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Non-premixed Flames (Diffusion Flames)
2011In many combustion processes, the fuel and oxidizer are separated before entering the reaction zone where they mix and burn. The combustion reactions in such cases are called “non-premixed flames,” or traditionally, “diffusion flames” because the transport of fuel and oxidizer into the reaction zone occurs primarily by diffusion.
Sara McAllister +2 more
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Statistics of premixed flame cells
Physical Review A, 1991The statistics of random cellular patterns in premixed flames are analyzed. Agreement is found with a variety of topological relations previously found for other networks, namely, Lewis's law and Aboav's law. Despite the diverse underlying physics, flame cells are shown to share a broad class of geometric properties with other random networks---metal ...
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The premixed flame in a counterflow
Combustion and Flame, 1982Abstract We examine a premixed flame located in a counterflow of fresh cold mixture and hot burnt gas, the latter at a temperature close to that of adiabatic deflagration. A constant density, high activation energy model is adopted, and the steady state response depends essentially on two parameters, the Lewis number, and the temperature of the ...
J. Buckmaster, D. Mikolaitis
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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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Experiments with Premixed Flames
1988A series of experiments with bluff-body stabilised premixed flames has quantified the flammability and stability limits of a wide range of geometric arrangements [1 to 6] and has provided confirmation of the existence of non-gradient diffusion [7, 8], This paper presents some additional measurements and examines the implications of the findings of the ...
S. Sivasegaram, J. H. Whitelaw
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1996
Measurements of laminar flame velocities and the experimental determination of concentration- and temperature profiles in laminar flame fronts were introduced in Chapter 2. A challenge to the combustion scientist is to construct a model that will match the observed concentration- and temperature profiles and allows prediction of events for which there ...
Jürgen Warnatz +2 more
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Measurements of laminar flame velocities and the experimental determination of concentration- and temperature profiles in laminar flame fronts were introduced in Chapter 2. A challenge to the combustion scientist is to construct a model that will match the observed concentration- and temperature profiles and allows prediction of events for which there ...
Jürgen Warnatz +2 more
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2011
A work on turbulent premixed combustion is timely because of increased concern about the environmental impact of combustion and the search for new combustion concepts and technologies. An improved understanding of lean fuel turbulent premixed flames must play a central role in the fundamental science of these new concepts. Lean premixed flames have the
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A work on turbulent premixed combustion is timely because of increased concern about the environmental impact of combustion and the search for new combustion concepts and technologies. An improved understanding of lean fuel turbulent premixed flames must play a central role in the fundamental science of these new concepts. Lean premixed flames have the
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A study on methane–air premixed flames interacting with syngas–air premixed flames
International Journal of Hydrogen Energy, 2010Abstract Numerical study on the interaction between methane–air and syngas–air premixed flames is conducted according to equivalence ratio and global strain rate in detailed chemistry. This study targets at understanding of an interacting combustion system as an alternative retrofit concept where one can modify the existing facilities minimally in ...
Jeong Soo Kim +5 more
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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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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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