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数值模拟了有外挂物存在的开式空腔的超音速流动。数值计算采用全隐式无分裂方法,湍流模型采用修正的B-L代数模型。研究了有外挂物存在的空腔流动的剪切层自持性振荡,并与无外挂物存在时的现象进行类比。压强与时间的变化曲线、空腔底部流向的静压系数分布以及空腔后壁面法向的静压系数分布表明,空腔内的压力脉动与外挂物所处位置是有关的。对于Rossiter振荡模态,数值计算结果能够与实验结果相吻合。
Numerical simulation of the presence of plug-in open cavity supersonic flow. All implicit non-splitting methods are used for numerical calculation, and the modified B-L algebraic model is used for turbulence model. The self-sustained oscillation of the shear layer in cavity flow with plug-in is studied and compared with the phenomenon of absence of plug-in. The curve of pressure and time, the distribution of static pressure coefficient at the bottom of the cavity and the distribution of static pressure coefficient in the normal direction of the cavity wall show that the pressure pulsation in the cavity is related to the location of the external object. For the Rossiter oscillation mode, the numerical results are consistent with the experimental results.