流体可压缩性对高速入水流体动力的影响

Effect of compressibility on hydrodynamic force of high-speed fluid entering water

为研究在不同马赫数下流体的可压缩性对射弹高速入水时的影响,对0.2马赫、1马赫、1.3马赫数的射弹入水三维流场进行数值仿真,对是否考虑流体可压缩性能进行计算,分析了流体可压缩性对流场特性、空泡形态、射弹动力特性的影响。结果表明,流体的可压缩性对所讨论的各项流场参数的影响随着马赫数的增加变得更加显著。此外,通过对数值计算结果的分析,提出了预测流场最大密度以及射弹头部最大压力与马赫数之间的数学关系式。

In order to study the influence of fluid compressibility on projectiles entering water at a high speed of different Mach numbers, this paper numerically simulates a three-dimensional flow field of the projectile entering water at 0.2 Mach, 1 Mach and 1.3 Mach. It analyzes the influence of fluid compressibility on the characteristics of flow field, cavitation shape and projectile dynamics to decide on whether the calculation of fluid compressibility is feasible or not. The results show that the compressibility of the fluid has an impact on the flow field parameters discussed, and this impact becomes more significant with the increase of the Mach number. In addition, through the analysis of the numerical results, prediction formulas of the maximum density of flow field and the relationship between the maximum pressure of the projectile head and Mach number are also proposed.