equivalence ratio was varied from Φ=0.7 to 1.0 for propane flames, and from Φ=0.6 to 1.0 for methane flames. The non-dimensional turbulence intensity, u'/SL (ratio of fluctuation velocity to laminar burning velocity), covered the range from 3 to 24, equivalent to conditions of corrugated flamelets and thin reaction zones regimes. Temperature gradients decreased with the increasing u'/SL and levelled off beyond u'/SL

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9

Lee, Chih-Chieh, and 李志杰. "Quantitative Measurements of Unsteady Strain Rate, Curvature, and Dilatation Rate in a Premixed Flame Interacting with a Turbulent Wake." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/39785893268469406181.

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碩士<br>國立中央大學<br>機械工程研究所<br>90<br>英文摘要 This study investigates experimentally a downward-propagating premixed flame interacting with a decaying turbulent wake for measurements of stretch rates in a 1.5 m long vertical burner with a cross-sectional area of 15×15 cm2. Before a run, the burner was evacuated and then filled with methane-air mixtures at a given equivalence ratio at 1 atm. A run began by ignition at the top of the burner where the top plate was simultaneously opened in order to generate a downward-propagating premixed flame at 1 atm. When the downward-propagating flame was approachin

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10

Wu, Yi-Xuan, and 吳易軒. "Study on the enhanced performance of a horizontal-axis wind turbine system with flake-type double-curvature blades." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/13167022873135767440.

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碩士<br>中原大學<br>機械工程研究所<br>103<br>This thesis conducts a study on the horizontal-axis wind turbine system with flake-type double-curvature blades. The main purpose is to investigate the influence of wind deflector curvature of flake-type blade on its mechanical energy, electrical energy, and conversion efficiency for different wind speeds. First, the double-curvature blades are designed with different curvatures by using flake-type galvanized iron sheets. Second, all the blades are connected to the rotor hub and combined to the generator. Third, the wind speed, rotational speed, torque, and powe

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Capítulos de libros sobre el tema "Flame Curvatute"

1

Fernandez, G., B. Larrouturou, and G. I. Sivashinsky. "Numerical study of curvature effects on flame quenching." In Numerical Combustion. Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/3-540-51968-8_92.

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2

Kolář, Miroslav, Shunsuke Kobayashi, Yasuhide Uegata, Shigetoshi Yazaki, and Michal Beneš. "Analysis of Kuramoto-Sivashinsky Model of Flame/Smoldering Front by Means of Curvature Driven Flow." In Lecture Notes in Computational Science and Engineering. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55874-1_60.

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3

"Flame Curvature and Flame Speed of a Turbulent Premixed Flame in a Stagnation Point Flow." In Dynamics of Heterogeneous Combustion and Reacting Systems. American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/5.9781600866258.0025.0036.

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4

"Effect of Curvature and Dilution on Unsteady, Premixed, Laminar Flame Propagation." In Dynamics of Reactive Systems Part I: Flames and Configurations; Part II: Modeling and Heterogeneous Combustion. American Institute of Aeronautics and Astronautics, 1986. http://dx.doi.org/10.2514/5.9781600865794.0167.0179.

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5

"Flame Curvature as a Determinant of Preferential Diffusion Effects in Premixed Turbulent Combustion." In Advances in Combustion Science: In Honor of Ya. B. Zel'dovich. American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/5.9781600866456.0235.0250.

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6

Lipatnikov, A. N., and J. Chomiak. "TRANSIENT AND CURVATURE EFFECTS WHEN DEFINING BURNING VELOCITY AND SPEED OF PREMIXED TURBULENT FLAMES." In Engineering Turbulence Modelling and Experiments 5. Elsevier, 2002. http://dx.doi.org/10.1016/b978-008044114-6/50082-x.

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Actas de conferencias sobre el tema "Flame Curvatute"

1

Wehrmeyer, Joseph, Robin Osborne, David Mosbacher, Zhongxian Cheng, Robert Pitz, and Chih-Jen Sung. "Investigation of partially-premixed propane-air flames with flame curvature." In 39th Aerospace Sciences Meeting and Exhibit. American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-1083.

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2

Haq, M. Z. "Developing Turbulence on the Propagation of Flames in Methane-Air Premixture." In International Joint Power Generation Conference collocated with TurboExpo 2003. ASMEDC, 2003. http://dx.doi.org/10.1115/ijpgc2003-40143.

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In spark ignition engines, initial flame kernel is wrinkled by a progressively increasing bandwidth of turbulence length scales until eventually the size of the flame kernel is sufficient for it to experience the entire turbulence spectrum. In the present study, an effective r.m.s. turbulence velocity as a function of time, estimated by integrating the non-dimensional power spectrum density function for isotropic turbulence, is utilized in the analysis of the statistical distribution of flame front curvatures and turbulent burning velocities of flames propagating in methane-air premixtures. Th

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3

Yuen, Frank T. C., and O¨mer L. Gu¨lder. "Lean Premixed Turbulent Flame Front Structure and Implications for Modeling." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23214.

