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本文用实验方法研究了二堆跨音扩压器内振荡中的激波与附面层相互作用所形成的出口流场的动态特征及等直延伸管内紊流的沿程发展情况。所用的两个实验模型,面积比均为1.37,扩张角分别为3°和8°。研究结果表明,跨音扩压器出口流场的稳态和动态畸变与扩压器中附面层发展状态密切相关,而附面层的汇合对等直延伸管内紊流的发展起着决定性的作用。在超临界深度相同时,3°模型的激波强度虽然低于8°模型,但其出口流场的动态品质却劣于8°模型。
In this paper, the dynamic characteristics of the exit flow field formed by the interaction between the shock wave and the surfacing layer in the two stacks of transonic diffuser and the development of the turbulence along the straight extension tube are studied experimentally. The two experimental models used, the area ratio was 1.37, the expansion angle was 3 ° and 8 °. The results show that the steady-state and dynamic distortions at the outlet of the transonic diffuser are closely related to the development of the adherent layer in the diffuser. However, the development of turbulence in the confronting straight extension pipe of the diffuser is decisive effect. At the same supercritical depth, the shock intensity of the 3 ° model is lower than that of the 8 ° model, but the dynamic quality of the exit flow field is worse than that of the 8 ° model.