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排灌机械工程学报
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排灌机械工程学报  0, Vol. Issue (): 7-    DOI:
泵理论与技术 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
无阀压电泵用平面锥管内部流动特性分析
何秀华 等
Analysis on Flow Characteristic of Flat-Walled Diffusers applied in Valveless Piezoelectric Pumps
He Xiuhua, Zhuo Hongcai, Yang Song,Deng Zhidan*, Li Fu
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摘要 根据流动阻力特性可将平面锥管分为两类:沿扩散方向流阻较小的Ⅰ类流管和沿收缩方向流阻较小的Ⅱ类流管。为了研究锥管的流阻特性,采用数值模拟的方法对最小截面宽度为150?m,高度为150?m的平面锥管进行分析,得到雷诺数范围为100-2000内,收缩方向流阻系数与扩散方向流阻系数的比值?随锥角?及流管长宽比l/w变化的规律。结果表明:流管锥角较小时,?及l/w对?值的影响较大,且流管的流阻特性随?与l/w的变化发生转换;流管扩散方向流阻系数 随?及l/w的变化趋势在Re=100与Re≥500两种情况下相反。Re=100情况下,流管多呈Ⅰ类流管特性,锥角为20°长宽比为20的流管的?值达到最大约为1.22;Re≥500情况下,流管多呈Ⅱ类流管特性,锥角为20°长宽比为1的流管的? 值达到最小约为0.63。研究结果说明不同雷诺数流动下流管的流阻特性相差较大,不同工况下可通过选用合适的流管结构参数来提高无阀微泵的工作效率。
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关键词无阀压电泵;平面锥管;流动特性   转折点   数值模拟     
Abstract: The flat-walled diffuser/nozzle are divided into two groups by flow resistance characteristic: the typeⅠtube and the type Ⅱ tube which has low resistance in the dispersal direction and the contraction direction relatively. The tube with the narrowest wide is 150?m, the depth 150?m is studied, and curves of ratio of two flow resistances in two directions versus cone angle ?  and length-width ratio l/w at Reynolds numbers range of 100-2000 are received. Analysis results shows that ? is dependent on ? and l/w significant when ? is small, and flow resistance transition occurs with certain ? and l/w. The trends of ? varying with ? and l/w are different at Re=100 and Re≥500 obviously. When the Re=100, most of tubes present the typeⅠtube characteristics, and ? reaches the max 1.22 when ? =20°and l/w=20. When Re≥500, most of tubes present the typeⅡtube characteristics, and ? reaches the min 0.63b when ? =20°and l/w=1.The results show that the flow resistances of flat-wall diffuser under different Reynolds number differ greatly. In order to improve the performance of pump, the appropriate structural parameters should be chosen according to the actual working condition when designing.
Key wordsvalveless piezoelectric pump   flat-walled diffuser   flow resistance   transition point;numerical simulation   
引用本文:   
. 无阀压电泵用平面锥管内部流动特性分析[J]. 排灌机械工程学报, 0, (): 7-.
. Analysis on Flow Characteristic of Flat-Walled Diffusers applied in Valveless Piezoelectric Pumps[J]. Journal of Drainage and Irrigation Machinery Engin, 0, (): 7-.
 
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