Abstract：The numerical simulation and experiments are used to research internal flow characteristics of momentum gas flowmeter. The changing characteristic of drag coefficient for force-summing element is obtained, the influence of the structure and installation of force-summing element on the measurement performance are studied. The research results show the drag coefficient of momentum gas flowmeter changes greatly and the relationship between drag coefficient and Reynolds should be fitted, the rectangular force-summing element should be selected first because the fitting formula of drag coefficient for rectangular force-summing element has the least error. The maximum error between fitting formula and experimental data is 0.32%. Research results also show the installation error of force-summing element is no more than 0.32% and has little influence on the measurement accuracy and the momentum flowmeter is suitable for on-line installation.
刘正刚,杜广生,刘丽萍. 动量式气体流量计内部流场特性与测量性能研究[J]. 计量学报, 2019, 40(1): 124-129.
LIU Zheng-gang,DU Guang-sheng,LIU Li-ping. Study on Internal Flow Field and Measurement Performance of Momentum Gas Flowmeter. Acta Metrologica Sinica, 2019, 40(1): 124-129.
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2019, Vol. 40 
