附壁射流无阀压电微泵的多场耦合模拟  

Multi-field coupling simulation of valveless piezoelectric micropump with wall attached jet

作　　者：何秀华[1] 杨航 杨嵩[1] HE Xiuhua;YANG Hang;YANG Song(School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《排灌机械工程学报》2021年第5期439-444,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51276082)。

摘　　要：为了研究在多场耦合影响下的压电微泵的输出性能,提出了一种新的数值模拟方法,以附壁射流无阀压电微泵为对象进行数值计算,并通过试验验证了数值计算方法的正确性,同时对压电泵的外特性进行了研究.结果表明:随着频率的增大,压电泵的流量和背压都呈现先增大后减小的趋势;当电压为200 V,频率为62.5 Hz时,压电泵的流量和背压都达到最大,分别为0.703 mL/min和0.672 kPa;提取压电振子的位移分布和压电泵瞬时流量的数据,显示压电泵的出口瞬时流量滞后于瞬时电压的原因是耦合作用的影响;随着喉部高度H的增大,压电泵的流量呈现先增大后减小的趋势,当电压为200 V,频率为50.0 Hz,喉部高度H=0.4 mm时流量达到最大,为4.023 mL/min;结合压电振子的最大位移曲线和压电泵内部流场的速度矢量图分析,表明压电振子的最大振幅决定于从泵腔泵出的总流量,而内流场形成的旋涡尺寸和位置决定了进口管和出口管之间流量的分配.To investigate the output performance of valveless piezoelectric micropumps under the influe-nce of multi-field coupling,a numerical simulation method was proposed.The valveless piezoelectric micropumps with wall attached jet was taken as the object for numerical calculation.Experiments were used to verify the feasibility of numerical simulation and the output performance of the pumps were investigated.The results show that the flow rate and back pressure of the pumps first increase and then decrease with the increase of frequency.When the micropump is driven with a voltage of 200 V at 62.5 Hz,the maximum flow rate and the back pressure were 0.703 mL/min and 0.672 kPa,respectively.The displacement distribution of the piezoelectric vibrator and the instantaneous flow rate of the piezoelectric pump were extracted.It was shown that the reason why the instantaneous flow rate of the outlet of the piezoelectric pump lags behind the voltage was due to the influence of the coupling effect.The flow rate of the pumps increase first and then decrease with the increase of the height of throat H.When the micropump is driven with a voltage of 200 V at 50.0 Hz,the maximum flow rate reaches 4.023 mL/min with H=0.4 mm.Combined with maximum instantaneous displacement curve of piezoelectric vibrator and flow field vector,it was shown that the maximum amplitude of the piezoelectric vibrator was determined by the total flow from the pump chamber,and the size and position of the vortex formed in the internal flow field,determined the flow distribution between the inlet and outlet.

关 键 词：无阀压电微泵 附壁射流 多场耦合 数值计算 

分 类 号：S277.9[农业科学—农业水土工程] TH138[农业科学—农业工程]