A Large-Eddy-Simulation Study of Combustion Dynamics of Bluff-Body Stabilized Flames

Hua Guang Li, Prashant Khare, Hong Gye Sung, Vigor Yang

研究成果: Article同行評審

23 引文 斯高帕斯(Scopus)

摘要

A comprehensive numerical study is conducted to explore the dynamic behaviors of a flame stabilized by a triangular bluff body in a straight chamber. The formulation accommodates the complete set of conservation equations with turbulence closure achieved by a large eddy simulation (LES) technique. A G-equation-based level-set flamelet approach is employed to model the interactions between premixed combustion and turbulence. Both non-reacting and reacting flows are treated, with special attention given to the effect of inlet boundary conditions on the flame evolution. The flow around the bluff body consists of boundary layers, separated shear layers, a recirculation zone and a wake. Their mutual coupling, as well as interactions with acoustic motion and flame oscillation are analyzed in detail. The physical processes responsible for driving combustion instabilities and the mechanism of energy transfer from chemical reactions in the flame zone to acoustic oscillations in the bulk of the chamber are investigated systematically. Intensive resonance is found to occur between shear-layer instabilities and chamber acoustic waves, when the acoustically reflecting inlet boundary condition is enforced. The resulting complex interplay among acoustic motion, vortex shedding, and unsteady heat release forms a feedback loop and excites combustion instabilities with large flow oscillations.

原文English
頁(從 - 到)924-952
頁數29
期刊Combustion science and technology
188
發行號6
DOIs
出版狀態Published - 2016 六月 2

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 化學工程 (全部)
  • 燃料技術
  • 能源工程與電力技術
  • 物理與天文學 (全部)

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