A two-way coupling for modeling thermoacoustic instabilities in a flat flame Rijke tube
作者： J.P. Moeck , M. Oevermann , R. Klein , C.O. Paschereit , H. Schmidt
DOI: 10.1016/J.PROCI.2008.05.062
关键词:
摘要: Thermoacoustic instabilities are a serious problem for lean premixed combustion systems. Due to different time and length scales associated with the flow field, combustion, acoustics, numerical computations of thermoacoustic phenomena conceptually challenging. This work presents coupled method simulation in low Mach number reacting flows. The acoustics represented by reduced order model that can be obtained from network techniques or finite element computations. A detailed chemistry finite-difference zero solver is used small scale flame dynamics. Under assumption pressure continuous across flame, acoustic time-domain relation mapping velocity perturbation downstream upstream. Closure code, which delivers jump zone. applied an experimental laminar burner-stabilized flat Rijke tube, that exhibits strong oscillations 5k=4 mode geometrical set-up. In addition fundamental oscillation, significant subharmonic response observed. Results compared data. Good qualitative quantitative agreement found.
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