|
|
|
| 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.
|
|
|
|
|
|
［1］ Dahlstrom M J. V-Cone Meter: Gas Measurement for the Real World［C］//North Sea Flow Measurement Workshop, Peebles, Scotland. 1994.
［2］ Stewart D G, Reader-Harris M, Peters J W. Derivation of an Expansibility Factor for the V-Cone Meter［C］//Flow Measurement International Conference, Peebles, Scotland, UK. 2001.
［3］ Peter R J W, Reader-Harris M, Stewart D G. An experimental derivation of an expansibility factor for the V-Cone and Wafer meter［C］//North Sea Flow Measurement Workshop, Kristiansand, Norway. 2001.
［4］ 徐英，杨会峰，张涛. 内锥流量计可膨胀系数实验研究［J］. 计量学报, 2008,29(5):457-460.
［5］ BRITISH STANDARD ISO/TR 5168：1998，Measurement of fluid flow - Evaluation of uncertainties［S］.1998. |
|
|
|
2013, Vol. 34 
