特殊无活动部件阀压电泵机理分析与数值模拟

介绍了一种特殊无活动部件阀，采用数值模拟的方法计算得到其不同进口流速下的扩张效率，结果表明：特殊无活动部件阀的效率明显高于扩散阀,采用动网格模型对压电泵内流场进行网格划分，并根据压电泵膜的运动方式进行了用户自定义函数（UDF）编程，将程序调入FLUENT软件，进行固一液耦合模拟计算,给出了压电泵膜在不同振动模态下该特殊无活动部件阀压电泵内的流场特征，证明了泵膜在一阶振动模态附近压电泵有较好的流动性．认为这种动网格模型应用于压电泵的数值模拟计算是正确可行的．

Mechanism analysis and numerical simulation of special type of no-moving-part valve piezoelectric pump

A special type of no-moving-part valve was introduced. The diffuser efficiency at different inlet velocity was obtained by numerical simulation. It was found that the diffuser efficiency of the special type of no-moving-part valve was higher than that of diffuser valve. The flow field of piezoelectric pump is di- vided by means of dynamic mesh, and UDF programmer was inputted to express the motion mode of pie- zoelectric membrane, which was transferred into FLUENT software, and then solid-liquid coupled simula- tion was done. Flow characteristic at different vibration modals was given. It was verified that piezoelec- tric pump has a better fluidity when the pump membrane near the first order vibration modal. It is correct and feasible to use the dynamic mesh model to the numerical simulation of piezoelectric pump.