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Premixed turbulent flames of methane-air and propane-air stabilized on a Bunsen type burner were studied to investigate the structure of the flame front at a wide range of turbulence intensities covering the range of interest in lean premixed combustors. The flame front data were obtained using planar Rayleigh imaging, and particle image velocimetry was used to measure instantaneous velocity field for the experimental conditions studied. The fuel-air equivalence ratio range was from lean 0.6 to stoichiometric for methane flames, and from 0.7 to stoichiometric for propane flames. The non-dimens

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4

Zhu, Shengrong, and Sumanta Acharya. "Effects of Hydrogen Addition on Swirl-Stabilized Flame Properties." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23686.

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The role of hydrogen addition to swirl-stabilized methane flames is studied experimentally. Of specific interest are flame properties including flame surface density and curvature. The measurements are based on Particle Image Velocimetry (PIV), Mie-scattering and CH-chemiluminescence imaging. Identification of the flame front and its geometric characterization provides an understanding of the flame properties. Compared to the non-reacting flow, the methane flame broadens the central recirculation zone. Hydrogen enriched flames reduce the central recirculation zone and scales down the character

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5

Briones, Alejandro M., Suresh K. Aggarwal, and Vishwanath R. Katta. "Effects of H2-Enrichment on the Propagation Characteristics of CH4-Air Flames." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15148.

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The propagation of H2-enriched CH4-air triple flames in a nonpremixed jet is investigated numerically. The flames are ignited in a nonuniform jet-mixing layer downstream of the burner. A comprehensive, time-dependent computational model is used to simulate the transient ignition and flame propagation phenomena. The model employs a detailed description of methane-air chemistry and transport properties. Following ignition a well-defined flame is formed that propagates upstream towards the burner along the stoichiometric mixture fraction line. As the flame propagates upstream, the flame speed, wh

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6

Nakahara, Masaya, Koichi Murakami, Jun Hashimoto, and Atsushi Ishihara. "An Experimental Study on Properties of Local Burning Velocity for Hydrogen Added Hydrocarbon Premixed Turbulent Flames." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44039.

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This study is performed to investigate directly the local flame properties of turbulent propagating flames at the same weak turbulence condition (u′/SL0 = 1.4), in order to clarify basically the influence of the addition of hydrogen to methane or propane mixtures on its local burning velocity. The mixtures having nearly the same laminar burning velocity with different rates of addition of hydrogen δH are prepared. A two-dimensional sequential laser tomography technique is used to obtain the relationship between the flame shape and the flame displacement. The local flame displacement velocity S

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7

Greenberg, J., and F. Grodek. "Curvature effects on spray diffusion flame extinction." In 40th AIAA Aerospace Sciences Meeting & Exhibit. American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-623.

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8

Marshall, Andrew, Julia Lundrigan, Prabhakar Venkateswaran, Jerry Seitzman, and Tim Lieuwen. "Measurements of Stretch Statistics at Flame Leading Points for High Hydrogen Content Fuels." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26420.

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Fuel composition has a strong influence on the turbulent flame speed, even at very high turbulence intensities. An important implication of this result is that the turbulent flame speed cannot be extrapolated from one fuel to the next using only the laminar flame speed and turbulence intensity as scaling variables. This paper presents curvature and tangential strain rate statistics of premixed turbulent flames for high hydrogen content fuels. Global (unconditioned) stretch statistics are presented as well as measurements conditioned on the leading points of the flame front. These measurements

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9

Kusakai, Takafumi, and Satoshi Kadowaki. "Numerical Simulation on the Instability of Cylindrically Expanding Premixed Flames With Radiative Heat Loss at Low Lewis Numbers." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44181.

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The instability of cylindrically expanding premixed flames with radiative heat loss was studied by two-dimensional unsteady calculations of reactive gases, based on the diffusive-thermal model equation. When the Lewis number was unity, instability phenomena were not observed. When the Lewis number was sufficiently low, on the other hand, cellular-shaped fronts on adiabatic and non-adiabatic cylindrical flames were observed, which was due to diffusive-thermal instability. As radiative heat loss increased, the behavior of cellular fronts became more unstable. This indicated that the radiation pr

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10

Wang, Peiyong, Shengteng Hu, Joseph Wehrmeyer, and Robert Pitz. "Stretch and Curvature Effects on Flames." In 42nd AIAA Aerospace Sciences Meeting and Exhibit. American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-148.

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Informes sobre el tema "Flame Curvatute"

1

Najm, H. N., P. S. Wyckoff, and O. M. Knio. Effect of equivalence ratio on premixed flame response to unsteady strain-rate and curvature. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/658163.

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