Abstract
To improve the output performance of valveless piezoelectric pumps, this paper designed a heteromorphic symmetrical bluff body based on the Karman vortex street principle, to optimize the flow direction and velocity of the liquid. The bluff body dome height, trapezoidal unilateral angle, and rounded corner structure height at different dimensional parameters and their relationship with the pump performance were studied. The pump pressure in both positive and negative directions was simulated and analyzed. At last, a prototype of the pump was made and the output performance was tested. The experimental results show that the maximum flow rate reaches 220.6 ml/min at 190V, 45Hz when the bluff body dome is 8mm, the trapezoidal unilateral angle is 5°, and the rounded corner structure is 6mm. Moreover, when the driving voltage is 190V and the driving frequency is 130Hz, the maximum output pressure reaches 670Pa.
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