径向入射激波聚焦实验和数值模拟研究

发布时间：2018-08-24 19:05

【摘要】：为得到不同入射激波马赫数对凹腔内径向入射激波聚焦过程的影响,对马赫数为1.25和2.18的径向入射激波在实验段内反射聚焦的过程进行了实验和数值模拟研究。用高速CCD拍摄了凹腔中气流流场的纹影图片,并采用保持强稳定性的龙格—库塔格式、加权基本无振荡算法和块结构动态自适应网格加密对激波反射聚焦的过程进行了数值模拟,实验和数值模拟结果吻合较好。复杂的激波形状及其之间的相互作用(如激波反射,激波聚焦和不同激波的相互作用)在实验和数值模拟中都能很好地观测到。通过比较不同马赫数入射激波的反射聚焦过程,发现较高的马赫数下聚焦后能产生射流,而较低的马赫数下却没有。同时发现,入射激波马赫数能影响二次激波出现的位置和强度,进而影响聚焦过程流场的紊乱程度。
[Abstract]:In order to obtain the effect of different incident shock Mach numbers on the focusing process of radial incident shock waves in a concave cavity, the reflection and focusing process of a radial incident shock wave with Mach numbers of 1.25 and 2.18 is studied experimentally and numerically. The images of airflow field in concave cavity were taken by high speed CCD, and the Runge-Kutta scheme was used to maintain strong stability. The process of shock reflection focusing is numerically simulated by weighted basic non-oscillation algorithm and block structure dynamic adaptive mesh encryption. The experimental results are in good agreement with the numerical simulation results. Complex shock shapes and their interactions (such as shock reflection, shock focusing and interaction between different shock waves) can be well observed in both experimental and numerical simulations. By comparing the reflection and focusing processes of incident shock waves with different Mach numbers, it is found that the jet can be produced at higher Mach numbers, but not at lower Mach numbers. It is also found that the Mach number of incident shock wave can affect the position and intensity of the secondary shock wave, and then affect the degree of disturbance of the flow field in the focusing process.
【作者单位】：空军工程大学航空航天工程学院;先进航空发动机协同创新中心;
【基金】：国家自然科学基金青年科学基金(51106178)
【分类号】：O354.5

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