基于数值模拟的V形管压电泵优化设计

Optimization design of valve-less piezoelectric pump with V-shape tube based on numerical simulation

分析了V形管内的流动损失,并初步优化V形管无阀压电泵结构,利用CFD软件对改进前后的V形管内流场进行了数值模拟,结果表明:直角汇流管口改为圆角后的V形管流阻系数有了明显提高.通过对比改进前后两种V形管流场速度矢量图,发现圆角V形管可抑制正向流动时管内回流和漩涡的发生,减小流动损失.对不同圆角半径的V形管内流场进行数值模拟,得到不同圆角半径V形流管的流阻系数,表明较大的圆角半径可有效地提高V形管流阻系数,即提高了V形管无阀压电泵的效率.此优化设计可为V形管压电泵的进一步改进提供思路.

Flow loss in V-shape tube was analyzed, and the structure of the valve-less piezoelectric pump with V-shape tube was optimized. CFD software was used to simulate the flows in the original and improved V-shape tubes respectively. The results indicate that the flow resistance coefficient of the improved V-shape tube at bus tube opening with round corner is greater than that with right angle. By comparing the velocity vector distributions in the two tubes, it can be concluded that the bus tube with round comer can restrain the back flow and eddy, thus reduce the flow losses increase. By simulating numerically five V-shape tubes with different radius of comers, it is shown that greater radius of corners can increase flow resistance coefficient of V-shape tube and the efficiency of the valve-less piezoelectric pump. The optimization design of the kind provides a way to further improve the valve-less piezoelectric pump with V-shape tube.