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 article, an extension of the flamelet/progress variable (FPV) model for the prediction of extinction and reignition is applied in large-eddy simulation (LES) of flames D and E of the Sandia piloted turbulent jet flame series.
239 citations
TL;DR: In this paper, a direct numerical simulation of a three-dimensional spatially developing turbulent lifted hydrogen jet flame in heated coflow is performed with a detailed mechanism to determine the stabilization mechanism and the flame structure.
Abstract: Direct numerical simulation (DNS) of the near field of a three-dimensional spatially developing turbulent lifted hydrogen jet flame in heated coflow is performed with a detailed mechanism to determine the stabilization mechanism and the flame structure. The DNS was performed at a jet Reynolds number of 11,000 with over 940 million grid points. The results show that auto-ignition in a fuel-lean mixture at the flame base is the main source of stabilization of the lifted jet flame. A chemical flux analysis shows the occurrence of near-isothermal chemical chain branching preceding thermal runaway upstream of the stabilization point, indicative of hydrogen auto-ignition in the second limit. The Damkoehler number and key intermediate-species behaviour near the leading edge of the lifted flame also verify that auto-ignition occurs at the flame base. At the lifted-flame base, it is found that heat release occurs predominantly through ignition in which the gradients of reactants are opposed. Downstream of the flame base, both rich-premixed and non-premixed flames develop and coexist with auto-ignition. In addition to auto-ignition, Lagrangian tracking of the flame base reveals the passage of large-scale flow structures and their correlation with the fluctuations of the flame base. In particular, the relative position of themore » flame base and the coherent flow structure induces a cyclic motion of the flame base in the transverse and axial directions about a mean lift-off height. This is confirmed by Lagrangian tracking of key scalars, heat release rate and velocity at the stabilization point.« less
238 citations
TL;DR: In this article, the effect of dilution with nitrogen on the laminar burning velocity and flame stability of syngas fuel (50% H 2 -50% CO by volume) and fuel-air (21% O 2 -79% N 2 ) mixtures was investigated.
237 citations
TL;DR: In this article, a detailed chemical kinetic mechanism was developed for C1 and C2 fluorinated hydrocarbon destruction and flame suppression using ab initio molecular orbital theory and RRKM and QRRK methods.
236 citations
TL;DR: In this paper, an analysis for the transition characteristics from momentum-to buoyancy-controlled turbulent jet diffusion flames is presented, based on dimensional arguments for the physics in turbulent diffusion flames.
234 citations