高速航行体的自然超空泡流阻力特性研究

利用Fluent6.2对水下带圆盘空化器高速航行体的自然超空泡流动进行了数值模拟,计算分析了超空泡高速航行体的阻力特性,研究了空化器直径、航行体长细比对航行体超空泡减阻效果的影响,分析了高速航行体的超空泡减阻率。结果表明,超空泡形态下随着航行体速度衰减,航行体压差阻力系数缓慢减小,粘性阻力系数迅速增大,航行体的总阻力系数增加;航行体阻力系数与头部空化器直径的平方成反比;增加航行体的长细比,可以获得更小的阻力系数;高速航行体的超空泡减阻率可达95%以上。最后将仿真计算结果与水靶道试验进行了对比,二者基本相符。

Research on drag characteristics of natural supercavitation profile for high speed bodies

The natural supercavitation of high-speed bodies with disk cavitator was numerically simulated by commercial CFD software Fluent6.2. Not only the drag characteristics of supercavitation bodies but also the configuration parameter affect on drag reduction were analyzed. Also,the drag reduce ratio of high-speed bodies was calculated. The simulation results show that the viscosity resistance coefficient and vehicle drag coefficient augment with the cavitation number increase,but differential press drag coefficient is reverse;The bodies drag coefficient is inverse ratio with cavitator area;The smaller drag coefficient can be obtained by increasing the slender ratio of the bodies,the drag reduce ratio of high-speed bodies reaches 95%. Numerical simulation results fit well with the results of the underwater range test.