• CN:11-2187/TH
  • ISSN:0577-6686

›› 2007, Vol. 43 ›› Issue (4): 159-162.

• 论文 • 上一篇    下一篇

基于计算流体动力学的迷宫型灌水器流量预测

张俊;赵万华;醋强一;唐一平;卢秉恒   

  1. 西安交通大学机械制造系统工程国家重点实验室
  • 发布日期:2007-04-15

PREDICTION FOR DISCHARGES OF LABYRINTH-CHANNEL EMITTERS BASED ON COMPUTATIONAL FLUID DYNAMICS

ZHANG Jun;ZHAO Wanhua;CU Qiangyi;TANG Yiping;LU Bingheng   

  1. State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University
  • Published:2007-04-15

摘要: 通过反求迷宫型灌水器注塑产品的实物结构,建立其流量数值预测的物理模型,分别采用层、紊流模型对40~150 kPa压力下的灌水器流量进行数值计算,并相应开展该灌水器流量与压力关系的试验测试。试验结果验证了计算流体动力学(CFD)方法预测灌水器流量的可行性,同时对比发现紊流模型的计算值更接近于试验值。通过对迷宫流道内流场分布的研究表明,由于流道曲折度较大,其内流体流动状态的转折点大幅度提前,在雷诺数Re=250~300之间时,流动就开始过渡到紊流状态,从而导致灌水器内的流动在40~150 kPa压力测试范围内均处于一种紊流状态。

关键词: 灌水器, 计算流体动力学, 雷诺应力模型, 迷宫流道

Abstract: A physical model for discharges prediction of emitters is reconstructed by reversing the structures of emitter molded parts, and both laminar flow model and turbulence model are adopted to calculate the discharges of labyrinth- channel emitters under the pressure values of 40~150 kPa. Experiments are also performed to test the relationship between emitter discharges and pressure heads. The experimental results verify the feasibility of predicting discharges based on compu- tational fluid dynamics (CFD), and it is also found that turbul- ence model provides better prediction accuracy than laminar flow model does. In addition, the analyses of the flow field distribution in labyrinth channel show that the transitional Reynolds number is much lower than 2 300 due to the continuous sharp bends. At the Reynolds number 250~300, the flow transition occurs, which leads to the fact that the flow inside this emitter is turbulent under the pressures of 40~150 kPa.

Key words: Computational fluid dynamics, Emitter, Labyrinth-channel, Reynolds stress model

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