火箭飞行速度与射流冲击作用关系研究

通过CFD仿真分析了火箭飞行速度与射流冲击作用的关系，利用动网格技术模拟火箭不同的飞行速度；将定常计算方法和动网格方法计算结果对比，指出了两种方法的计算结果产生差异的原因并给出了特征位置选取方法；计算结果表明：不同火箭飞行速度条件下，冲击作用变化趋势基本相同但载荷峰值与飞行速度成反比；定常计算方法可以得到与动网格方法相近的结果，但如果计算的特征位置选取不当会出现较大差异；依据自由射流计算结果确定特征位置可以使两种方法计算结果较为接近。

Research on Relationship Between Rockets Flight Velocity and Jet Impact Effect

The relationship between rockets flight velocity and jet impact effect was researched by CFD simulation.Different rockets flight velocity was simulated by dynamic mesh technology.The calculation re-sults of steady method and dynamic mesh method were compared to analyze the causes for the difference and the selection method of feature position was given.The calculation result show the change trend of im-pact effect is much the same in different rockets flight velocity conditions,but peak load is inversely pro-portional to flight velocity.Steady method can get the similarity results of dynamic mesh method,but in-correct selection will cause significant differences.If feature position is chosen by free jet calculation re-sults,the results of two methods will became close.