通气条件下带栅格翼水下航行体数值仿真研究

Numerical Simulation of Underwater Vehicle with Ggrid Wing Under Active Ventilation

栅格翼可通过自身受到的流体力改善水下航行体姿态,通气技术可以通过改善水下航行体表面流体载荷稳定其姿态,将通气技术应用于带栅格翼航行体有望大幅提高航行体水下垂直运动的稳定性.文中采用重叠网格技术和六自由度求解器对水下航行体运动和流场演化进行了数值模拟,通过与实验结果对比验证了所采用数值计算方法的准确性,分别探究了航行体安装栅格翼和通气以及不同通气率对带栅格翼水下航行体运动稳定性的影响.结果表明:通气和安装栅格翼可以降低航行体水下运动时的偏转角,有利于提高其运动稳定性,其中栅格翼的作用更明显.带栅格翼航行体随着通气率的增加,偏转角减小,当通气空泡长度发展到航行体质心位置以下时,产生与偏转角方向相反的回正力矩,当通气空泡将栅格翼包裹,栅格翼对航行体稳定作用失效,这对通气条件下水下航行体加装栅格翼具有重要的指导意义.

Grid fins can improve underwater vehicles attitude through the fluid forces they received,and ventilation technology can stabilize the attitude of underwater vehicles by improving their surface fluid loading.The application of active ventilation technology to the vehicle with grid fins has been expected to significantly improve the underwater vertical motion stability of vehicles.In this paper,the overlapping grid technology and six-degreeof-freedom solver were used to simulate the movement and evolution of underwater fluid field around the vehicle.Comparing with the experimental results,the accuracy of the numerical calculation method was verified,exploring the effects of ventilation installation of grid wings,and different ventilation rates on the motion stability of underwater vehicles with grid fins.The results show that ventilation and installation of grid wings can help to reduce the deflection angle during the launch process and to improve its motion stability,showing the excellent role of grid wings.And the deflection angle can decrease with increasing of ventilation rate,and when the length of the ventilation cavity develops to the position below center of mass of the vehicle,a normalizing moment opposite to the direction of the deflection angle will be generated,and if the ventilation cavitation wraps grid fins,the grid fins will be invalid.This achievement possesses an important guiding significance for underwater navigational body to install the grid wing and navigate under the condition of ventilation.