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| Theoretical Analysis of Integration Error of Ultrasonic Flowmeter in the Disturbed Flow Condition |
| HU He-ming,MENG Tao,WANG Chi |
| National Institute of Metrology, Beijing 100013 |
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Abstract The integration error of the ultrasonic flowmeter is calculated in some theoretical disturbed flow profiles. The influence of the flow structure is analyzed, and its statistical regularity to the path number is studied. The results show that the integration error is directly related to the complexity of the flow profiles. It is believed from statistical analysis that the integration error decreases successively with the number of paths increasing, but not true for the certain flow profiles. The OWICS scheme has better accuracy than the Gauss-Jaccobi scheme, especially when the number of paths is limited.
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［1］Moore P I, Brown G J, Stimpson B P. Ultrasonic transit-time flowmeters modelled with theoretical velocity profiles ［J］. Mesurement Science and Technology, 2000, 11(12): 1802-1811.
［2］Brown G, Augenstein D, Cousins T. Velocity profile effects on multipath ultrasonic meters［C］//6th International Symposium on Fluid Flow Measurement, Querétaro, Mexico, 2006.
［3］Tresch T, Gruber P, Staubli T. Comparison of integration methods for multipath acoustic discharge measurements［C］// 6th International Conference on IGHEM, Portland, USA, 2006.
［4］Grego G, Muciaccia F. Choice of the best position of 4 path acoustic systems in circular sections downstream curves or with inadequate straight pipes and disturbed speed profiles［C］//7th International Conference on IGHEM, Milan, Italy, 2008.
［5］Moore P I, Piomelli U, Johnson A N, et al. Simulations of ultrasonic transit time in a fully developed turbulent flow using a ray-tracing method［C］//22nd North Sea Flow Measurement Workshop, Peebles, Scotland, 2002. |
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2011, Vol. 32 
