Richard Steven
Venturi flow meters are popular for being simple, sturdy, reliable and inexpensive devices. Their principles of operation are easily understood. However, traditionally there has been no Venturi meter self diagnostic capabilities. In 2008 and 2009 a generic DP meter self diagnostic methodology was proposed. In this paper these DP meter diagnostic principles are discussed specifically with respect to Venturi meters. In this paper the principles are proven with extensive experimental test results from Venturi meters. A diagnostics screen displaying the diagnostic results real time, first...
Kegel, T. M.
This is the second paper describing a program to organize and analyze the results of a large number of venturi meters calibrated using compressed air. Part four of the ISO 5167 standard specifies discharge coefficient values. The calibration results are organized into four categories based on a qualitative judgment as to how well the calibration fits the ISO coefficients. The database contained 59 venturies when the first paper was published; the current summary is based on 76 calibrations.
Li-jun Sun, Li-xiao Qi, Tao Zhang
Cross-section of Averaging Pitot Tube (APT) flow sensor is a determinant factor in meter performance. In order to improve the performance of the APT flowmeter, three different cross-sections with Flow Conditioning Wing (FCW) were put forward. It was shown by Computational Fluid Dynamics (CFD) numerical simulation and prototype test that the performance of the FCW II cross-section, such as the linearity, the repeatability, and the value of differential pressure generated, is better than those of traditional circle and diamond cross sections. It was shown by prototype test, in the case of the...
Velt I. D., Khavin L. M.,Terekhina N. V.
The simulation model of an electromagnetic flowmeter and its application for metrological characteristics devices analysis is considered.
Chi Wang, He-ming Hu, Tao Meng
It is always a difficult task to measure the flow in large conduits. Ultrasonic flowmeter developed in recent years is a good choice for the large flow measurement, especially for turbine performance testing in hydroelectric plant, because of its convenient installation; but it is not easy to estimate the accuracy of ultrasonic flowmeter, and there is not even a acknowledged estimation method when its installation requirements are not satisfied. Aiming at the accuracy of the ultrasonic flowmeter installed in 3-Gorge power station, both experiment method and CFD method are introduced to...
Fong-Ruey Yang, Yi-Lin Ho, Wen-Bin Wang, Jiunn-Haur Shaw, Tsai-Wang Huang, Jyh-Rong Wu, Zhong-Yong Chen, Yun-Ho Cheng, Zhi-Xiong Su, Trank Li
This paper describes the traceable calibrations from primary standard to on- site natural gas ultrasonic flowmeters. In practice, the National Metrology Laboratory constructed a gravimetric type air-flow calibration system with sonic nozzle array as the working standard in 1993. The flow measurement capacity of this primary standard at 1 bar and 20 °C is from 15 m³/h to 18000 m³/h with operating pressure range from 1 bar to 60 bars. A re-circulating high pressure gas flow measurement facility was constructed at Chinese Petroleum Corp in southern part of Taiwan. The pressure range is also...
Dan-dan Zheng, Tao Zhang, Li-jun Sun, Tao Meng, He-ming Hu, Chi Wang
The downstream flow of 90°single bend was investigated by computational fluid dynamics (CFD). An acoustic transit time flowmeter was exposed to the downstream flow at various positions. Measurement errors with different meter configurations and effects of pipe wall roughness were discussed. Numerical simulation results of three diameter pipes 0.1 m, 1 m and 10 m with increasing the roughness from 0 to 1 mm were presented within Reynolds number (Re) range from 5 × 10 3 to 5 × 10 6 .
He-ming Hu, Chi Wang, Tao Meng
The multi-path ultrasonic flowmeter is a well established method for accurate discharge measurement in large closed conduits. Although multi-path configuration and crossed paths are used to increase measuring accuracy, the error due to flow field distortions can not be ignored. This paper focuses on the numerical approach to estimate the accuracy of ultrasonic flowmeter under the disturbed flow condition. The flow field in the ultrasonic flowmeter can be simulated using FLUENT, and virtual acoustic paths are placed to investigate the flow error, which is the difference between the indicated...
Xian-ju Meng, Shao-feng Li, Zhi Li
This article study the measurement characteristics of the V type elbow meter used CFD approach, the velocity and pressure distributions in the elbow meter were presented. The experiments were carried out in a DN100 pipe,the experimental results show that the flow coefficients of the V type elbow meter is stable,and the relative errors between CFD simulation and experiment are within ± 1.0 ％, the V type elbow meter can satisfy the fluid flow measurement in most industrial applications.
E. von Lavante, J. Yao
Several types of axisymmetric internal configurations were numerically simulated in order to investigate the development of turbulent swirling and non-swirling flows along the axial direction. The governing equations were the Navier-Stokes equations with swirl velocity, requiring the computation of all three velocity components. The turbulence model used in the present work was the quadratic k-ω formulation. Applying the above methods, both swirling and non-swirling flows in a pipe, in a typical Venturi-tube and in an orifice were simulated and the results were analyzed in detail.