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Ningbo, China

Du Z.,China Jiliang University | Zhang K.,China Jiliang University | Yao L.,Ningbo Water Meter Co. | Tu C.X.,China Jiliang University | And 2 more authors.
AIP Conference Proceedings | Year: 2011

Firstly, a three-dimensional model of WS-80 vertical Woltmann water meter was created according to its geometrical parameters. And then the finite volume based SIMPLEC method and two different turbulence models (κ-ε RNG and κ-ε realizable) are used to get the internal flow of Water Meter, respectively. Finally, the details of flow, such as pressure loss, velocity vector and pressure distribution of flow field are derived. In addition, the numerical simulation of pressure loss was compared with experimental data. It has been found that numerical simulation results can really reflect the complicated internal flow of water meter, and they can be used as the guidance for the design and optimization of vertical Woltmann water meter. © 2011 American Institute of Physics. Source


Chen H.,China Jiliang University | Zhang K.,China Jiliang University | Yao L.,Ningbo Water Meter Co. | Zhang H.J.,China Jiliang University
Advanced Materials Research | Year: 2013

Flow field inside an ultrasonic water meter of time-difference-type are numerically simulated at several flow rates. Linear mean velocity (LMV) averaged along the line between the transmitting transducer and the receiving one, and the surface mean velocity (SMV) averaged in the cross section of the reducing-type flow passage, and the flow correction coefficient are calculated with the flow field data obtained by the simulation. It's found that the values of flow correction coefficient for the reducing-type meter channel flow are quite different from that for a fully developed pipe flow, and are related to the flow rate or Reynolds number. © (2013) Trans Tech Publications, Switzerland. Source


Nwm

Trademark
Ningbo Water Meter Co. | Date: 2011-07-05

Water meters; distance measuring apparatus; gas meters; tool measuring instruments; electric meters.


Yao L.,Ningbo University | Yao L.,Ningbo Water Meter Co. | Wang R.-D.,Ningbo University | Zuo F.-Q.,Ningbo Water Meter Co. | Luo Y.,Ningbo University
Jiliang Xuebao/Acta Metrologica Sinica | Year: 2013

As the fluid in pipe is in different Reynolds number, the average fluid velocity along the acoustic path measured by the ultrasonic water meter and the mean axial fluid velocity has significant nonlinear. Accorded to the different distribution state of measured fluid flow in the pipe, a new segmented correction method of flow measurement characteristics is proposed. By establishing a cutting point in critical area, the correction method of constant coefficient is adopted at the laminar, and that of linear equation fitting is used at the turbulence and transition flow respectively. Experiments show that this method is feasible. Source


Yao L.,Ningbo Water Meter Co. | Yao L.,Ningbo University | Wang R.-D.,Ningbo University | Zuo F.-Q.,Ningbo Water Meter Co. | Wang X.-X.,Ningbo Water Meter Co.
Jiliang Xuebao/Acta Metrologica Sinica | Year: 2014

The evaluation index of ultrasonic water flow detection transducer is an important aspect for reflecting the transducer operational performance. The research details about the transducer evaluation index, evaluation index test method and performance test device were described. The performance and influence quantity test of the transducer has be done using a self-restraint transducer performance test device. The effective ways and means have be provided about ultrasonic water flow detection transducer screening, matching and quality control. Source

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