半球缺无阀压电泵泵送性能优化分析

Optimization Analysis of Pumping Performance for Valve-less Piezoelectric Pump with Hemisphere-segment

半球缺的排列方式、数量及间距直接影响半球缺无阀泵的泵送性能。通过对泵理论流量的推导,揭示了半球缺无阀泵具有泵送流体性能的机理;通过对纵向及横向排列半球缺数量及间距的变化对流场及仿真流量影响的研究,发现半球缺排列方式、间距及数量的改变其实质是改变了半球缺的反正向流阻差这一重要现象;探明了减小横向间距、适当增加纵向间距及适当间距范围内增加半球缺的数量均能提高泵流量的重要规律;最后,通过泵流量试验验证了仿真结论的正确性:以安装有4个纵向及横向等间距10 mm排列半球缺的泵进行试验,分别得到了48.29 m L/min、50.29 m L/min的试验流量,与仿真流量的偏差分别为34.6%、34.0%,进一步验证了相同条件下增加横向排列半球缺数量能获得更好的泵送效果。

The arrangement,number and spacing of hemisphere-segments directly influence the pumping performance of pump. By deducing theoretical pumping flow rate,the essential reason of pumping fluid was revealed. Flow field and simulation flow rate of pump were studied with different numbers and spacings of hemisphere-segments respectively arranged in longitudinal and transverse directions. And the result shows that the changes of arrangement,number and spacing of hemisphere-segments mean that the flow resistance differences between reverse and forward flows were changed. The rules were proved that reducing the transverse spacing, appropriately increasing the longitudinal spacing and increasing hemisphere-segment quantity in proper spacing range could all enhance the pump flow rate. Finally,the simulation conclusion was verified by using pump flow rate test. The experiments were carried out by valve-less pumps installed in four hemisphere-segments with the same spacings of 10 mm arranged in longitudinal and transverse directions,and the experimental flow rates were respectively 48. 29 m L / min and 50. 29 m L / min; the deviations between experimental and simulation flow rates were respectively34. 6% and 34. 0%. The conclusion is further validated that under the same conditions,the better pumping effect can be obtained by increasing the number of hemisphere-segments in transverse arrangement than that in longitudinal arrangement.