水下航行体双空泡相互作用数值模拟研究

Numerical Simulation Research on Double-bubble Interactions of Underwater Vehicles

摘要:

高速水下航行体头肩部和表面突起等位置很容易产生空泡，不失一般性，将表面突起结构简化为一定高度的台阶。针对简化的航行体模型，基于数值模拟方法研究了头肩部空泡与台阶处空泡、头肩部空泡与尾空泡 2 种类型的双空泡相互作用问题。不同的来流攻角下，头肩部空泡与台阶处空泡的作用过程存在区别，可以分为大攻角和小攻角 2 种类型。当尾空泡内有不可凝结气体时，头肩部空泡与尾空泡的连通过程会伴随泡内压力的迅速变化。

关键词:水下航行体;空泡相互作用;数值模拟

Abstract:

Cavitation bubbles occur easily at the head，shoulder and surface prominences of high-speed underwater vehicles. In this papers，the surface prominences are simplified into steps of a certain height without loss of generality. Based on the simplified vehicle model，2 types of double bubble interactions，which are interactions between shoulder bubble and step bubble，and interactions between shoulder bubble and tail bubble，are studied through numerical simulation method. With different angles of attack，there are differences in the process of interactions between shoulder bubble and step bubble，which can be divided into two types：interactions with large angle of attack and with small angle of attack. When there is non-condensing gas in the tail bubble，the connection process between shoulder bubble and tail bubble will be accompanied by the rapid pressure change in the bubbles.

Key words:underwater vehicles;bubble interactions;numerical simulation