海流对出水空泡演化过程影响机理数值研究

Numerical Study on Influence of Cavity Development Induced by Sea Route during Water Exit

采用数值仿真手段,重点针对海流对空泡演化过程的影响开展研究,形成考虑海流影响的空泡多相流理论与数值计算方法,分析了海流流向及流速影响,获得了海流对空泡发展演化的作用机制及对航行体流体动力特征的影响规律。研究结果表明:航向海流对溃灭阶段的空泡形态变化影响较为明显,不同海流工况下,泡内水、气分布有所不同,高压产生次序及溃灭过程的流动结构变化也因此不同。横向海流作用下的空泡形态差别不大,受到合成来流方向发生偏转的影响,迎流面向横向来流方向偏斜,造成空泡形状不对称。

This article adopted the numerical method,coupling the VOF multiphase method,RNG k-εturbulence model and cavitation model to simulate the influence of cavity development induced by sea route exiting from water.The cavity unsteady developing differences induced by different sea route mode,including current velocity,direction,shear of current was analyzed.The hydrodynamics characteristics of flow field around the underwater vehicle under the interaction of cavity and sea route was presented in this paper.The results indicated that the cavity shape was dramatically impacted by heading sea routes than crossing way.The sea route parameters changed multiphase constituent which resulting in the cavity collapses pattern were variants when the heading routes act on.In addition,the cavity shape was asymmetrically influenced by the crossing sea routes.