非流线型水下航行体阻力测量试验中的几个问题

在高速水洞内,进行了某水下航行体模型自然状态和通气产生超空泡状态下的阻力试验,并针对实验中的尾撑影响、阻力成分和尺度效应问题,用数值模拟方法进行了分析.结果表明,自然状态下非流线型航行体的阻力比流线型的增加很多,压差阻力为主要成分;通气形成超空泡后可以大大降低航行体的阻力;尾撑使得阻力测量值偏大;自然状态下航行体原型比模型的阻力系数小,通气后二者基本相同.

Problems in drag measuring test of non-streamlined underwater body

In high-speed water tunnel, drag tests of the underwater body model under natural and artificial ventilated conditions are carried out separately, and the numerical simulation is used to analyze the effect of tail support, drag components and scale effect. The result shows that the drag of the non-streamlined body under natural condition is greatly increased compared with that of the streamlined body. The pressure drag is the main component. When the artificial ventilated supercavity is formed, the drag is greatly decreased. The measuring drag is larger because of the tail support. Under natural condition, the drag coefficient of the original body is smaller than that of the model, and under artificial ventilated condition they are almost equal.