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为研究两级脉冲爆震发动机凹腔入口宽度对第2级凹腔中激波聚焦过程的影响,设计轴向入射激波聚焦的实验系统,对不同入口宽度下激波反射聚焦的过程进行了实验和数值模拟。采用纹影系统拍摄凹腔中的流场结构,并测量了凹腔顶点处的动态压力。采用保持强稳定性(SSP)的Runge-Kutta格式、weighed essential non-oscillation(WENO)格式和块结构网格自适应加密(SAMR)算法对激波反射、衍射和聚焦的过程进行了数值模拟,数值模拟结果和实验吻合较好。通过分析比较相同马赫数激波通过不同宽度凹腔的反射聚焦过程,发现较小宽度凹腔入口下激波反射和聚焦较强,顶点的压力峰值较高,激波聚焦诱导的射流较强。
In order to study the influence of entrance width of two-stage pulse detonation engine cavity on the shock focusing process in the second-stage cavity, an experiment system of axial incident shock focusing was designed. The reflection refocusing process under different entrance widths Experiment and numerical simulation. The texture of the flow field in the cavity was taken using a smear system and the dynamic pressure at the apex of the cavity was measured. The processes of reflection, diffraction and focusing of shock wave are numerically simulated by the Runge-Kutta scheme, the weighed essential non-oscillation (WENO) scheme and the block-structured grid adaptive encryption (SAMR) The numerical simulation is in good agreement with the experiment. By analyzing and comparing the reflection and focusing processes of shock waves of different widths through the same Mach number, it is found that the shocks near the entrance of the smaller width cavity have stronger reflection and focusing, the peak pressure peaks are higher, and the shock induced by the shock wave is stronger.