Topic
Diffusion flame
About: Diffusion flame is a research topic. Over the lifetime, 9266 publications have been published within this topic receiving 233522 citations.
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TL;DR: In this paper, the authors investigated the flame structure of an atmospheric swirl-stabilized burner of 30 to 75 kW for various inlet temperatures and air-fuel ratios and revealed the existence of two stable flame types (one lean and one rich) separated by a region of unstable flames characterized by very distinct flame shapes, flame pressure drops, and dynamic pressure oscillations.
69 citations
01 Jan 1994
TL;DR: In this article, the effects of methane, methanol, ethanol, 1-propanol, 2-prolpol, carbon dioxide, and carbon disulfideaddition on soot formation in ethene laminar diffusion flames were examined.
Abstract: The effects of methane, methanol, ethanol, 1-propanol, 2-propanol, carbon dioxide, and carbon disulfideaddition on soot formation in ethene laminar diffusion flames were examined. In this study, one-dimensional (ID) laser-induced incandescence (LII) and fluorescence measurements were used to determine soot volume fraction and relative soot precursor concentration, respectively, in the ethene and (ethene + additive) flames. Up to 60% reductions in soot volume fraction were found with the addition of 25% methanol to an ethene diffusion flame. More significant soot reductions were observed with the addition of carbon disulfide. It has been shown that a more than 50% reduction in soot volume fraction was achieved by adding 9.5% CS 2 . Experimental results strongly suggest suppression of soot formation by methanol and carbon disulfide to be mainly a chemical effect.
69 citations
TL;DR: In this article, a hybrid Eulerian-Lagrangian method is employed to study a laminar unsteady propagating flame through an air/fuel-vapor/fueldroplet mixture in a one-dimensional closed constant volume combustor.
69 citations
TL;DR: In this article, numerical simulation results are presented for two axisymmetric, non-luminous turbulent piloted jet diffusion flames: Sandia Flame D (SFD) and Delft Flame III (DFIII).
69 citations
TL;DR: In this article, the authors present a formulation for the blowout limits of turbulent jet diffusion flames issuing from sources with arbitrary geometries and exit conditions into otherwise quiescent environments.
Abstract: We present a formulation for the blowout limits of turbulent jet diffusion flames issuing from sources with arbitrary geometries and exit conditions into otherwise quiescent environments. It is argued that, while the liftoff characteristics of turbulent diffusion flames appear likely to be controlled by the straining out of flame sheets, the molecular mixing rate at the flame tip controls their blowout characteristics. The concept of a "far-field equivalent source" is introduced, and the local molecular mixing rate in the flow is expressed in terms of the associated far-field scaling laws. Blowout is expected when a resulting algebraic expression reaches a critical value. Results of a "flip" experiment verify the far-field equivalent source formulation. Measurements of the blowout limits over a range of geometries, fuels, and diluents show good agreement with the predictions from this formulation.
69 citations