水下高速喷气气水流场研究

水下喷气是一个复杂的过程，本文在一定假设的基础上，将复杂的流场分为三部分：喷管内流场、气泡流场及流体水流场。喷管内流场采用准一维模型，用差分格式求解，气泡模型采用滞止等压泡模型；液体流场采用MAC方法，通过步进法实现三个流场的耦合求解。给出了几种环境压力及速度下的数值计算结果，初步掌握了水下喷气的特征。

Numerical simulation of the initial stage of noncondensing high-speed gas jet in liquid

Noncondensing gas jet in liquid is a complicated phenomenon. The flow field was divided into three parts under some assumptions i. e., the nozzle flow field, bubble field and liquid field. The first one was determined by using a quasi one dimensional model with the Godunov difference scheme. The second one was treated as a stagnation flow with equal pressures at any time interval. The third one, including bubble shape, was given by the mark and cell method (MAC). All three parts coupled together were computed step by step. The presented results show some characters of gas jet in liquid.