Results 41 to 50 of about 186,702 (237)
FireThe fractional change in the reaction progress variable gradient depends on the flow normal straining within the flame and also upon the corresponding normal gradients of the reaction rate and its molecular diffusion transport. The statistical behaviours
Nilanjan Chakraborty, Cesar Dopazo
doaj +1 more source
The Role of Differential Diffusion during Early Flame Kernel Development under Engine Conditions -- Part I: Analysis of the Heat-Release-Rate Response [PDF]
Combustion and Flame 221 (2020), 502-515, 2019 Although experimental evidence for the correlation between early flame kernel development and cycle-to-cycle variations (CCV) in spark ignition (SI) engines was provided long ago, there is still a lack of fundamental understanding of early flame/turbulence interactions, and accurate models for full engine simulations do not exist.
arxiv +1 more source
The Coherent Flame Model for Turbulent Chemical Reactions [PDF]
, 1977 A description of the turbulent diffusion flame is proposed in which the flame structure is composed of a distribution of laminar diffusion flame elements, whose thickness is small in comparison with the large eddies.
Broadwell, James E., Marble, Frank E.
core
Case Studies in Thermal Engineering, 2015 Implementation of the adiabatic steady PPDF flamelet model involves a lot of variations including different scalar dissipation rate calculation methods and different mass diffusion models of the opposed jet flame.
Qiong Li +3 more
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On Classical Solutions for A Kuramoto–Sinelshchikov–Velarde-Type Equation
Algorithms, 2020 The Kuramoto–Sinelshchikov–Velarde equation describes the evolution of a phase turbulence in reaction-diffusion systems or the evolution of the plane flame propagation, taking into account the combined influence of diffusion and thermal conduction of the
Giuseppe Maria Coclite, Lorenzo di Ruvo
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The Interaction of High-Speed Turbulence with Flames: Turbulent Flame Speed [PDF]
Combustion and Flame, 158, 2 (2011), pp. 301-326, 2011 (Abridged) Direct numerical simulations of the interaction of a premixed flame with driven, subsonic, homogeneous, isotropic, Kolmogorov-type turbulence in an unconfined system are used to study the mechanisms determining the turbulent flame speed, S_T, in the thin reaction zone regime. High intensity turbulence is considered with the r.m.s.
arxiv +1 more source
Fluid-mechanical structure of methane-air and propane-air turbulent premixed flames
Nihon Kikai Gakkai ronbunshu, 2015 The flow fields of lean and rich propane-air and methane-air turbulent premixed flames of the identical conditions of laminar burning velocity and characteristic of turbulence have been closely examined by using a three-color six-beam LDV system.
Yasuko YOSHIDA +2 more
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How "mixing" affects propagation and structure of intensely turbulent, lean, hydrogen-air premixed flames [PDF]
Combust. Flame, 273 (2025), 113903Understanding how intrinsically fast hydrogen-air premixed flames can be rendered much faster in turbulence is crucial for systematically developing hydrogen-based gas turbines and spark ignition engines. Here, we present fundamental insights into the variation of flame displacement speeds by investigating how the disrupted flame structure affects ...
arxiv +1 more source
Vortex-induced extinction behavior in methanol gaseous flames: a comparison with quasi-steady extinction [PDF]
, 2000 Using a combination of HCHO planar laser-induced fluorescence and laser Doppler velocimetry measurements, the extinction behavior of methanol counterflow diffusion flames was examined experimentally under conditions in which the extinction was brought ...
Gomez, Alessandro +3 more
core +2 more sources
On the dynamics of flame edges in diffusion-flame/vortex interactions [PDF]
Combustion and Flame, 2007 We analyze the local flame extinction and reignition of a counterflow diffusion flame perturbed by a laminar vortex ring. Local flame extinction leads to the appearance of flame edges separating the burning and extinguished regions of the distorted mixing layer.
Hermanns Navarro, Miguel +2 more
openaire +2 more sources