排灌机械工程学报
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排灌机械工程学报  2016, Vol. 34 Issue (9): 748-754    DOI: 10.3969/j.issn.1674-8530.15.0220
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核主泵前腔间隙对性能影响的数值计算
程效锐1,2, 包文瑞1
1.兰州理工大学能源与动力工程学院, 甘肃 兰州 730050; 2.甘肃省流体机械及系统重点实验室, 甘肃 兰州 730050
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
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摘要 基于相对坐标系下的雷诺时均N-S方程和RNG k-ε湍流模型,采用SIMPLE算法,以清水为介质,对AP1000核主泵模型进行数值模拟.通过改变压水室与前腔间隙设计出4种不同方案,并对各种方案下泵内流动进行全三维数值模拟,获得不同间隙下模型泵轴向力和前腔内流动变化趋势和规律.计算结果表明:在工作流量(0.8Qd~1.2Qd)下,间隙变化对泵扬程和效率都有一定影响;核主泵前腔间隙变化导致泵最高效率点位置相对于设计工况发生偏移,其偏移方向和偏移程度与间隙变化无明显对应关系;在设计工况(1.0Qd)下,泵效率在间隙为0.6 mm时高于其他间隙,相比间隙为1.8 mm时提高了1.66%;在1.2Qd工况下,间隙为1.8 mm时效率高于其他间隙,相比间隙为2.4 mm时泵效率提高了2.17%;从全工况看,间隙对轴向力影响较小,轴向力随着流量的增大呈单调递减趋势,其计算值明显低于试验值,但随着流量的增加,理论计算值的相对误差有减小趋势.
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程效锐
包文瑞
关键词核主泵   间隙   轴向力   数值计算     
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.
Key wordsreactor coolant pump   gap   axial force   numerical calculation   
收稿日期: 2015-10-12;
基金资助:国家自然科学基金资助项目(51469013)
通讯作者: 包文瑞(1988—),男,甘肃白银人,硕士研究生(baowenruity@163.com),主要从事流体机械内部流动理论研究.   
作者简介: 程效锐(1972—),男,甘肃兰州人,副教授(cxr168861@sina.com),主要从事流体机械数值模拟及优化设计方法研究.
引用本文:   
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 Xiao-Rui-,,BAO Wen-Rui-. Numerical calculation of influence of gap between impeller shroud and diffuser side wall on performance of reactor coolant pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(9): 748-754.
 
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