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在进气道内预先设置轻质堵块迫使进气道不起动,堵块被气流吹出后流道恢复畅通,为激波风洞提供了一种检测进气道自起动能力的方法。为了深入认识预设堵块方法的检测过程,将堵块简化为一个自由度的刚体运动,采用k-ωSST湍流模型,结合铺层动网格技术,对该检测方法进行了二维非定常数值模拟。在Ma_∞=5.9条件下,采用改变堵块质量的方式,获得了三种典型的检测过程。通过分析堵块在气动力作用下的运动与进气道非定常波系演化相互耦合的过程,揭示了堵塞作用产生和消除的流动机理。结果表明,堵塞时间没有显著地改变进气道的自起动能力,预设堵块方法成功检测到进气道在Ma_∞=4.9自起动。此外,建立了预估堵块运动的匀加速模型,预估的堵塞时间与数值模拟结果较为符合。在Ma_∞=5.9条件下,堵块的临界质量约为3.8g。考虑到激波风洞实验时间短暂,应选择合适的堵块。
In the intake port pre-set light blocking block forcing the inlet does not start block block was blown out of the flow channel to restore smooth flow of shock for the wind tunnel provides a method to detect the ability to start the intake port. In order to further understand the detection process of the preset block method, the block block is simplified to a one-degree-of-freedom rigid body motion. The k-ωSST turbulence model is used in combination with the moving bedding grid technique. The 2D unsteady numerical method simulation. Under the condition of Ma_∞ = 5.9, three typical detection processes were obtained by changing the block quality. Through the analysis of the interaction between block motion under aerodynamic forces and the evolution of inlet unsteady wave system, the flow mechanism of blockage generation and elimination is revealed. The results show that the jamming time does not significantly change the self-starting ability of the air intake. The preset block method successfully detects that the air intake self-starts at Ma_∞ = 4.9. In addition, a uniform acceleration model for predicting block motion is established. The predicted block time is in good agreement with the numerical simulation results. At Ma_∞ = 5.9, the critical mass of block is about 3.8g. Taking into account the shock wave wind tunnel experiment time is short, should select the appropriate block block.