k-ε双方程湍流模型对制退机内流场计算的适用性分析

Applicability analysis of k-ε turbulence models on numerical simulation of internal flow field of recoil brake

为研究不同双方程湍流模型对制退机内复杂流场计算的适用性,以某火炮制退机为研究对象,建立了实际结构下的三维计算模型,利用动网格与滑移网格技术,实现了火炮实际后坐速度下的制退机内部三维运动流场的数值计算。分别采用标准k-ε模型、RNGk-ε模型和Realizable k-ε模型计算制退机内部各腔室压力,与实验曲线对比,结果表明,应用标准k-ε模型对后坐冲击过程的制退机内部压力计算的误差最小,与实验结果吻合最好。

A three-dimensional computation model with actual sizes was developed by choosing the recoil brake of a certain gun as the research object.Dynamic meshes and sliding meshes techniques were used to numerically calculate the three-dimensional flow field inside the recoil brake at the actual recoiling velocity of the gun.The pressures of the different chambers in the recoil brake were calculated by using the standard k-ε model,the RNG k-ε model and the realizable k-ε model,respectively.And the calculated pressures were compared with the experimental results.Comparisons show that the pressures calculated by the standard k-ε model are in the best agreement with the experimental results.