基于伯努利方程与边界层理论的水下航行体减阻特性分析

针对超空泡航行体减阻特性,基于伯努利方程与边界层理论,分析航行体在超空泡状态下相比于全沾湿状态和局部空化状态下的减阻特性,并讨论航行体的头部圆锥半角、长径比与尾部外形对航阻的影响。仿真结果表明:超空泡航行体具有明显的减阻效果;在同样的航行体长径比约束下,减小长度相比于减小直径其增阻效果更趋明显;圆台尾部相比于圆柱尾部的减阻效果随着空泡腔体的增大而渐趋弱化。

Analysis of Drag Reduction Characteristics of Underwater Vehicles Based on Bernoulli Equation and Boundary Layer Theory

Based on the Bernoulli equation and the boundary layer theory, the drag reduction characteristics of supercavity bodies in the supercavity state are analyzed compared with those in the fully wetted state and the partially cavitating state, and the effects of the nose cone half angle, the length-diameter ratio and the tail shape on the drag are discussed. The simulation results show that the drag reduction effect of supercavity vehicle is obvious. Under the constraint of the same length-diameter ratio, the drag increase effect of reducing the length is more obvious than that of reducing the diameter, and the drag reduction effect of the frustum of a cone tail is weaker than that of the cylinder tail with the increase of the cavity.