Myring型回转体直航阻力计算及艇型优化

Direct route drag calculation and shape optimization of Myring shape axisymmetric revolution body

在水下智能机器人(AUV)方案设计阶段,针对如何在主尺度和巡航速度确定的前提下得到直航阻力最小的回转体形状这个问题,以Myring型回转体为研究对象,利用计算流体力学(CFD)方法计算其在水中做匀速直航运动时的阻力并与试验值比较以验证准确性。分别对二维和三维2种网格形式,标准和加强2种壁面函数的计算精度和计算效率进行了对比,并在此基础上探讨单独改变艏部或艉部形状时阻力的变化规律。再利用EXCEL、ICEM、FLUENT建立优化平台,基于多岛遗传算法在限制条件范围内对Myring型回转体参数进行全局寻优,寻找不同流速时阻力最小的Myring型回转体,为AUV设计阶段的阻力性能预报和艇型优化提供参考。

When main dimensions and cruising speed have been predefined, how to get an axisymmetric revolution body with minimal drag force at the conceptual design stage of autonomous underwater vehicles （ AUVs） has been a problem. This paper analyzed drag force of Myring shaped axisymmetric revolution body moving underwater in a direct route, at constant speed, by CFD method and compared with the experiment value to check the veracity. 2D or 3D mesh, standard or enhanced wall treatment function was adopted respectively to figure out the accuracy and effciency. And on this basis, the change law of drag when changing merely length and shape of the nose or tail was discussed. Based on multiisland and genetic algorithm （ MIGA ） , an optimization platform was constructed with EXCEL, ICEM and FLUENT to search for the best axisymmetric revolution body with minimal drag force at different speed when volume is predefined. This is a good reference for calculating and minimizing total drag of AUVs.