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Relevant bibliographies by topics / Unsteady propagating flames

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Academic literature on the topic 'Unsteady propagating flames'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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Journal articles on the topic "Unsteady propagating flames"

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Singh, Aditya Prakash, V. RatnaKishore, S. Minaev, and Sudarshan Kumar. "Numerical investigations of unsteady flame propagation in stepped microtubes." RSC Advances 5, no. 122 (2015): 100879–90. http://dx.doi.org/10.1039/c5ra21704k.

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Flame dynamics near the contraction is governed by flame stretching. Change in fuel–air mass-flux entering flame plays a crucial role in accelerating the propagating flames at certain thermal boundary conditions as flame reaches the contraction.

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Palies, Paul, Milos Ilak, and Robert Cheng. "Transient and limit cycle combustion dynamics analysis of turbulent premixed swirling flames." Journal of Fluid Mechanics 830 (October 5, 2017): 681–707. http://dx.doi.org/10.1017/jfm.2017.575.

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Premixed low swirling flames (methane–air and hydrogen–methane–air) are experimentally investigated for three different regimes. Stable, local transient to instability and limit cycle regimes corresponding to three distinct equivalence ratios are considered. Dynamic mode decomposition is applied to the hydrogen–air–methane flame to retrieve the modes frequencies, growth rates and spatial distributions for each regime. The results indicate that a vortical wave propagating along the flame front is associated with the transition from stability to instability. In addition, it is shown that a key e

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Clavin, Paul, Pierre Pelcé, and Longting He. "One-dimensional vibratory instability of planar flames propagating in tubes." Journal of Fluid Mechanics 216 (July 1990): 299–322. http://dx.doi.org/10.1017/s0022112090000441.

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A complete analysis of the one-dimensional vibratory instability of planar flames of premixed gases propagating in tubes is provided. The driving mechanism results from unsteady coupling between flame structure and acoustic waves through temperature fluctuations. In certain conditions, the strength of such an instability will be proved to be sufficiently strong to produce large-amplitude fluctuations as soon as the flame has travelled a distance of the order of the acoustic wavelength. Stability limits and total amplification of an initial perturbation are computed in the framework of the simp

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North, A., D. Frederick, J. Y. Chen, R. Dibble, and A. Gruber. "Stability and Liftoff of a N2-in-H2 Jet Flame in a Vitiated Co-flow at Atmospheric Pressure." Eurasian Chemico-Technological Journal 16, no. 2-3 (2014): 129. http://dx.doi.org/10.18321/ectj177.

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<p>The stability and liftoff characteristics of a nitrogen (N<sub>2</sub>) diluted hydrogen (H<sub>2</sub>) jet flame in a vitiated co-flow are investigated experimentally with particular attention focused on regimes where multiple stabilization mechanisms are active. Information gleaned from this research is instrumental for informing modeling approaches in flame transition situations when both autoignition and flame propagation influence combustion characteristics. Stability regime diagrams which outline the conditions under which the flame is attached, lifted,

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Ahmed, Umair, Sanjeev Kumar Ghai, and Nilanjan Chakraborty. "Direct Numerical Simulation Analysis of the Closure of Turbulent Scalar Flux during Flame–Wall Interaction of Premixed Flames within Turbulent Boundary Layers." Energies 17, no. 8 (2024): 1930. http://dx.doi.org/10.3390/en17081930.

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The statistical behaviour and modelling of turbulent fluxes of the reaction progress variable and non-dimensional temperature in the context of Reynolds-Averaged Navier–Stokes (RANS) simulations have been analysed for flame–wall interactions within turbulent boundary layers. Three-dimensional Direct Numerical Simulation (DNS) databases of two different flame–wall interaction configurations—(i) statistically stationary oblique wall quenching (OWQ) of a V-flame in a turbulent channel flow and (ii) unsteady head-on quenching (HOQ) of a statistically planar flame propagating across a turbulent bou

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Zhao, Dongmei, Yifan Xia, Haiwen Ge, Qizhao Lin, Jianfeng Zou, and Gaofeng Wang. "Simulations of flame propagation during the ignition process in an annular multiple-injector combustor." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 6 (2019): 1947–64. http://dx.doi.org/10.1108/hff-08-2018-0432.

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Purpose Ignition process is a critical issue in combustion systems. It is particularly important for reliability and safety prospects of aero-engine. This paper aims to numerically investigate the burner-to-burner propagation during ignition process in a full annular multiple-injector combustor and then validate it by comparing with experimental results. Design/methodology/approach The annular multiple-injector experimental setup features 16 swirling injectors and two quartz tubes providing optical accesses to high-speed imaging of flames. A Reynolds averaged Navier–Stokes model, adaptive mesh

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Sinibaldi, Jose O., Charles J. Mueller, and James F. Driscoll. "Local flame propagation speeds along wrinkled, unsteady, stretched premixed flames." Symposium (International) on Combustion 27, no. 1 (1998): 827–32. http://dx.doi.org/10.1016/s0082-0784(98)80478-5.

