The Impact of Expansibility Factor of V Cone Flowmeters on Aerometry
LIU Xing-xun1,2, ZHANG Tao1, BAI Long1
1.School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China;
2.Beiing Institute of Radio Metrology and Measurement, Beijing 100854, China
Abstract：The experiments about V cone flowmeter both in the water flux standard instrument using weighing method and the gas flow calibration system based on the critical flow nozzles and positive pressure method were carried out. Based on the experiment value and the uncertainty mathematical model of fitting coefficient on the least squares method, uncertainty has been evaluated and compared between the expansibility factor calculation formulas proposed by NEL and Xu Ying respectively. The result can be concluded that the uncertainty about formulas mainly come from the error of fitting coefficient. After analysis of the prediction of expansibility factor respectively by traditional V cone formula and wafer V cone formula, the optimal structure of v cone is very important for the standard V cone flowmeter.
刘星汛, 张涛, 白龙. V锥流量计可膨胀系数对气体测量的影响分析[J]. 计量学报, 2013, 34(4): 334-338.
LIU Xing-xun, ZHANG Tao, BAI Long. The Impact of Expansibility Factor of V Cone Flowmeters on Aerometry. Acta Metrologica Sinica, 2013, 34(4): 334-338.
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2013, Vol. 34 
