超空泡航行体加速过程流动特性研究

Research on the flow characteristic of supercavitating vehicle in the process of acceleration

超空泡航行体加速过程是航行体进入高速巡航状态的重要阶段。为了深入了解超空泡航行体加速过程中的流动特性,文中采用基于欧拉两流体模型的CFD方法以及基于相对运动的源项法对超空泡航行体全沾湿加速过程、通气加速过程进行了数值模拟,其中全沾湿过程主要研究了加速过程附加质量变化规律,通气加速过程研究了通气量、重力效应以及航行体攻角对空泡发展速度的影响。研究结果表明全沾湿加速过程中由于加速度较大,附加惯性力影响不能忽略;通气量、航行体攻角对超空泡生成速度均有较大影响,当速度达到50 m/s以上时,重力效应对空泡生成速度影响可以忽略。

The accelerating process of the vehicle is the important stage for the high-speed cursing status.In order to understand the flow characteristics in the accelerating process,the CFD method based on Euler two-fluid model and the source method based on the relative motion are used to study the whole-wet and ventilating accelerating process,in which the change raw of the added mass is investigated during the whole-wet process and the influence on the developing velocity from ventilating volume,the gravity effect as well as the attack angle is studied.The results show that the influence of the accessional inertia force can not be ignored due to the large acceleration in the whole-wet process;the ventilating volume and the attack angle seriously affect the developing velocity of supercavity,the influence of the gravity can be ignored when the velocity is above 50 m/s.