跨介质航行器弹性舵翼空化流固耦合仿真分析

Numerical Investigations into the Cavitation Fluid-Solid Coupling for Elastic Rudder Wings of Aerial-Aquatic Vehicle

跨介质航行器水中航行过程中的流固耦合效应是影响航行稳定性和结构安全性的关键问题。基于径向基函数法和模态叠加方法,开展跨介质航行器水中运动过程中空化流动与结构振动的耦合仿真,对航行器三角型截面舵翼的流固耦合效应进行研究,分析了不同攻角下的空泡形态以及舵翼与空化流动的相互作用。分析结果表明,在来流攻角为2°~6°时,航行器及舵翼几乎被包在超空泡内部。当来流攻角为8°时,舵翼的自由端会穿透空泡界面,使其所受水动力比小攻角条件下大一个量级,振动特征也更为复杂。

The fluid-structure interaction effect for the aircraft exiting the water,entering the water and navigating throgh the water is a key issue that affects navigation stability and structural safety.Based on radial basis function method and modal superposition method,in this paper,the coupling simulation between the cavitating flows and the structural vibrations during the aircraft entry process is conducted,the fluid-structural interaction effect of the aircraft rudder wing with the triangular section is investigated,and the supercavitation shape as well as its interaction with the rudder wing is finally analyzed under different angle of attack(AOA).Based on the result analyses,when the inflow AOA ranges from 2°to 6°,the aircraft together with the rudder wing is almost wrapped inside the supercavity.When the inflow AOA is 8°,the free end of the aircraft wing would penetrate the supercavity interface,causing the exited hydrodynamic force an order of magnitude larger than that under a smaller AOA,and the vibration characteristics becomes more complicated.