半圆头回转体自然空化流场分析

The Natural Cavitation Flow Field Analysis of Cup Head Bodies of Revolution

采用计算流体动力学软件FLUENT6．3对半圆头回转体进行流场分析，验证模型设置和计算方法的有效性，对不同空化数下的流场进行了求解．结果表明：在标准大气压下，空化数σ=0．096是该种头型的，晦界空化数；随着空化数的减小，超空泡在弹体上的长度逐渐增大，总阻力系数逐渐减小；超空泡具有很好的减阻特性，对于该种头型，减阻能力达59％～75％．

To verify the availability of the model settings and computational method, and explore flow field in different cavitation factors, and analysis of flow field for cup head bodies of revolution has been carried out by using computational field dynamics software FLUENT 6.3. The results show that σ = 0. 096 is critical cavitation factor for this shape head at standard atmospheric pressure; With the decrease of cavitation factor, the length of supercavitation gradually increases in the body and the total drag coefficient gradually reduces; Supercavitation has good drag-reducing properties and its the drag reduction ability can achieve to 59% 75% for this shape head.