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在不同谐波扰动促发方式下,观察二维超声速空气/空气自由扩散混合流中涡的形成及演化.考虑含空气组分扩散效应的可压缩Navier-Stokes方程,对流项采用3阶迎风紧致格式离散,输运项采用6阶对称紧致格式离散,非定常时间推进采用3阶紧致存储显式Runge-Kutta方法.在无相差情形下,获得了大尺度基频涡结构的饱和、一次对并、二次对并、三涡对并等现象.在Mac=0.3低对流Mach数下,基频涡较饱满,但流向尺度较小.受空气真实气体特性影响,在Mac=0.8高对流Mach数下未发现涡/小激波结构.
The formation and evolution of vortices in two-dimensional hypersonic mixed air / air diffusive flow were observed under different harmonic disturbances. Considering the compressible Navier-Stokes equation with diffusion of air component, The discretization of the format and the transport term are discretized by the sixth order symmetric compact scheme and the third order compact explicit Runge-Kutta method is used for the unsteady time promotion. Under the condition of no phase difference, the saturation of the large-scale fundamental vortex structure is obtained, One pair and two pairs and three vortex pairs and so on.With Mac = 0.3 low convection Mach number, the fundamental frequency vortex is more full, but the flow direction scale is smaller.According to the real air characteristics of Mac, Eddy / small shock structures were not found under convective Mach numbers.