| 摘要: |
| [目的]研究滴灌灌水器的结构参数对其水力性能的影响.[方法]提取齿形迷宫流道灌水器齿宽、齿底距、齿高为结构控制参数,在CAD几何建模的基础上,应用基于CFD(Computational Fluid Dynamics)的流体分析软件FLUENT,对灌水器迷宫流道内流体的流动进行数值模拟,得到流量压力关系以及流场可视化罔,由此分析了各参数对灌水器性能的影响,以及流道内水流的速度矢量分布规律.[结果]当齿高保持恒定时,齿宽和齿底距均与流量、流态指数呈正相关关系,且齿宽对流量、流态指数的影响较齿底距更显著;而齿宽和齿底距保持不变时,齿高与流量、流态指数呈负相关关系.[结论]齿宽相对越小,灌水器消能效果与抗堵塞性能越好.因此,可以通过适当减小齿宽和齿底距、增大齿高等措施改善灌水器的水力性能. |
| 关键词: 滴灌灌水器 迷宫流道 流道结构 流态指数 数值模拟 |
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| 基金项目:国家高技术研究发展计划(863计划)，国家科技支撑计划子课题? |
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| Numerical simulation and flow analysis of labyrinth path of drip irrigation emitters |
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| Abstract: |
| 【Objective】 The research studied the influnce of structural parameters on the hydraulic performance of emitters.【Method】 Extracting the dental width,space between dental bottom and dental height as the structural parameters of emitters,based the CAD geometric model,FLUENT software based on CFD（Computational Fluid Dynamics）to progress numerical simulation was used to find out the relationship of flux and pressure and visual figure of the flow channel of emitters.Finally the effect that the change of parmeters act on hydraulics performance and the law of flow characteristics of emitters was analyzed. 【Result】 When the dental height maintained constant,there was a positive correlation between the discharge and dental width,as well as the space between dental bottoms.Moreover,the effect of dental width was more significant than the space between dental bottoms.While under the condition that the dental width,space between dental bottom were unchangeable,there was a negative correlation between the discharge and dental height.【Conclusion】 The smaller the size of dental width is,the better the emitter hydraulic peformance and anti clogging are.So taking measures such as to reduce the dental width,space between dental bottom or increase the dental height can improve the hydraulic performance of emitters. |
| Key words: drip irrigation emitter labyrinth flow channel flow channel structure flow index numerical simulation |
