带尾裙跨介质航行体高速斜入水实验研究

Experimental study on high-velocity oblique water entry of a trans-media vehicle with tail-skirt

为了研究带尾裙跨介质航行体高速斜入水过程中空泡的发展及运动特性,搭建了高速入水实验平台,并设计了带有内测单元的实验模型,对带尾裙跨介质航行体开展了入水角为20°、入水速度为30~130 m/s的实验研究。采用高速摄像机记录入水空泡,同时由内测单元测量航行体的运动参数和泡内压力,获得了航行体高速斜入水过程中空泡的发展特性、入水运动特性以及泡内压力的变化规律。实验结果表明:带尾裙跨介质航行体在入水过程中形成了滑行运动特性,入水空泡发生弯曲变形现象,随着入水速度的升高,入水弹道向上偏转的趋势更加明显;航行体入水轴向过载峰值作用时间较长,法向过载峰值在入水1.5倍航行体长度后逐渐降至零值附近波动;泡内压力随入水空泡的形成和发展呈现先降低后升高的趋势,且最低压力随入水速度呈线性趋势,形成时间基本一致。

To study the cavity development and motion characteristics of the trans-media vehicle with tail-skirt during the process of oblique water entry at high velocity,a high-speed water-entry experiment at platform was built,and an experimental model with inertial measurement unit system was designed.The experimental study was carried out on the trans-media vehicle model with tail-skirt when the water-entry angle was 20°and the water-entry velocity ranged from 30 m/s to 130 m/s.A highvelocity camera was used to record the cavity during water entry,and the inertial measurement unit was used to measure the motion parameters of the vehicle and the pressure inside the cavity.The cavity development characteristics,the motion characteristics and the changing law of the pressure inside the cavity during the high-velocity oblique water entry were obtained.The experimental results show that the planning motion characteristics was formed during the water-entry process of the trans-media vehicle with tail-skirt,and the bending deformation of the cavity occurred.With the increase of the water entry velocity,the upward deflection trend of the water-entry trajectory became more obvious.The peak axial load of the vehicle entering water lasted for a long interval,so load reduction should be considered in the process of crossing media.The peak normal load gradually dropped to about zero after entering the water 1.5 times the length of the vehicle.During the highvelocity water-entry process,the upper surface of the trans-media vehicle was always wrapped in the cavity.The pressure inside the cavity decreased first and then increased with the formation and development of the cavity.The minimum pressurechanged linearly with the water entry velocity,while the formation time was basically the same.