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Title: Flomeko 2016, Sydney, Australia, September 26 - 29, 2016 Page 1 Investigation On Error Model Of Turbine Flowmeter S Based On The Reynolds Number
Author: Han Zhang Li Jia Chunhui Li Peijuan Cao
Source: Flomeko 2016
Year Published: 2016
Abstract: The meter error is an important index of flow characteristics for the turbine flowmeter s , associated with flow rate and gas pressure. The model for meter error is the key link to decrease the fitting uncertainty faced by the non - fixed usage of turbine flowmeter s . 4 sets of turbine flowmeters (Dn 100) were selected as master meters applied in measurement high pressure (up to 2.5MPa) gas flow is developed at NIM by the method of close loop standard facility . The investigation were carried out by the 4 sets of turbine f lowmeters and the results showed that : the curve of meter error mainly shows a certain rule with the Reynolds number at different pressures but might be obviously spread at low flow rate but low pressure. Starting from the fact of the physical model that for a constant flow rate al l forces (torques) are in equilibrium, the error model of turbine flowmeter s (named NIM - 2015) was presented. It can reflect the characteristics of the curve of meter error . With comparison with the uncertainty based on the NIM - 2 014 model, the uncertainty based on the NIM - 2015 model of the 4 turbine flowmeter s for the non fixed point usage could be lower than 1% ( k 2). To prove the model the consistency of the turbine flowmeters was verified and the result suggests that the model is reasonable

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