Influence of steam generator outlet pipe parameters on inlet flow field of nuclear reactor coolant pump
LIU Cong1,WANG Yuehui1,MA Tengyue1,WANG Pengfei2,XU Zhongbin1*,RUAN Xiaodong3
1. Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2. School of Engineering, Zhejiang University City College, Hangzhou, Zhejiang 310015, China; 3. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, Zhejiang 310027, China
Abstract:According to the scale model experiment, it is found that the outlet pipe of the steam gene-rator(SG)has an obvious non-uniform inflow. In order to study the influence of the SG outlet pipe parameters on the inlet flow field of nuclear reactor coolant pump(RCP), a unified model of the SG lo-wer head and the RCP was established, and the three-dimensional flow field was simulated by CFD method. The results show that the outlet pipe length of the SG has a great influence on the inlet flow field of the RCP, and the influence is particularly obvious when the inlet pipe is shorter. With the increase of the pipe length of the SG, the influence gradually decreases, and the inlet flow field of the RCP tends to be stable. The location of the outlet pipe of the SG has little influence on the flow field turbulence of the RCP inlet, and the development trend of the flow field in the different positions of the tube is similar, but it will have a great impact on the position of the high-speed and the low-speed regions of the flow field. The flow field in the outlet pipe of the SG is extremely disordered, and there is a large recirculation zone at the beginning. With the development of the flow field, the reflux phenomenon disappears around 350 mm from the SG outlet, and then the flow field becomes stable gradually, but the eccentricity of the flow field will not disappear.
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