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NICHOLS, JOSEPH W., and PETER J. SCHMID. "The effect of a lifted flame on the stability of round fuel jets." Journal of Fluid Mechanics 609 (July 31, 2008): 275–84. http://dx.doi.org/10.1017/s0022112008002528.

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The stability and dynamics of an axisymmetric lifted flame are studied by means of direct numerical simulation (DNS) and linear stability analysis of the reacting low-Mach-number equations. For light fuels (such as non-premixed methane/air flames), the non-reacting premixing zone upstream of the lifted flame base contains a pocket of absolute instability supporting self-sustaining oscillations, causing flame flicker even in the absence of gravity. The liftoff heights of the unsteady flames are lower than their steady counterparts (obtained by the method of selective frequency damping (SFD)), o

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Chen, Yiran, Tong Yao, Qian Wang, and Kai Hong Luo. "Large eddy simulation of impinging flames: Unsteady ignition and flame propagation." Fuel 255 (November 2019): 115734. http://dx.doi.org/10.1016/j.fuel.2019.115734.

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Albayrak, Alp, Matthew P. Juniper, and Wolfgang Polifke. "Propagation speed of inertial waves in cylindrical swirling flows." Journal of Fluid Mechanics 879 (September 19, 2019): 85–120. http://dx.doi.org/10.1017/jfm.2019.641.

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Thermo-acoustic combustion instabilities arise from feedback between flow perturbations and the unsteady heat release rate of a flame in a combustion chamber. In the case of a premixed, swirl stabilized flame, an unsteady heat release rate results from acoustic velocity perturbations at the burner inlet on the one hand, and from azimuthal velocity perturbations, which are generated by acoustic waves propagating across the swirler, on the other. The respective time lags associated with these flow–flame interaction mechanisms determine the overall flame response to acoustic perturbations and the

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Dissertations / Theses on the topic "Unsteady propagating flames"

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Wu, Z. Y. "Studies in unsteady flame propagation." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38197.

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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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Di, Sarli Valeria. "Study of unsteady premixed flame propagation during an explosion: interaction between combustion and turbulence." Tesi di dottorato, 2008. http://www.fedoa.unina.it/2240/1/Di_Sarli_Ingegneria_Chimica.pdf.

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Gas explosions almost always occur in presence of obstacles that disturb the flat flame propagation. The unsteady coupling of the moving flame front and the turbulent vortices generated by the local blockage intensifies the flame acceleration and the subsequent overpressure rise. In the present research activity, in order to get insights about the nature of obstacles-induced explosions a fundamental study is performed based on the combined use of advanced experimental and numerical tools. The experiments have been focused on the unsteady flame/vortex interaction. A novel twin section combustio

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Books on the topic "Unsteady propagating flames"

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Harald, Rungaldier, and Lewis Research Center, eds. Unsteady diffusion flames: Ignition, travel, and burnout (SUBCORE project : simplified unsteady burning of contained reactants). National Aeronautics and Space Administration, Lewis Research Center, 1999.

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Krishnan, Radhakrishnan, Zhou Ruhai, and NASA Glenn Research Center, eds. Computation of steady and unsteady laminar flames: Theory. National Aeronautics and Space Administration, Glenn Research Center, 1999.

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Book chapters on the topic "Unsteady propagating flames"

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Continillo, G., and W. A. Sirignano. "Unsteady, Spherically-Symmetric Flame Propagation Through Multicomponent Fuel Spray Clouds." In Modern Research Topics in Aerospace Propulsion. Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4612-0945-4_10.

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"Pulsed X-Ray and Optical Investigators of Unsteady High Velocity Jets Propagating in Gases." 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/10.2514/5.9781600865794.0104.0112.

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Ogle, Russell A. "Confined unsteady dust flame propagation." In Dust Explosion Dynamics. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-803771-3.00008-9.

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"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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Conference papers on the topic "Unsteady propagating flames"

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Goldin, Graham, Zhuyin Ren, Hendrik Forkel, Liuyan Lu, Venkat Tangirala, and Hasan Karim. "Modeling CO With Flamelet-Generated Manifolds: Part 1—Flamelet Configuration." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69528.

