Philippe Averlant, Pascal Lacipiere, Jean-Marie David
This paper describes the new LNE 5 kN.m deadweight torque standard bench. Information on the design, development, and commissioning of this standard are given. Its design is described focusing on mechanical and metrological characteristics. In particular, three components, developed by LNE, are described: First, the double arm lever, one for deadweight force transmission and the other for localization of this force Then, the air bearing based on used of porous material. Finally, the system should enable us to avoid the wrinkling of the tape related to the positioning of the force at the...
TC3 Conference 2014
· TC3
· 2014
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Paththage Priyadarshana, Drew Weaver, Dale Goodson, Peter Syrnyk
Applications for liquid ultrasonic Custody Transfer flow measurement are traditionally limited to flow ranges within the meter’s performance capability related to the viscosity of the fluid, particularly in the low Reynolds number region where the flow range is across the laminar, transitional and turbulent flow regimes. This paper discusses new methodology by which the flow meter’s performance can be extended into lower ranges of Reynolds numbers for viscous flows while maintaining the close tolerances needed for Custody Transfer measurement applications. The methodology includes the...
He-ming Hu, Tao Meng, Feng Gao, Liang Zhang, Chi Wang
Geometric parameter measurement system for multi-path ultrasonic flowmeters based on Leica total station has been established, which can directly measure the 3D coordinates of the conduit points and sensor points and automatically calculate geometric parameters of the flowmeter. Compared with the traditional method using the theodolite and steel tape, the first advantage of this system is the high efficiency and good accuracy, and the second is the path heights can be re-measured after the sensor mounted. Cylinder fitting is its key problem. Lukács algorithm is introduced for the cylinder...
P. Klason, O. Büker, P. Lau, O. Penttinen, K. Mattiasson, T. Lederer, K. Tawackolianb, J. Frederiksenc, A. K. Niemannc, P. Milotad
In the ‘Metrology for improved power plant efficiency’ project the Reynolds dependence of four flow meters used for feed water flow measurements were investigated. The four flow meters were ultrasonic, inductive, orifice plate and Venturi tube flow meter. The measurements were performed up to 90 °C to study the temperature dependence of the meters. An extrapolation model up to 230 °C was developed to measure the feed water flow with an uncertainty in the range of 0.3 % – 0.5 %. The influence of a double bend out of plane disturbance on the meters was also investigated. Some meters showed a...
N. Furuichi, K. H. Cheong, Y. Terao, S. Nakao, K. Fujita, K. Shibuya
A tap effect of a discharge coefficient of a throat tap flow nozzle based on PTC 6 is investigated by measuring the discharge coefficient in 1.8 × 10 5 < Re d < 1.4 × 10 7 . The measurement error of the differential pressure, when it is normalized by a wall shear stress including the effect of roughness caused by the hole of a tap, is described as a function of tap Reynolds number based on the friction velocity and the tap diameter. The equation of the discharge coefficient of the flow nozzle is proposed, which consists of the two terms that can be physically evaluated, the theoretical...
Hongbing Ding, Chao Wang, Yakun Zhao
ISO toroidal-throat nozzle with a divergent section differs from the nozzle used for the theoretical research of Hall & Geropp and is highly likely to affect the flow field and discharge coefficient. In this paper, the influence of ISO-type conical divergent section on discharge coefficient was analyzed basing on inviscid transonic flow model and laminar boundary layer respectively. Two coordinate systems namely cylindrical coordinates and curvilinear coordinate were applied to research the velocity distribution of core flow and calculate displacement thickness. The results indicated the...
Liang Zhang, Heming Hu, Tao Meng, Chi Wang
Experimental study of multi-path ultrasonic flowmeters measurement accuracy in complex flow fields was carried out in the water flowrate standard facility of National Water Large Flowrate Measurement Station. Several muti-path ultrasonic flowmeters with different path arrangement were studied. The flow disturbances were created by bend, tapered pipe, diverging pipe and butterfly valve. By studying the measurement errors of different types of ultrasonic flowmeters, it is confirmed that the cross plane ultrasonic flowmeter is more adaptable to the complex flow field. The installation angle of...
Stéphane Fischer, Claude Rebattet, Damien Dufour
Measurement of fluctuating flows in hydraulic machines is an ongoing challenge for which classical flow meter technologies (Differential pressure, Magnetic, Turbine and Propeller) are not well adapted. The ultrasonic pulsed Doppler technique allows to measure instantaneous velocity profiles in a very short time. This paper presents the performances of the ultrasonic velocity profiler UB-Lab to achieve faster velocity flow measurement through hydraulic pipes. The system has been optimized (transducer frequency, beam angle, parameters of sequencing) in order to reduce effect of wall echoes, to...
Moritz Leopoldo Cordova Murillo, Thomas Lederer
Due to its high repeatibility ultrasonic flow meters (UFMs) are ideqm instruments for interlaboratory comparisons. The present paper attempts to improve the performance of UFM for interlaboratory comparisons by estimating weighing factors that reduce the instrinsic errors of this technology. The results have been tested with a DN500 five parallel path time of flight (TOF) UFM at a Bilateral comparison within the PTB. Oustanding results have been accomplished.
Benjamin E. McDonald, Lei Sui
Compensation for ultrasonic flow measurement has increasingly become the trend for applications that call for higher accuracy and tighter repeatability. Temperature is a variable that tends to have a significant impact on performance. Geometric dimension changes due to thermal expansion and contraction, as well as fluid dynamics, are impacted by temperature and thus have an influence on overall system accuracy. This paper presents a new method for measuring temperature by taking advantage of well characterized material properties that change with temperature and utilizing existing system...