关键词: 喷流, 数值模拟, N-S方程, 分离流动

Abstract: The interaction between a supersonic flow around a backward step and transverse injectors (Ma, = 1.05) located on the downstream of the step is simulated with finite difference method by solving the N-S equations numerically. Firsi. the supersonic flows over a backward step without an injecter are computed, and the results are compared with the experiment and other calculations. Then the injector is added, with the pressure ratio pj/p∞ varying from 3.033 to 7.033 and the injector width w equal to 0.1h or 0.2h(h-step height). The reasonable structures of vortes and waves are presented, and the effects of pj/p∞ and w on flow properties are researched. Within the present parameters region, the calculations also show that the pressure at the step bottom is almost linearly related to the factor Q(Q = wpj/hp∞).

Key words: jet, numerical simulation. N-S equations. separation flow