【摘要】 利用气液两相混合模型,对超高压纯水射流除锈机真空工作腔内射流冲击区的流场进行了数值模拟.数值计算结果表明:靶距(清洗机喷嘴到除锈作业面的距离)的优化范围为7-15 mm;高速射流的打击力和剪切力随靶距的变化而变化,它们在靶距15 mm时到达峰值,该结论已被试验所证明;k-ω模型的稳定性和收敛性在所采用的紊流模型中是最好的,计算机时也最少,最经济.更多还原

【Abstract】 Rust removal process using superhigh pressure water jet is carried out in a close vacuum cavity.The numerical simulation for complicated flow field of superhigh pressure striking water jet in a restricted space is conducted with the help of mixture model for air and fluid two-phase flow.The calculate conclusions are:1.the optimizing range for pressure and speed of flow field is H(the striking distance from nozzle outlet to cleaning surface) = 7-15 mm;2.the striking force and shearing force of high-speed water jet vary with the changing of H and they reach their peak values when H=15 mm.This conclusion is consistent with the test results;and 3.the stability and convergence of the k-ω model are the best among all applicable simulation models for turbulence flow;and these lead to less computational time and higher efficiency.更多还原