Stability and Dynamics of Gaseous Flames and Detonations

A special issue of Fluids (ISSN 2311-5521).

Deadline for manuscript submissions: closed (15 December 2021) | Viewed by 3074

Special Issue Editors


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Guest Editor
1. Center for Combustion Energy, Tsinghua University, Beijing 100084, China
2. Department of Applied Physics and Electronics, Umeå University, SE-901 87 Umeå, Sweden
Interests: combustion; computational fluid dynamics; deflagration-to-detonation transition; flame instabilities; premixed combustion; premixed flame dynamics; boundary layer flashback; flame acceleration

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Guest Editor
Mechanical & Aerospace Engineering, West Virginia University, Morgantown, WV 26506, USA
Interests: flame acceleration; deflagration-to-detonation transition; turbulence and turbulent combustion; fire and mining safety; shale gas burning and utilization; combustion and hydrodynamic instabilities; supercritical and coal oxy-fuel combustion; acoustic coupling to reacting and non-reacting flows
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Special Issue Information

Dear Colleagues,

The entire modern civilization is based on combustion as the main source of energy, and combustion will likely remain the major provider of energy for industry, heating and transportation in the foreseeable decades. Next-generation combustion technologies are expected to be environmentally friendly, safe and energy-efficient. The strategy of improving energy production involves continuous optimization of traditional combustion schemes, as well as the development of novel advanced combustion technologies. The role of numerical methods in the design and development of such technologies is increasing.

The aim of this Special Issue is to collect the recent analytical, computational and experimental advances in the fields of reacting flows, including (though not limited to) premixed flame dynamics and morphology, laminar flames, turbulent burning, combustion instabilities, flame acceleration, deflagration-to-detonation transition, explosions, detonations and propulsion.

Prof. Dr. Damir Valiev
Prof. Dr. V'yacheslav Akkerman
Guest Editors

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Keywords

  • reacting flows
  • combustion instabilities
  • flame morphology
  • flame dynamics
  • laminar flame
  • turbulent combustion
  • flame acceleration
  • deflagration-to-detonation transition
  • explosion
  • detonation

Published Papers (1 paper)

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Research

27 pages, 6566 KiB  
Article
Convective Velocity Perturbations and Excess Gain in Flame Response as a Result of Flame-Flow Feedback
by Thomas Steinbacher and Wolfgang Polifke
Fluids 2022, 7(2), 61; https://doi.org/10.3390/fluids7020061 - 31 Jan 2022
Cited by 3 | Viewed by 2267
Abstract
Convective velocity perturbations (CVPs) are known to play an important role in the response of flames to acoustic perturbations and in thermoacoustic combustion instabilities. In order to elucidate the flow-physical origin of CVPs, the present study models the response of laminar premixed slit [...] Read more.
Convective velocity perturbations (CVPs) are known to play an important role in the response of flames to acoustic perturbations and in thermoacoustic combustion instabilities. In order to elucidate the flow-physical origin of CVPs, the present study models the response of laminar premixed slit flames to low amplitude perturbations of the upstream flow velocity with a reduced order flow decomposition approach: A linearized G-equation represents the shape and heat release rate of the perturbed flame, while the velocity perturbation field is decomposed into irrotational and solenoidal contributions. The former are determined with a conformal mapping from geometry and boundary conditions, whereas the latter are governed by flame front curvature and flow expansion across the flame, which generates baroclinic vorticity. High-resolution CFD analysis provides values of model parameters and confirms the plausibility of model results. This flow decomposition approach makes it possible to explicitly evaluate and analyze the respective contributions of irrotational and solenoidal flows to the flame response, and conversely the effect of flame perturbations on the flow. The use of the popular ad hoc hypothesis of convected velocity perturbation is avoided. It is found that convected velocity perturbations do not result from immediate acoustic-to-hydrodynamic mode conversion, but are generated by flame-flow feedback. In this sense, models for flame dynamics that rely on ad-hoc models for CVPs do not respect causality. Furthermore, analysis of the flame impulse response reveals that for the configuration investigated, flame-flow feedback is also responsible for “excess gain” of the flame response, that is, the magnitude of the flame frequency response above unity. Full article
(This article belongs to the Special Issue Stability and Dynamics of Gaseous Flames and Detonations)
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