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| Analysis of water hammer characteristics in pressurized pipeline based on CFD |
| WANG Yong1,2*, XIONG Wei1, DING Zhiyao1, PI Qin1, YUAN Xiao3, LIU Houlin1, LI Ming1 |
| 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Department of Precision Manufactu-ring Engineering, Suzhou Vocational Institute of Industrial Technology, Suzhou, Jiangsu 215104, China; 3. Jiangsu Zhenhua Haike Equipment Technology Co., Ltd., Taizhou, Jiangsu 225500, China |
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Abstract To further reveal the hydraulic transition process of pipeline system under different flow rates conditions and reduce the harm of water hammer, the simplified straight pipeline system was taken as the research object, and the valve closing water hammer was studied by numerical simulation. Three-dimensional CFD numerical calculation of valve closing water hammer with continuous water column in straight pipeline system was carried out based on SST k-ω turbulence model, and the VOF multiphase flow model and Schnerr-Sauer cavitation model were used to study the water hammer phenomenon with water column separation in straight pipe system, and the transient flow characteristics of the straight pipe system under different steady-state initial velocities and valve closing schemes were obtained. The results show that when the steady-state initial velocity is small, water column separation will not occur, but water column separation will exist when the steady-state initial velocity is large, the propagation of water hammer wave can be approximately divided into four stages, the water hammer pressure will gradually decay due to dissipation, and greater water hammer pressure will be caused when the water column is closed. The steady-state initial velocity and valve closing scheme have a great influence on the water hammer pressure, the water hammer pressure increases with the increase of steady-state initial velocity, and the maximum water hammer pressure is approximately linear with the steady-state initial velocity. When the valve is closed instantaneously, the water hammer pressure is the maximum. When the valve is closed slowly first and then fast, the water hammer pressure is the minimum. Thus, the study has a certain guiding effect on water hammer protection of pressurized pipeline.
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Received: 19 November 2021
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