This paper focuses on a new structure in the valveless piezoelectric pump, which has a combination structure of the conical flow channel and two fishtail-shaped bluffbodies in the chamber of the pump. The fishtail-shaped bluffbody is inspired by the shape of the swimming fish to diminish the backflow and optimize the performance of the pump. The performance is studied by changing the shape and size of the inlet and outlet, the bluff bodies’ height and the space between two bluff bodies. The results show that the 3 mm × 3 mm square inlet, 3 mm diameter round outlet, 3 mm height of bluffbodies, 6.8 mm pitch of bluffbodies has a best performance in all 10 prototypes, which implements a maximum flow rate of 87.5 ml/min at 170 V 40 Hz with a noise of 42.6 dB. This study makes a preliminary investigation and theoretical explanation for the subsequent optimization of this structure, improved the performance of the valveless piezoelectric pump, broaden the thinking of the design for the bluffbody for better performance of the valveless piezoelectric pump.

本文重点研究了无阀压电泵中的一种新结构，它具有锥形流道和泵腔内两个鱼尾形钝体的组合结构。鱼尾形钝体的灵感来自游动的鱼的形状，以减少回流并优化泵的性能。通过改变入口和出口的形状和尺寸、钝体的高度和两个钝体之间的空间来研究性能。结果表明，3 mm × 3 mm 方形入口、3 mm 直径圆形出口、3 mm 高度的钝体、6.8 mm 的钝体间距在所有 10 个原型中性能最佳，实现的最大流速为 87.5 ml/min在 170 V 40 Hz 时，噪音为 42.6 dB。