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为研究导流块深度对抛物形凹面腔内径向入射激波聚焦过程的影响,对马赫数为1.41的径向入射激波在导流块深度分别为0,5,10,15mm的凹面腔内反射聚焦过程进行了实验研究。结合高速CCD拍摄到的凹面腔中气流流场纹影照片和动态压力传感器测得的聚焦过程中流场的压力变化,对径向入射激波在凹面腔内的反射聚焦过程进行了描述。通过比较不同导流块深度下激波反射聚焦过程,发现随着导流块深度的加深,前导激波聚焦和反射激波聚焦的时间差会减小,使激波聚焦的强度增大,当导流块深度从0mm增加到15mm时,激波聚焦所致的峰值压力从0.39MPa增加到0.51MPa。但是,随着导流块深度的加深,压力增益下降,并使排气过程的难度加大,因此导流块深度为10mm左右时能取得较好的聚焦效果。
In order to study the influence of the depth of deflector on the radial incident shock wave focusing process in a parabolic concave cavity, a radial incident shock wave with a Mach number of 1.41 is injected into the concave cavity with a depth of 0, 5, 10 and 15 mm Reflective focusing process was studied experimentally. The reflection and focusing process of radial incident shock wave in the concave cavity is described in combination with the pressure change of the flow field in the focusing process measured by the high-speed CCD filming of the airflow in the concave cavity and the dynamic pressure sensor. By comparing the reflection refocusing processes at different deflector depths, it is found that with the deepening of the deflector depth, the time difference between the focus of the leading shock and the focus of the reflected shock will decrease and the intensity of the focus will increase. When the depth of flow block increases from 0mm to 15mm, the peak pressure caused by shock focusing increases from 0.39MPa to 0.51MPa. However, with the deepening of the guide block, the pressure gain decreases, and the difficulty of the exhaust process increases. Therefore, a better focusing effect can be obtained when the guide block has a depth of about 10 mm.