Results 211 to 220 of about 16,763 (260)
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IMPACT OF STRETCH ON THE FLAME DYNAMICS OF LAMINAR PREMIXED FLAMES
Inter-Noise 2022, 2023Flame transfer functions (FTF) of laminar premixed flames acoustically forced are analytically investigated and modelled. The study is based on the linearized G-equation, which is used to kinematically track the flame front. In order to incorporate combustion properties, the laminar consumption speed is considered varying depending on the flame front ...
Edoardo Scoletta, Wolfgang Polifke
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Nonlinear Dynamics of Cellular Flames
SIAM Journal on Applied Mathematics, 1992The problem of a flame stabilized by a line source of fuel in the cellular regime, i.e., $L < 1$,where L is the Lewis number, is solved numerically. It is found that as L is decreased, transitions from stationary axisymmetric to stationary cellular to nonstationary cellular flames occur.
Bayliss, Alvin, Matkowsky, Bernard J.
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Annual Review of Fluid Mechanics, 2014
In many continuous combustion processes, such as those found in aeroengines or gas turbines, the flame is stabilized by a swirling flow formed by aerodynamic swirlers. The dynamics of such swirling flames is of technical and fundamental interest. This article reviews progress in this field and begins with a discussion of the swirl number, a parameter ...
Sébastien Candel +4 more
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In many continuous combustion processes, such as those found in aeroengines or gas turbines, the flame is stabilized by a swirling flow formed by aerodynamic swirlers. The dynamics of such swirling flames is of technical and fundamental interest. This article reviews progress in this field and begins with a discussion of the swirl number, a parameter ...
Sébastien Candel +4 more
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On the dynamics of anchored flames
Combustion and Flame, 1990The dynamic and the shape of an anchored premixed flame are analyzed as the result of the sum of wrinkles convected along the flame and of the wrinkles locally induced by the flow. The linear approximation leads to an interference integral that describes the shape as a function of time.
L. Boyer, J. Quinard
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On the Dynamics of a Bunsen Flame
2006The stabilization of a Bunsen flame above the burner rim is simulated using the method of characteristics. Oscilliations of the flame front and of its area due to flow oscilliations are computed.
Bondar, M.L. +1 more
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Novel perspectives on the dynamics of premixed flames
Combustion and Flame, 2013The present study develops an alternative perspective on the response of premixed flames to flow perturbations. In particular, the linear response of laminar premixed flames to velocity perturbations is examined in the time domain, and the corresponding impulse response functions are determined analytically.
Blumenthal, RS +3 more
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Dynamic Electrochemistry in Flame Plasma Electrolyte
Angewandte Chemie, 2012Chemistry in flames: Dynamic electrochemistry in the gas phase is described by considering the ionized medium of a flame as an electrolyte (see picture). This study opens up the possibility of accessing redox reactions that are outside the potential limits set by the solvent in conventional liquid-phase electrochemistry.
Atif, Elahi +2 more
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Flame Root Dynamics and Their Role in the Stabilisation of Lifted Flames
2021This chapter aims to provide a broad overview on the importance of lifted flames in turbulent flows with and without swirl in practical applications for energy production and propulsion. The stabilisation of lifted flames is governed by numerous physical processes that control the behaviour of the flame root or the leading edge.
James C. Massey +2 more
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Laser excitation dynamics of OH in flames
Applied Optics, 1980The response of OH in flames to laser excitation is studied in some detail. The population balance equations are solved numerically using an empirical model for the rotational relaxation rates. The empirical model parameters are fit to experimental spectra using a linear regression procedure and the resulting description of OH behavior is shown to be ...
C, Chan, J W, Daily
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1990
A steady flat flame on a circular burner can become unstable due to a competition between mass diffusivity and thermal diffusivity. The resulting dynamical modes of propagation have both spatial and temporal characteristics. We describe these characteristics for a variety of periodic and chaotic modes of propagation.
M. A. Gorman, M. el-Hamdi, K. A. Robbins
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A steady flat flame on a circular burner can become unstable due to a competition between mass diffusivity and thermal diffusivity. The resulting dynamical modes of propagation have both spatial and temporal characteristics. We describe these characteristics for a variety of periodic and chaotic modes of propagation.
M. A. Gorman, M. el-Hamdi, K. A. Robbins
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