轴流式循环泵自流特性研究
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摘要
基于试验测试和数值计算对轴流式循环泵的自流特性进行研究,获得了自流转速、自流损失和损失系数随自流流量的变化规律,初步揭示了自流工况下轴流式循环泵内的流动规律.研究表明:轴流式循环泵的自流转速与自流流量成线性递增关系,设计流量下自流转速约为设计转速的48.6%;自流损失与自流流量成指数递增关系,自流损失系数随自流流量的增加呈先快速下降后趋于稳定的变化趋势;导叶和叶轮内的自流损失分别占整泵自流损失的54.4%和36.5%,导叶工作面发生的大尺度流动分离现象是决定轴流式循环泵自流损失大小的主要因素.研究工作为轴流式循环泵自流转速的预测和自流特性的优化提供了有益的参考.
Based on the experimental and numerical methods, the characteristics of artesian flow in axial circulating pump have been studied. The relationships between artesian flow rate and automatic rotation speed, flow loss, flow loss coefficient in artesian condition were obtained respectively and the flow pattern was revealed preliminarily. The results show that the automatic rotation speed tends to increase linearly as artesian flow rate rises. The automatic rotation speed at design flow rate is about48.6% of design value. The flow loss tends to increase exponentially as artesian flow rate rises. The coefficient of flow loss decreases rapidly with the increase of artesian flow rate and then tends to be stable. The flow loss in impeller accounts for 36.5% of pump and the guide vane takes 54.4%. The large scale separation occurred above pressure surface of guide vane is the major factor to flow loss of axial circulating pump in artesian condition. The research achievements are helpful to provide some reference for prediction of automatic rotation speed and optimization of flow resistance in circulating pump.
Based on the experimental and numerical methods, the characteristics of artesian flow in axial circulating pump have been studied. The relationships between artesian flow rate and automatic rotation speed, flow loss, flow loss coefficient in artesian condition were obtained respectively and the flow pattern was revealed preliminarily. The results show that the automatic rotation speed tends to increase linearly as artesian flow rate rises. The automatic rotation speed at design flow rate is about48.6% of design value. The flow loss tends to increase exponentially as artesian flow rate rises. The coefficient of flow loss decreases rapidly with the increase of artesian flow rate and then tends to be stable. The flow loss in impeller accounts for 36.5% of pump and the guide vane takes 54.4%. The large scale separation occurred above pressure surface of guide vane is the major factor to flow loss of axial circulating pump in artesian condition. The research achievements are helpful to provide some reference for prediction of automatic rotation speed and optimization of flow resistance in circulating pump.
引文
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[2] WU Huixuan, Miorini R L, Katz J. Measurements of the Tip Leakage Vortex Structures and Turbulence in the Meridional Plane of an Axial Water-jet Pump[J]. Experiments in Fluids, 2011, 50(4):989-1003
[3]李忠,杨敏官,姬凯,等.轴流泵叶顶间隙空化流可视化实验研究[J].工程热物理学报,2011, 32(8):1315-1318LI Zhong, YANG Minguan, JI Kai, et al. Visualization Research on Cavitating Vlow in Tip Clearance of Axialflow Pump[J].Journal of Engineering Themophysics,2011, 32(8):1315-1318
[4] LI Yaojun, WANG Fujun. Numerical Investigation of Performance of an Axial-flow Pump with Inducer[J]. Journal of Hydrodynamics, Ser B, 2007, 19(6):705-711
[5]孟清正,周少伟,刘峻华,等.船用海水自流循环系统协配性研究[J].船舶工程,2010, 32:151-154MENG Qingzheng, ZHOU Shaowei, LIU Junhua, et al.Study on the Coordination of Marine Artesian Salt Water Circulation System[J]. Ship Engineering, 2010, 32:151-154
[6]孙长江,吴炜,张晓阳,等.海水循环泵自流特性仿真研究[J].中国舰船研究,2011,6(6):88-91SUN Changjiang, WU Wei, ZHANG Xiaoyang, et al. Simulation Study on Automatic Flow Characteristics of Seawater Circulating Pump[J]. Chinese Journal of Ship Research, 2011, 6(6):88-91