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采用有限体积法对由塞锥截短率为25%的线性塞式喷管和升力体构成的塞式喷管运载器风洞冷流试验模型进行仿真计算,并结合试验测量结果,研究了不同高度(压比)下外流对线性塞式喷管流场结构和性能的影响.结果表明,外流干扰导致线性塞式喷管内流过膨胀和横向侧流强度增加,并影响塞锥底部气流的受限流动;低空工况下外流的存在造成塞锥壁面和底部压强降低以及运载器底部阻力增加,喷管性能损失较大;高空工况下塞锥壁面和底部的压强已经不再受外流的影响,喷管性能损失较小,主要由运载器底部阻力损失造成.
The finite volume method was used to simulate the cold flow test of plug nozzle lance formed by a linear plug nozzle and a lift body with 25% plugging frustration. Based on the experimental measurement results, (Pressure ratio) on the flow field structure and performance of the linear plug nozzle.The results show that the outflow interference causes the linear plug nozzle to flow through the expansion and the lateral flow strength increases, and the impact of the bottom cone flow The pressure drop at the wall and the bottom of the plug cone and the increase of the resistance at the bottom of the carrier increase the loss of the nozzle performance; the pressure on the wall and the bottom of the plug cone at high altitude is no longer affected by the outflow , Nozzle performance loss is small, mainly caused by the loss of resistance at the bottom of the carrier.