单振子双腔体V形管无阀压电泵的流场分析

为了提高泵送流量，获得连续、低脉动的输出特性，设计了一种单振子双腔体V形管无阀压电泵，并建立其几何模型，对其工作原理进行了简要介绍，采用Fluent软件的动网格模型对其内部流动进行数值分析．对压电泵内部流场进行动态模拟，得到不同时期压电泵内部的压力、速度及瞬时流量等动态特征，将双晶片压电振子的动态特征和流体的运动特征有机地结合在一起，结果与压电泵的工作原理相吻合，验证了动网格模型应用于压电泵数值模拟计算的可行性．通过大量的数值模拟研究了驱动频率、压电振子振幅、泵腔高度和V形管位置对单振子双腔体V形管无阀压电泵输出性能的影响．模拟结果表明：驱动频率为250Hz时单振子双腔体V形管无阀压电泵的出口流量最大；压电振子振幅越大，出口流量越大；合理选择一组振幅值、泵腔高度和管道位置，便可得到压电泵的最优输出性能．

Analysis on flow field in V-shape valve-less piezoelectric pump with single oscillator-dual chamber

A kind of V-shape valve-less piezoelectric pump with single oscillator-dual chamber was designed and its geometric model was created. Its internal flows were numerically analyzed by the dynamic mesh model in Fluent. The unsteady flow field in the piezoelectric pump was simulated and the pump unsteady characteristics, such as instantaneous pressure, velocity and flow rate in different periods of time, were obtained. If the dynamic characteristics of the two-chip piezoelectric vibrator was effectively combined with the fluid dynamics, the estimated pump performance would agree with the theoretical characteristics of valve-less piezoelectric pumps, it is suggested that the dynamic mesh model is feasi- ble in the numerical simulations of flow in such a pump. The effects of driving frequency, amplitude of the piezoelectric vibrator, pump chamber height and location of the V-tube on the pump output per- formance were studied by means of considerable numerical simulations. The simulation results show that the maximum outlet flow is obtained at the driving frequency of 250 Hz. Moreover, the greater the amplitude of the piezoelectric vibrator, the higher the outlet flow. When a set of amplitude, pump chamber height and V-tube location are determined reasonably, the output of a piezoelectric pump can get the best performance.