容积式流量计的性能包括精度、误差和量程,其优劣通过流量系数体现。文中从流量计原理入手,研究了流量系数的变化规律;分析了流量系数变化的形成机理;提出了流量系数与设计尺寸、制造精度、压力损失以及摩擦特性等因素相关的理论观点;并最终总结了改善容积式流量计性能的途径。 Volumetric flow meter performance, including accuracy, error and range, the pros and cons of the flow coefficient reflected. In this paper, the principle of flowmeter is studied, the variation rule of flow coefficient is researched, the formation mechanism of flow coefficient is analyzed, and the theoretical viewpoint that the flow coefficient is related to design dimension, manufacturing precision, pressure loss and friction characteristic is also proposed. Finally, The way to improve the performance of volumetric flowmeter.