基于动网格的炮口制退器两相流场数值模拟

为较准确地研究火炮发射时高温高压高速的燃气射流经由炮口制退器的流场，对基于动网格的炮口制退 器两相流场进行数值模拟。利用FLUENT 软件，采用光顺和重构的非结构动网格更新方法，使用结构非结构混合网 格技术，建立炮口制退器的流场模型，对弹丸飞出炮口制退器过程中的膛口流场进行数值模拟，并对比分析了燃气 射流中的固相颗粒与气相耦合的两相流场和单纯气相流场对炮口制退器的影响。计算结果表明：考虑了两相的流场 与单纯气相流场在压强分布上存在明显的区别，可为后续炮口制退器的结构设计与优化研究提供一定的参考。

Numerical Simulation of Muzzle Brake Two-phase Flow Field Based on Dynamic Grid

In order to accurately study the flow field of high-temperature, high-pressure and high-speed gas jet passing through muzzle brake during gun launching, the two-phase flow field of muzzle brake based on moving grid was numerically simulated. Using FLUENT software, the flow field model of muzzle brake was established by using smoothing and reconstructing unstructured dynamic mesh updating method and structured/unstructured hybrid mesh technology, and the effects of two-phase flow field coupled by solid particles and gas phase in gas jet and single gas phase flow field on muzzle brake were compared and analyzed. The results show that there are obvious differences in pressure distribution between two-phase flow field and pure gas-phase flow field, which can provide some reference for the structural design and optimization of muzzle brake.