超空泡航行体加速段通气规律设计

利用高速射弹试验对超空泡的形态特性进行了研究,获得了空泡数与超空泡形态参数之间的拟合公式.以此为基础,结合相关文献中的空泡数与通气系数之间的经验公式等,对水下超空泡航行体加速段通气规律进行了系统研究,并给出了算例设计.设计结果表明,加速段速度从25 m/s增长到95 m/s的过程中,要求通气量在0.002~0.17 m3/s,而超空泡长度从0.57 m增长到2.24 m,覆盖模型的95%表面积,具有很好的理论减阻效果.

Design of the ventilation law for accelerated motion of supercavitating vehicle

A series of high-speed projectile experiments have been conducted to investigate the characters of natural supercavitation.The fitting formula of the dependence of the character parameters of supercavitation on the cavity number was obtained by the analysis of experimental data.Based on above formula and some reported empirical formulas,a ventilation law for accelerated motion of underwater supercavitating vehicle was designed.The design shows that during the progress of the velocity increasing from 25 m/s to 95 m/s,the volumetric ratio of air blowing into the cavity should change between 0.002 and 0.17 m3/s,which ensures the cavity length increasing from 0.57 m to 2.24 m.About 95% area of the model's surface is enveloped by supercavity when the length of the cavity increases to 2.24 m,and the effect of drag reduction should be in evidence in theory.