A three-dimensional numerical study on instability of sinusoidal flame induced by multiple

A three-dimensional numerical study on instability of sinusoidal flame induced by multiple shock

waves

Xiao Chen;Gang Dong;Hua Jiang

【期刊名称】《力学学报：英文版》 【年(卷),期】2017(033)002

【摘要】The instabilities of a three-dimensional sinu-soidally premixed flame induced by an incident shock wave with Mach=1.7 and its reshock waves were studied by using the Navier–Stokes (NS) equations with a single-step chemi-cal reaction and a high resolution, 9th-order weighted essen-tially non-oscillatory scheme. The computational results were validated by the grid independence test and the exper-imental results in the literature. The computational results show that after the passage of incident shock wave the flame interface develops in symmetric structure accompanied by large-scale transverse vortex structures. After the interactions by successive reshock waves, the flame interface is gradu-ally destabilized and broken up, and the large-scale vortex structures are gradually transformed into small-scale vortex structures. The small-scale vortices tend to be isotropic later. The results also reveal that the evolution of the flame interface is affected by both mixing process and chemical reaction. In order to identify the relationship between the mixing and the chemical reaction, a