三棱柱形大长径比预制破片速度衰减规律研究

Research on the Velocity Attenuation Rule of Large-aspect Ratio of Triangular Prism Prefabricated Fragments

为研究三棱柱形大长径比预制破片在翻滚状态下从超音速至亚音速区间的速度衰减规律,建立了破片翻滚模型。并结合数值计算和靶场试验与等效迎风面积法进行对比。结果表明,试验结果与三棱柱形大长径比预制破片速度衰减模型所得结果相吻合,与等效迎风面积法存在较大偏差。证明了三棱柱形大长径比预制破片运动过程中自身的翻滚是不可忽视的,等效面积法会导致计算结果产生较大偏差或失真。

A rolling model is established to describe the velocity attenuation law of triangular prism-shaped prefabricated fragments with large aspect ratio from supersonic to subsonic in the rolling state.The equivalent upwind area method is contrasted under numerical calculation and launch test.The results show that the experimental results are consistent with proposed method but have large deviation from the equivalent upwind area method.It is proved that the rolling of the large aspect ratio fragments can’t be ignored during the movement,and the equivalent area method will cause large deviation or distortion of the calculation result.