Numerical calculation of influence of gap between impeller shroud and diffuser side wall on performance of reactor coolant pump
CHENG Xiaorui1,2, BAO Wenrui1
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：The numerical simulations of flow of water in AP1000 reactor coolant pump model are performed based on the Reynolds averaged N-S equations and RNG k-ε turbulence model by using SIMPLE algorithm. Firstly, the size of the gap between the impeller shroud and the diffuser side wall is designed with four values. Secondly, the flow field in the pumps with these sizes are simulated. Finally, the axial thrust and flow structures in the gap and collector are obtained and discussed under various gap sizes. The results show that the gap size has a certain impact on the pump head and efficiency in a range of 0.8Qd-1.2Qd flow rate. The change in gap size can cause a shift of best efficiency point from the design point, but the shift scale and direction do not correlate with the gap size evidently. Under the design condition, the pump efficiency at 0.6 mm gap is better than the others, and increased by 1.66% compared with 1.8mm gap. Under 1.2Qd flow condition, the pump is more efficient at 1.8 mm gap than at other gaps, and the pump efficiency is improved by 2.17% compared with 2.4 mm gap. Under all working conditions, the gap size has less influence on the axial thrust which shows a monotonic decreasing trend as the flow rate increases. The analytical axial thrust is much lower than the tested value obviously. But with increasing flow rate, the analytical axial thrust approaches the measurement.
程效锐,, 包文瑞. 核主泵前腔间隙对性能影响的数值计算[J]. 排灌机械工程学报, 2016, 34(9): 748-754.
CHENG Xiaorui,, BAO Wenrui. Numerical calculation of influence of gap between impeller shroud and diffuser side wall on performance of reactor coolant pump. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(9): 748-754.
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