The hydrodynamic characteristic of transonic motion projectiles with different head diameters are investigated by numerical simulation. Compressibility effect in liquid-phase water are modeled using the Tait state equation. The result shows that with increasing of velocity the compression waves transfer to shock waves，which cause the significant increasing of pressure and decreasing the dimensions of supercavities. While the increasing of head diameter, the thickness, the vapor volume fraction and the drag coefficient of supercavities are all enhanced, which is conducive to the stability of transonic-speed projectiles. The cavity dynamics of the different head projectiles are compared, and the results shows when Mach number is in high region, the truncated cone head projectile is enveloped by a cavity which results in less drag and better stability.

通过数值模拟研究了不同头部直径的跨音速运动弹头的水动力特性。使用Tait状态方程对液相水中的可压缩性效应进行建模。结果表明，随着速度的增加，压缩波转变为冲击波，导致压力显着增加，超腔尺寸​​减小。随着杆头直径的增加，超腔的厚度，蒸气体积分数和阻力系数均得到增强，有利于跨音速弹丸的稳定性。比较了不同头部弹丸的腔动力学，结果表明，当马赫数位于较高区域时，