摘要
基于无阀压电泵中扩散/渐缩管流动特性,提出一种用于无阀压电泵的新型"V"形管,以满足微型全分析系统的应用要求.阐述了"V"形无阀压电泵的结构和工作原理,对"V"形无阀压电泵内的流动进行理论分析,得到了"V"形无阀压电泵的平均流量计算公式和效率公式.采用有限元方法对"V"形管进行模拟计算,得到了"V"形管内正反流动的压力分布,发现"V"形管正反流动的速度存在差异.通过分析得出最优分流角与扩散角.在不同进出口压力差下,对"V"形管、并联扩散管以及"Y"形管的压力损失系数比进行比较,发现前两者压力损失系数比曲线变化趋势具有一致性,证明了"V"形管数值模拟的可靠性.数值计算结果对"V"形无阀压电泵优化设计具有指导意义.
Based on the flow characteristics in diffuser/nozzle, a new type of V-shape tube used in the valveless piezoelectric pump is proposed for micro total analysis systems. The structure and working principle of the valveless piezoelectric pump with V-shape tube are described. The average flow calculation formula and efficiency formula of the system are developed by analyzing the flow field theoretically. Finite Element Method is applied to the flow field in the V-shape tube to obtain pressure contours of positive and negative flows in it. By comparing the pressure loss coefficients in the V-shape tube, othe diffuser/nozzle parallel connection and Y-shape tube, the first two curves of the ratios of pressure loss coefficient follow the same variation tendency. The reliability of numerical simulation is proved, which provides guidance for the design of piezoelectric pump.
出处
《排灌机械》
2008年第4期30-34,共5页
Drainage and Irrigation Machinery
基金
江苏省高校自然科学研究计划项目(04KJB470026)
关键词
无阀压电泵
扩张/渐缩管
“V”形管
压力损失系数比
有限元法
valveless piezoelectric pump
diffuser/nozzle tube
V-shape tube
the pressure loss coefficient
Finite Element Method
