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| The Theoretical Research and Experimental Testing on Elbow Flow Meter in High Precision |
| LI Shao-feng1,XUE Gui-jun1,MENG Xian-ju1,WANG-Chi2,LI Zhi1 |
1.Hebei United University, Tangshan, Hebei 063000, China;
2.National Insitute of Metrology, Beijing 10013, China |
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Abstract The measurement accuracy of elbow flow meter is not only related to the geometry size precision of the sensor itself in diameter, curvature radius, ratio of curvature radius and diameter, and the position of pressure tap , but also related to the condition for resting, according to the calculating N-S equations to testing elbow flow meter in theory level. Especially, the condition of the application circumstance, such as the deflection angle of installation that generated by the elbow flow and the straight section in both in front and rear sides, the consistency between diameter of straight section and the pipe diameter of itself, would influence the precision of the elbow flow meter in application as well. According to the factors motioned above, by repeatedly testing the elbow flow meter which contains straight section itself machined internally with integral NC, it could be proved that the accuracy of the elbow flow meter could reach 0.5 percent under the criteria in 2σ. Meanwhile, for the circumstance in various pipe diameters, the flow factor performed in good consistency as well.
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2013, Vol. 34 
