后向台阶横向喷流干扰流场的数值研究

 用有限差分法求解层流全N-S方程,对超音速后向台阶绕流与台阶后横向喷流干扰流场进行了数值模拟。不带喷流的超音速后向台阶绕流数值模拟结果与实验及其他计算结果吻合较好。最后给出横向喷流压力比p_j/p_∞=3.033～7.033和喷口宽度w=0.1h～0.2h(h为台阶高度)时的数值模拟结果。得到了合理的流场结构;并可看到喷流压力比和喷口宽度对流场特性有显著影响,在计算参数范围内,底部压力与系数Q(=wp_j/hp_∞)几乎成线性关系。

NUMERICAL STUDY OF SUPERSONIC FLOW OVER A BACKWARD STEP WITH TRANSVERSE INJECTION

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∞).