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采用激波风洞实验与数值模拟相结合的方法,对高超声速带凹腔钝头体的第IV类激波干扰非定常振荡特性进行了考察和分析。结果表明,随着入射激波与弓形激波相对位置的不同,第IV类激波干扰既可能出现稳定的波系干扰结构,也可能出现较为剧烈的非定常振荡现象。在实验条件下,观察到了高频前后振荡和低频上下振荡两种不同的振荡模式。数值模拟结果与实验吻合较好,超声速射流与凹腔的耦合作用在振荡过程中起到了关键作用。
In this paper, shock wave wind tunnel experiment and numerical simulation are used to investigate and analyze the unsteady oscillation characteristics of type IV shock waves in the hypersonic cavity with blunt body. The results show that with the different relative positions of incident shock wave and arcuate shock wave, the disturbance of type IV shock wave may not only appear stable wave disturbance structure but also appear more severe unsteady oscillation phenomenon. Under the experimental conditions, two different oscillation modes of high-frequency oscillation and low-frequency oscillation were observed. The numerical simulation results are in good agreement with the experimental results. The coupling between supersonic jet and cavity plays a key role in the oscillation process.