中文摘要：

基于三维非定常Euler方程,结合高精度Roe格式以及结构化动网格技术,对弹丸飞离开腔式膛口制退器过程中膛口流场的发展过程进行了数值模拟。根据数值计算结果,讨论了制退器内流场复杂三维瞬态效应的主要特征,与膛口流场的试验阴影照片相吻;根据数值计算结果对开腔式制退器的制退效率进行了计算,其结果与相关试验计算结果相符。文中方法对制退器的总体性能设计具有参考意义。

英文摘要：

The process of projectile flying away from a three-dimensional muzzle brake was numerically simulated using the three-dimensional unsteady Euler equations,the high resolution Roe scheme and the structured dynamic mesh techniques.Based on the calculated results,the main characteristics of the complicated three-dimensional transient effect of muzzle brake were discussed in detail,and the numerical calculations are in good agreement with corresponding previous experimental shadowgraphs in our group.Moreover,the efficiency of the muzzle brake was calculated based on our numerical data,and the results also agree well with our previous corresponding experimental results.Therefore,our method is important for the design of the holistic capability of the muzzle brakes in future.