Research Papers: Fluid-Structure Interaction

Sensitivity Analysis of Operational Time Differences for a Pump–Valve System on a Water Hammer Response

[+] Author and Article Information
Wuyi Wan

Department of Hydraulic Engineering,
College of Civil Engineering and Architecture,
Zhejiang University,
Hangzhou 310058, China
e-mail: wanwuyi@zju.edu.cn

Fuqiang Li

Department of Hydraulic Engineering,
College of Civil Engineering and Architecture,
Zhejiang University,
Hangzhou 310058, China
e-mail: lifuqiang@zju.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 23, 2015; final manuscript received July 24, 2015; published online August 26, 2015. Assoc. Editor: Jong Chull Jo.

J. Pressure Vessel Technol 138(1), 011303 (Aug 26, 2015) (8 pages) Paper No: PVT-15-1049; doi: 10.1115/1.4031202 History: Received March 23, 2015; Revised July 24, 2015

Pumps and valves are primary power and control devices in water supply piping systems. A collaborative operational scheme is very important for a series pump–valve system to decrease the transient pressure during the startup process. In order to analyze the influence of the operational time differences between the pump and the valve on the transient process, a complicated pump system was numerically simulated using the method of characteristics (MOC). The boundary conditions of the pump and the valve were separately established by equating an auxiliary element in the discrete mesh. The transient pressure, pump speed, and flow were studied for various time differences and the valve opening process for the series pump–valve startup process. Furthermore, an optimal collaborative scheme was presented to prevent inverse rotation and overpressure during the startup process. The results show that a reasonable time-lapse and fast opening can prevent the backward flow and reverse rotation, as well as control the transient maximal pressure during the system startup process.

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Fig. 1

Basic series pump–valve unit

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Fig. 2

Schematics of high lift delivery system with four series pump–valve units

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Fig. 3

Separate boundary model of the series pump–valve system

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Fig. 4

Selections of the pump boundary model

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Fig. 5

Flow chart of the control valve

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Fig. 6

Transient pressure and flow process induced by the system startup (Tsd = −10 s)

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Fig. 7

Transient pressure and flow process induced by the system startup (Tsd = 10 s)

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Fig. 8

Extreme transient pressure ratios with various operational time differences

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Fig. 9

Maximal dimensionless reverse speeds

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Fig. 10

Maximal dimensionless discharge backflow

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Fig. 11

Transient pressure processes for various valve opening speeds

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Fig. 12

Transient process of a system startup in the conventional scheme

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Fig. 13

Transient process of system startup in the proposed scheme



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