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通过多状态对比分析,给出了适用于此侧向喷流问题的非定常数值计算方法,并进行了侧向喷流开启和关闭后非定常流场建立和消退过程的研究。结果表明:喷流启动后,在1.5 ms时,喷流强度和高度达到最大,但此时激波不稳定,进行不稳定摆动,至5 ms时,喷流干扰流场完全建立并达到稳定状态。喷流关闭后,喷流前方弓形激波的强度和高度迅速减小,喷流影响区也迅速减小,由于气流粘性产生的延迟效应,至10 ms时,喷流干扰影响基本消退。
Through the multi-state comparative analysis, the unsteady numerical calculation method suitable for this lateral jet flow problem is given, and the establishment and regression of unsteady flow field after the lateral jet flow is turned on and off are also studied. The results show that the intensity and height of the jet flow reach its maximum at 1.5 ms after the start of the jet flow, but the shock wave is not stable and oscillates unsteadily at 5 ms. By 5 ms, the jet flow disturbance field is completely established and reaches a steady state . After the jet is closed, the intensity and height of the bow shock in front of the jet decrease rapidly, and the influence zone of the jet decreases rapidly. The effect of jet disturbance subsides to 10 ms due to the delay effect of air viscosity.