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质心位置对超空泡射弹尾拍运动影响分析

DOI: 10.13700/j.bh.1001-5965.2014.0014, PP. 1754-1760

Keywords: 多相流,超空泡射弹,尾拍运动,质心位置,尾拍力

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Abstract:

基于均质平衡流理论,通过求解混合介质的RANS(Reynolds-AveragedNavier-Stokesequations)方程、SST(ShearStressTransport)湍流方程和不同介质之间的质量输运方程,结合刚体运动方程和网格变形方法,研究了不同质心位置的超空泡射弹尾拍运动特性以及尾拍运动下超空泡形态特性,对比分析了不同质心位置的超空泡射弹尾拍运动的刚体运动和尾拍力的变化特征.结果表明,射弹尾拍运动对空泡形态的对称性有较大影响,发生碰撞处的空泡壁面朝着弹体转动的方向发展;射弹尾拍运动的转动角度、角速度、角加速度以及尾拍阻力和尾拍升力等都表现出周期性变化规律,且随着质心与射弹头部距离的增加,转动惯量增大,变化周期也增大.

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