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| Numerical Study on The Influence of Pipeline Valves on Liquid Flow Characteristics |
| JI Jie-qiang1,2,ZHENG Jian-ying2,YU Song-qing1,WU Xiao-jie1,CHENG Le-ming2 |
1. Zhejiang Province Institute of Metrology, Hangzhou, Zhejiang 310018, China
2. State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China |
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Abstract To investigate the influence of valve opening on the flow characteristics, the 3D calculations are carried out to simulate a circular pipe containing a ball valve by CFD method. The opening and closing process of the valve are modeled by the dynamic grid technology. Firstly, the flow characteristics inside the pipe with the valve fully opening are studied, and the results are compared with the experimental data from literature. It shows that using the standard k-ε turbulence model could get more accurate results. Furthermore, the flow field distributions at different valve opening degrees are investigated. The simulation results show that the change of valve opening degree has obvious influence on the downstream flow field. However, the disturbance will gradually weaken along the flow direction, and the flow field return to uniform distribution at the critical distance. Flowing through the valve, the liquid flow is separated to form a high velocity region and low velocity region at the cross section. For different valve opening degree, the flow velocity stratification is different. With the decrease of opening degree, the critical distance first increases and then decreases, and the maximum critical distance appears at 50% opening degree.
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