带尾支杆的超声速弹丸湍流底压计算

Computation of the Turbulent Base Pressure of a Projectile with Tail Sting in Supersonic Flow

尽管在超声速湍流情况下，尾支杆对弹丸底部压力的影响没有层流情况下的影响大。但是实验研究表明，带尾支杆的超声速弹丸湍流底部压力随湍流边界层相对厚度增加而增加，随天平尾支杆的相对直径增加而减小。本文介绍一种考虑圆柱体上边界层状态以及尾支杆对绕弹丸超声速湍流底压影响的计算方法，计算结果和实验数据吻合较好，还根据计算和实验结果分析了尾支杆对底压系数的影响。

Although the effect of tail sting on base-pressure ratio of a projectile in turbulent flow is smaller than that in laminar flow, experimental investigations have indicated that the relative base- pressure ratio of a projectile with tail sting increases as the relative turbulent boundarylayer thickness increases and reduces as the relatiye diameter increases in supersonic flow.This paper presents a calculating method considering the effect of both the thickness of turbulent boundary-layer over the projectile and the diameter of a tail sting on the base-pressure ratio of a projectile. The calculating results agree well with the experimental data. According to the calculating and experimental results, the effect of tail sting on the basepressure ratio of a projectile is analysed.