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Computing research of the water hammer pressure in the process of #br# the variable speed closure of valve based on UDF method

GUO Lan-lan1,2, GENG Jie1, SHI Shuo1,3, YUAN Fei1, LEI Li1, DU Guang-sheng1*   

  1. 1.School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China;
    2.College of Mechanical and Electronic Engineering, Shandong University of Science and Technology,
    Qingdao 266590, Shandong, China; 3.Key Laboratory of Renewable Energy Utilization Technology in Building of
    National Education Ministry, Jinan 250101, Shandong, China
  • Received:2014-01-06 Online:2014-03-20 Published:2014-05-29

Abstract: The rotation process of ball valve was simulated by using the sliding grid technology of Fluent software, and the water hammer pressure caused by the suddenly closed of the ball valve in the pipeline was calculated. In the calculation, the standard turbulent model was used with considering the compressibility of water. The rotational speed of ball valve was controlled by UDF. The influence of valve’s closure way and time on water hammer pressure were analyzed. Results show that when the valve is closed at a constant speed, the increase of closing time can reduce the water hammer pressure, and the effect is evident before 0.3s; when the valve closing time is fixed, the deceleration way can effectively reduce the water hammer pressure.

Key words: water hammer, numerical simulation, variable speed closure, sliding mesh

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