数值模拟有外挂物的空腔流动

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 simulations of the cavity with a store

Numerical simulations of supersonic flows over open cavities with a store are reported in the paper.The fully implicit unfactored method is employed,in which the revised Baldwin-Lomax turbulent model is used.As there exists a store in the cavity,the flow-induced oscillation of the free shear layer is studied,at the same time,we draw an analogy with the phenomena of the cavity without a store.The pressure fluctuation is pertinent to the position of a store in the cavity,which is demonstrated by 1) the diagram of curves of pressure and time;2) the distribution of the static pressure coefficient in the stream direction of the cavity floor and that in the normal direction of the rear wall.For the 5th Rossiter mode,numerical results compare well with experimental data and good agreement is achieved.