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针对CFD方法模拟时参数选择对圆柱型灌水器迷宫式流道内部流动的模拟精度有较大影响的问题,采用正交试验的方法,对网格单元尺寸(0.20、0.15、0.10、0.07mm)、湍流模型(Reynolds应力方程模型、标准k-ε模型、RNG k-ε模型、Realizable k-ε模型)、近壁面处理函数(Standard壁面函数、Non-Equilibrium壁面函数、Enhanced壁面函数、Scalable壁面函数)进行3因素4水平正交试验,对比各试验条件下CFD模拟值与实测值的偏差量,选择精度较高的模拟方法,并在此模拟基础上对迷宫流道进行了优化。结果表明:网格大小为0.07mm,湍流模型为Reynolds应力方程模型,近壁面采用Scalable壁面函数时模拟精度最高。
Aiming at the problem that the parameter selection has a great influence on the simulation accuracy of the labyrinth flow in the cylindrical emitter when the CFD method is used, the orthogonal test is used to determine the grid cell size (0.20, 0.15, 0.10 and 0.07 mm) , The turbulence model (Reynolds stress equation model, the standard k-ε model, the RNG k-ε model, the Realizable k-ε model), the Non-Equilibrium wall function, the Enhanced wall function, ) Was used to conduct 3-factor 4-level orthogonal experiment. The deviation between the simulated and measured CFD values under each experimental condition was compared, and the simulation method with high accuracy was selected. Based on this simulation, the maze flow channel was optimized. The results show that the grid size is 0.07mm, the turbulence model is the Reynolds stress equation model, and the maximum wall accuracy is obtained by using Scalable wall function.