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通过数值求解可压缩Navier-Stokes方程模拟了三维可压缩双组分混合层问题,着重研究了双组分密度比和可压缩效应对混合层发展演化的影响.研究表明,随着密度比的增大,混合层扰动增长率降低.在混合层发展初期,可压缩性作用尤其是斜压效应对旋涡的发展起主导作用;在混合层发展后期,可压缩性影响减弱,旋涡的拉伸扭转效应占主导作用.同时,还分析讨论了可压缩混合层中湍流的转捩及拟序结构的演化过程.
The compressible Navier-Stokes equations are numerically solved to simulate the three-dimensional compressible bicomponent mixed layers. The effects of two-component density ratio and compressibility on the evolution of the mixed layers are studied emphatically. The results show that with the increase of density ratio In the initial stage of mixed layer, the compressibility, especially baroclinic effect dominates the vortex development. In the late stage of the mixed layer, the compressibility effect is weakened, and the torsional torsion effect Dominated role.At the same time, the turbulent transition in the compressible mixed layer and the evolution of the structure of the quasi-structure were analyzed and discussed.