中文摘要：

为使半球缺阻流体无阀压电泵在医疗、保健、航空航天器等领域得到更好的应用，需对半球缺阻流体无阀压电泵的工作特性进行相关的研究分析。该文首先对半球缺阻流体无阀压电泵的结构和工作原理进行了分析，并对泵内流阻特性进行理论分析；同时，采用有限元软件对半球缺阻流体无阀压电泵内部流场进行了模拟分析，结果表明，泵内流体正反向流时的流速随半球缺半径的增大呈递减趋势，泵腔内部的压强变化平缓。实际加工了样泵及多组不同半径的半球缺组并进行了实验，结果表明，泵的最大输出流量随半球缺半径增大而减小，在工作电压为150V，半球缺半径为4．0mm时，泵的最大输出流量值为121．4mL／min，验证了半球缺能作为无阀压电泵的无移动部件阀及半球缺阻流体无阀压电泵的有效性。

英文摘要：

In order to make the valve-less piezoelectric pump with hemisphere-segment bluff-body meet well with the needs in such areas as medical treatment and aeronautics and astronautics, the performance of this pump needs to be analyzed. Firstly, the structure and working principle of valve-less piezoelectric pump with hemisphere-segment bluff-body are introduced. Secondly, the flow resistance of the pump is analyzed theoretically. A simulation analysis of the flow field of this pump is carried out by using the finite method. From the result of simulation,we can found that during the positive and negative direction the fluid＇s velocity decrease with increasing hemisphere of radius,and the amplitude of variation of pressure in the chamber is gentle. Finally we manufactured a sample pump and some se- ries of hemisphere-segment bluff-body with different radius. The experiment results show that the maximum output flow rate decreases with increasing hemisphere of radius,and the maximum output flow rate is 121.4 mL/min when the radius of the hemisphere-segment bluff-body is 4.0 mm and the voltage is 150 V. These results demonstrate the hemisphere-segment bluff-body can be used as no-moving-parts valve, and the feasibility of this pump.