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In laminar flamelet modeling, a laminar flame in a simple 0D or 1D configuration is calculated a-priori and parameterized by a few scalars such as mixture fraction and reaction-progress or strain-rate. Transport equations, or algebraic expressions, for these parameters are then solved in 3D CFD simulations, avoiding computationally expensive in-situ chemical kinetic calculations. Typical configurations for laminar flamelets include, in 1D, opposed flow configurations with either non-premixed or premixed streams, freely propagating premixed flames, premixed flames impinging on a (heated) wall,

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Baust, Tobias, Peter Habisreuther, and Nikolaos Zarzalis. "Determination of Laminar Flame Speed and Markstein Numbers Deduced From Turbulent Flames Using the Bomb Method." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57305.

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The flame speed is a central element not only in theoretical combustion and basic research but also a key parameter for several combustion models. Various methods to define and measure laminar flame speed have been applied. One method that is being relevant to determine flame speed and flame stretch (quantified by Markstein numbers) under high pressure and high temperature conditions is the bomb method, where an unsteady spherical expanding flame is investigated in a closed vessel. Especially for higher pressures, instabilities occur in the flame front of spherically expanding flames, due to t

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Lipatnikov, Andrei N., and Jerzy Chomiak. "A Simple Model of Unsteady Turbulent Flame Propagation." In International Fuels & Lubricants Meeting & Exposition. SAE International, 1997. http://dx.doi.org/10.4271/972993.

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Steiner, Tobias, and Konstantinos Boulouchos. "Near-Wall Unsteady Premixed Flame Propagation in S.I. Engines." In International Congress & Exposition. SAE International, 1995. http://dx.doi.org/10.4271/951001.

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Taniguchi, Nobuyuki, Takuji Tominaga, Akiyoshi Hashimoto, and Yuichi Itoh. "Large Eddy Simulation of Turbulent Combustion Flow in a Gas-Turbine Combustor." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45522.

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In views of mechanical engineering, a primary problem in energy equipment design is to control of turbulent flows. Large eddy simulation is applied for analyzing tree-dimensional and unsteady features in gas-turbine combustor. For these purpose, LES with a G-equation flame model based on the flamelet concept is developed on the general co-ordinate grid and is demonstrated in design of a premixed gas-turbine combustor for aircraft engine. The simulations of the flame propagation are executed in some conditions with different relations of the equivalent ratios, and the flame positions and propag

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AGGARWAL, S. "Unsteady flame propagation in a polydisperse single-component fuel spray." In 22nd Joint Propulsion Conference. American Institute of Aeronautics and Astronautics, 1986. http://dx.doi.org/10.2514/6.1986-1525.

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Li, J., F. Richecoeur, T. Schuller, and Y. Huang. "An Acoustic Methodology to Measure Heat Release Rate Fluctuations From Unsteady Laminar Flames." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46431.

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This paper presents first validations of an alternative method to optical diagnostics to evaluate unsteady heat release rate disturbances. The technique is based on the determination of the propagation time of ultrasonic waves crossing a reacting flow. A train of pulses is synthesized and transmitted to the space by a tweeter. This signal is captured before and after its passage through the flame. The cross-correlation of the two signals yields a narrow compressed pulse response with a main lobe corresponding to the time lag between the incident and transmitted signals. The technique is examin

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Bothien, Mirko, Demian Lauper, Yang Yang, and Alessandro Scarpato. "Reconstruction and Analysis of the Acoustic Transfer Matrix of a Reheat Flame From Large-Eddy Simulations." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64188.

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Lean premix technology is widely spread in gas turbine combustion systems, allowing modern power plants to fulfill very stringent emission targets. These systems are, however, also prone to thermoacoustic instabilities, which can limit the engine operating window. The thermoacoustic analysis of a combustor is thus a key element in its development process. An important ingredient of this analysis is the characterization of the flame response to acoustic fluctuations, which is straightforward for lean-premixed flames that are propagation stabilized, since it can be measured atmospherically. Ansa

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Gopalakrishnan, Harish S., Andrea Gruber, and Jonas Moeck. "Response of Autoignition-Stabilized Flames to One-Dimensional Disturbances: Intrinsic Response." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59351.

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Abstract Burning carbon-free fuels such as hydrogen in gas turbines promises power generation with strongly reduced greenhouse gas emissions. A two-stage combustor architecture with a propagation-stabilized flame in the first stage and an autoignition-stabilized flame in the second stage allows for efficient combustion of hydrogen fuels. However, interactions between the autoignition-stabilized flame and the acoustic field of the combustor may result in self-sustained oscillations of the flame front position and heat release rate, which severely affect the stable operation of the combustor. We

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RANGEL, R., and W. SIRIGNANO. "Unsteady flame propagation in a two-dimensional spray with transientdroplet vaporization." In 26th Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics, 1988. http://dx.doi.org/10.2514/6.1988-641.

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