无空化雷头设计及CFD性能分析校验

Design of Torpedo Head without Cavitation and Performance Analysis Based on Computational Fluid Dynamics

利用等强度线源与平行流叠加法设计流线型鱼雷头部外形,使鱼雷头部表面最大减压系数小于空泡数,设计出无空化鱼雷头部轮廓线型。运用流体力学理论分析法求得该鱼雷头部表面的压力分布及最大减压系数,并用计算流体力学(CFD)方法(加空化模型)对所设计雷头进行数值模拟。CFD计算得到的鱼雷头部表面的压力分布与理论公式值相比较,误差在1%以内,验证了数值模型的准确性。最后运用CFD后处理技术,显示设计雷头空化情况,可以看出无空化产生,即验证了所设计雷头的无空化性能。

The superposition of the equal intension of linear source and parallel flow is applied to the shape design of streamline profile of torpedo head to make the maximum pressure reduction coefficient of the torpedo head smaller than cavitation number, therefore the shape of torpedo head without cavitation is designed. The distribution of pressure and the maximum pressure reduc- tion coefficient of the torpedo head are obtain with the theory of hydrodynamics. Then computational fluid dynamics （CFD） and a cavitation model are employed to simulate the performance of the torpedo head. The CFD calculation of pressure distribution on the torpedo head shows an error less than 1% compared with the theoretical result, indicating that the CFD method is valid. In addition, CFD post-processing technology is used to display the cavitation of the torpedo head, demonstrating no cavitation at all. That is to say, the designed torpedo head meet the qualification of no cavitation.