H型压电超声流微泵的流动特性分析  

Flow Characteristics of H-type Micro Pump Based on Piezoelectric Ultrasonic Streaming

作　　者：魏长智[1,2] 魏守水[1] 刘飞飞[1] 

机构地区：[1]山东大学控制科学与工程学院,济南250061 [2]山东省网络环境智能计算技术重点实验室,济南250022

出　　处：《振动．测试与诊断》2013年第4期640-645,725-726,共6页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51075243;31140055)

摘　　要：基于声流原理设计了一种H型压电超声流微泵,分析了各种因素对微泵出口平均速度的影响。采用直接流法计算得到了微泵体内的声流速度矢量图,实现了泵体结构的优化设计。进一步研究了超声流微泵出口平均速度与声流振子的振动位移、驱动频率以及流体动力粘度之间的关系,模拟了出口背压对出口平均速度的影响。分析结果表明,在流体动力粘度较小时,所设计的H型超声流微泵具有较好的泵送性能,通过改变驱动频率和驱动电压能方便地实现微流体的驱动控制。An H-type micro pump based on piezoelectric ultrasonic streaming is designed according to the principle of acoustic streaming,and the influence factors on its average outlet velocity is analyzed.The acoustic streaming velocity vector in the micro pump body is calculated through a direct streaming method and the body structure optimization is completed.The relationships among average outlet velocity and vibration displacement,driving frequency and fluid kinematic viscosity are analyzed.Then the influence of back pressure on the average outlet velocity is simulated.The simulation results show that when the fluid kinematic viscosity is small,the H-type micro pump based on ultrasonic streaming possesses better pumping performance.The pumping velocity can be easily controlled by changing the driving frequency or voltage.

关 键 词：计算流体力学 压电泵 微型泵 声流 

分 类 号：O35[理学—流体力学] TH38[理学—力学]