高速水下射弹空泡形态及其CFD分析

射弹在水下空泡形态高速运动，实验研究存在很多限制。本文应用两种方法对高速水下射弹的空泡形态及阻力性质进行了研究，一是应用CFD仿真模拟软件，二是应用基于空泡截面独立扩张原理所建立的公式。研究表明：仿真计算结果与公式计算结果吻合很好；随着空化数的减小，空泡的相对长度、相对直径和长细比都在增大；在小空化数下，空泡前部形态基本不变，阻力系数主要为压差阻力系数，其值基本不变。研究结果为射弹的外形设计提供参考。

The underwater high-speed projectile navigates with cavity

Abstract: The underwater high-speed projectile navigates with cavity, which is hard to research through experiment. Other two different measures are applied to research the characteristics of cavity form and the drag force, one is the simulation software CFD, the other is the formula established on the Principle of Independence of Cavity Sections Expansion. The research shows that the results of numerical simulation agree very well with the results of formula computing. As the cavitation number reduces, the relative length and relative diameter of cavity increase, so does the radio of them. While the cavitation number is small, the front form of cavity varies little, and the pressure coefficient which is the most part of drag coefficient also varies little. The conclusion of the research could be used as a reference of the projectile profile design.