Analysis of the effect of valve characteristics on hydraulic transition process of pumping station
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Abstract:
The control valve is used to protect water pump from falling back when pump is stopped accidentally.But it is inventible to cause water hammer which is unfavorable to the water pipe line.Therefore,valve characteristic which can not only effectively prevent the pump from runaway but is also valid for controlling the valve closure water hammer should become the research priorities .Firstly,an ideal relationship model between the nondimensional flow coefficient of pump outlet valve and relative valve opening was theoretically derived.Then,through the hydraulic transient simulations of practical engineering,several typical valve characteristics were compared,and the proposed water hammer control effect of ideal valve characteristic was evaluated.The results showed that the control valve characteristic was an important factor affecting the hydraulic transient of pump station,and the ideal characteristic should be concave.The pump outlet valve with convex characteristic should not be selected because the maximum outlet pressure was large.When the pump outlet valve had ideal concave characteristic,the maximum pressure at the valve outlet decreased significantly under the same valve closing condition.In addition,the ideal valve was also beneficial for improving the minimum pressure along the pipeline and prevents the form of negative pressure.The ideal characteristic model of control valve can provide important theoretical support for the selection of pump outlet control valve in water diversion project.
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