| 摘要: |
| 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、0.07 mm）、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0.07 mm，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。 |
| 关键词: 迷宫灌水器 CFD模拟 正交分析 壁面函数 |
| DOI：10.11841/j.issn.1007-4333.2016.09.17 |
| 投稿时间：2015-08-30 |
| 基金项目:水利部公益性行业科研专项经费项目（201301094） |
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| Research on the CFD simulation accuracy of labyrinth path drip irrigation cylindrical emitter |
|
ZHANG Chong, REN Shu-mei, YANG Pei-ling, ZHANG Zhong-li-li, GUO Meng-ji
|
| (College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China) |
| Abstract: |
| Aiming to the problem that the parameter selection on the CFD method has a greater impact on the simulation precision for labyrinth flow path cylindrical emitter internal flow.An orthogonal test of three factors and four levels were carried out.Factors were the size of grid cell (0.2,0.15,0.10 and 0.07 mm),the selection of turbulence model (Reynolds Stress Equation Model,Standard k-ε Model,RNG k-ε Model and Realizable k-ε Model),the treatment of Near-Wall function (Standard Wall Function,Non-Equilibrium Wall Function,Enhanced Wall Function and Scalable Wall Function).By comparison of the deviation between CFD simulation values and measured values under each experimental condition,a higher accuracy simulation method and further optimization of labyrinth flow path was put forwarded.The results show that when the grid size is 0.07 mm,the turbulence model is Reynolds Stress Equation Mode and the near wall treatment function is the Scalable Wall Function,the simulation accuracy is the highest. |
| Key words: labyrinth emitter CFD simulation orthogonal analysis Near-Wall Function |
