Title: Wave tracking method of hydraulic transients in pipe systems with pump shut-off under simultaneous closing of spherical valves
Authors : Zhang, Zhengji
Published in : Renewable Energy
Volume(Issue) : 132
Pages : 157
Pages to: 166
Publisher / Ed. Institution : Elsevier
Issue Date: 1-Aug-2018
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (publication)
Language : English
Subject (DDC) : 620: Engineering
Abstract: The limited wave propagation speed in water permits the propagation of pressure surges in hydraulic transients to be tracked in the time series. This occurs by tracking the primary (F) and the reflected (f) waves. The wave tracking method has been demonstrated to be applicable to highly complex hydraulic systems. The wave propagation induced by passing through a T-junction in the flow complies with the wave conservation laws which concern both the wave reflection and the transmission. It has been shown that all computations can be simply implemented in a computation tool like MS Excel. This considerably ensures both the accuracy and the reliability of computations. At a hydraulic system of Pelton turbines, excellent computational results have been achieved. The application to a highly complex hydraulic system with pump shut-off and the simultaneous closing of a spherical valve also showed excellent results, when compared with the field measurements. The key point in the presented computations is to unify the characteristics of the pump and the spherical valve. The entire computation covers the flow rate in the system, the reverse flow through the pump, the pressure response, the deceleration of the rotational speed and the system oscillations.
Departement: School of Engineering
Organisational Unit: Institute of Energy Systems and Fluid Engineering (IEFE)
Publication type: Article in scientific journal
DOI : 10.1016/j.renene.2018.07.119
ISSN: 0960-1481
1879-0682
URI: https://digitalcollection.zhaw.ch/handle/11475/10708
Appears in Collections:Publikationen School of Engineering

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