中文摘要：

半球缺群相比于单一的半球缺具有更好的正、反向流体阻力不等特性，为分析其流阻变化对泵送性能的影响，对泵腔内半球缺群的行数、列数及行列间距的变化进行了研究。推导出半球缺群的正、反向阻力系数作用规律，流阻试验及泵流量试验验证了该规律分析计算流阻及泵流量的可行性；在有限行、列间距范围内，计算及试验流阻差及泵流量均随半球缺群行数、列数的增加而增加；在驱动电压及频率为120V、6Hz时，半球缺群3×4、4×3、4×4行列分别获得45．5mL／min、46．2mL／min、47．75mL／min泵流量；理论与试验流量的最大偏差为23．23％。研究表明，半球缺群的流阻作用规律可以用来分析及预测泵流量；增加行数及列数并适当控制行、列间距均能提高泵流量，且增加行数比增加列数能获得更好的输出效果。

英文摘要：

Compared with single hemisphere-segment, hemisphere-segment group has better forward and reverse unequal fluid resistance properties. In order to analyze the impact of flow resistance variation on pumping performance, the changes of row number, column number and intervals for hemisphere-segment group in pump chamber were studied. Forward and reverse flow resistance coefficient formulas of hemisphere-segment group were derived and verified by the flow resistance experiment and flow rate experiment of the pump. In the range of limited row and column intervals, the experimental and theoretical flow resistance difference and flow rate increased along with the increase of row and column numbers. At the driving voltage of 120 V and the driving frequency of 6 Hz, the valve-less piezoelectric pumps with hemisphere-segment group in rows and columns 3 ×4, 4 × 3, 4 ×4 respectively obtained the pump flow rates of 45.5 mL/min, 46.2 mL/min, 47.75 mL/min. The maximum deviation of theoretical relative to experimental flow rate was 23.23%. The results showed that the flow resistance law of hemisphere-segment group could be used to analyze and predict the pump flow rate; the pump output flow rate can be increased by increasing the row number or column number meanwhile properly limiting the row interval and column interval. The better output performance can be obtained by increasing row number than column number.