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为揭示激波对超声速流中凹腔流场的影响规律,在超声速流中利用长9 mm,坡度为23°的斜坡产生激波。组合利用高速摄影仪和纹影仪,采用碘钨灯、连续激光和脉冲激光作为光源,摄像曝光时间分别为1 m s,8 us,8 ns,获得了斜坡激波入射在单个凹腔中部、中后部和后部,以及激波入射在不同构型凹腔相同位置的流场纹影图像。结果表明,凹腔自由剪切层在受到激波撞击后,在入射点前会发生弯曲而偏向主流,在入射点后加速发展和破碎;激波入射点靠近前沿则引起凹腔前沿激波的增强,靠近凹腔后沿导致再附激波减弱。
In order to reveal the influence of shock wave on the flow field of cavities in supersonic flow, a shock wave was generated by using a slope of 9 mm in length and 23 ° in the supersonic flow. Combination of high-speed camera and stripe instrument using a combination of iodine-tungsten lamp, continuous laser and pulsed laser as the light source, camera exposure time were 1 ms, 8 us, 8 ns, received a ramp shock wave incident in the middle of a single cavity, Back and rear, as well as the shockwave images of the shockwave incident on the same position of the cavity with different configuration. The results show that the free shear layer in the cavity is bent before the incident point and deflects to the mainstream after being impacted by the shock wave, accelerates and breaks down after the incident point. When the incident point of the cavity approaches the leading edge, it causes the frontal shock wave of the cavity Increased, near the posterior cavity leads to reentry shock waves weakened.