雷诺数对淹没冲击射流流场影响的数值预测  

Numerical Investigation of Reynolds Number Effect on Submerged Impinging Jet Flow

作　　者：焦磊[1] 王乐勤[1] 徐如良 

机构地区：[1]浙江大学化工机械研究所 [2]国家石油储备镇海基地有限责任公司

出　　处：《农业机械学报》2005年第4期75-77,85,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：浙江省自然科学基金重大资助项目(项目编号 :ZE0 2 0 8)

摘　　要：采用标准kε模型和壁面函数法,对淹没条件下清洗液射流冲击平板的半封闭流场进行了数值模拟,将3种不同雷诺数的冲击射流流场的计算结果与激光多普勒测速仪的测量结果进行比较,评价了标准kε模型的预测性能,初步探讨了入口条件对计算结果的影响。计算结果表明,在冲击射流靠近冲击板的下游区存在环形回流区,环形回流中心位置随雷诺数Re的变化而有规律性地移动。The standard k-ε model of turbulence in conjunction with the logarithmic law of the wall was applied to the numerical simulation of a submerged turbulent clean liquid jet impinging on a flat plate within a semi-confined space. Numerical results with different Reynolds numbers of 8500, 13000, 23000 were compared with experimental data obtained using laser-Doppler anemometry. The abilities of the standard k-ε model in predicting the impinging jet flow-field and the influence of inlet boundary conditions were assessed. The results indicate that there is a toroidal re-circulation zone in the outflow region. The movement characteristics of the center of the toroid as Re increasing was mapped, which is consistent with the experimental result.

关 键 词：射流流场 雷诺数 数值预测 淹没 标准κ-ε模型 激光多普勒测速仪 计算结果 壁面函数法 数值模拟 射流冲击 预测性能 冲击射流 中心位置 半封闭 清洗液 回流区 冲击板 规律性 环形 下游 

分 类 号：TV734.4[水利工程—水利水电工程] TH814[机械工程—仪器科学与技术]