The effect of static and rotor clearance ratio on hydraulic performance of nuclear main pump
CHENG Xiaorui1,2, WEI Yanqiang1*, WU Chao1, LIU He1, WANG Kun1
1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Key Laboratory of Fluid Machinery and Systems, Gansu Province, Lanzhou, Gansu 730050, China
Abstract：Based on three-dimensional incompressible fluid N-S equations and RNG k-ε turbulence model, numerical calculations and experiments were used to calculate the three-dimensional turbulent flow field of a mixed-flow nuclear main pump hydraulic model under design conditions. The influence of the clearance ratio Δδ on the hydraulic performance of mixed-flow nuclear main pump model and internal flow field was studied. The results show that in the chosen range of Δδ, the total head and efficiency of the pump increase first and then decrease under the design flow condition as Δδ gradually increasing. When the gap ratio is Δδ=3.1, the total head and efficiency of the pump have a maximum value; The change of the gap ratio has a great impact on the hydraulic loss of the guide vanes and the pressurized water chamber. The hydraulic loss is the largest when Δδ=2.2 in guide vane, and the hydraulic loss is the largest when Δδ=5.8 in pressurized water chamber,When the gap ratio Δδ is 3.1-4.0, the loss in the guide vanes and the pressurized water chamber is small. When Δδ gradually increases, the relative velocity distribution of the impeller outlet and the inlet of the guide vane tends to be consistent. The relative velocity is basically monotonously decreasing from the front shroud flow line to the rear shroud flow line. The distribution of relative velocity at points of the outlet of impeller and inlet of guide vane is the most reasonable when the clearance ratio is 3.1. This result can be used to understand the internal flow field characteristics of the mixed flow nuclear main pump hydraulic model, and provide a useful reference to optimizing design of high efficient hydraulic model.
程效锐,魏彦强*,吴超,刘贺,王堃. 动静转子间隙比对核主泵水力性能的影响[J]. 排灌机械工程学报, 2020, 38(10): 979-984.
CHENG Xiaorui,WEI Yanqiang*,WU Chao,LIU He,WANG Kun. The effect of static and rotor clearance ratio on hydraulic performance of nuclear main pump. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(10): 979-984.
