Abstract:With commercial software FLUENT,two equations standard k-ε turbulence model and SIMPLEC algorithm were adopted to simulate the internal flow-field of a centrifugal pump with single and double volutes.The distribution laws of static pressure field and velocity field were analyzed,and the radial forces were calculated by empirical formula.The comparing analysis indicates that centrifugal pump with single volute may have large pressure difference,which acts on impeller to produce radial forces,in both sides of tongue tip at off-design conditions.Some high speed unsymmetrical flows appear on impeller exit at low flow rates.While centrifugal pump with double volute can effectively improve the energy conversion in volute at off-design conditions,and the flows at low flow rates are more symmetrical,which can reduce the pressure difference and to balance the radical forces.The calculating result indicates that,the design can reduce the radial forces effectively at off-design conditions,the results of numerical simulation can basicly match with existing theory,and also offer some basis for better understanding the double volute pump.
刘建瑞, 徐永刚, 苏起钦, 王董梅. 基于FLUENT的单-双涡室离心泵径向力分析[J]. 排灌机械工程学报, 2009, 27(2): 83-86.
Liu Jianrui,Xu Yonggang,Su Qiqin,Wang Dongmei. Analysis of radial forces in centrifugal pump with single and double volute based on FLUENT. Journal of Drainage and Irrigation Machinery Engin, 2009, 27(2): 83-86.
[1]关醒凡.现代泵技术手册[M].北京:宇航出版社,1995:527-530.[2]特罗斯科兰斯基 A T,拉扎尔基维茨 S.叶片泵计算与结构[M].耿惠彬译.北京:机械工业出版社,1981:224-230.[3]Gonzalez J,Parrodo J,Santolaria C,et al.Steady and unsteady radial forces for a centrifugal pump with impeller to tongue gap variation[J].Journal of Fluids Engineering,2006,128(3):454-462.[4]潘地林,Whitfield A.蜗壳内部流动特性数值分析及改进设计研究[J].流体机械,1999,27(1):14-18.Pan Dilin,Whitfield A.Numerical simulation and design improvement in volute[J].Fluid Machinery,1999,27(1):14-18.(in Chinese)[5]王晓燕,刘宜,陈玉芳.HD型石油化工流程泵双蜗壳内部流场数值计算[J].排灌机械,2007,25(1):21-24.Wang Xiaoyan,Liu Yi,Chen Yufang.Numerical simulation of flow field in the double volute of HD type petrol chemical process pump[J].Drainage and Irrigation Machinery,2007,25(1):21-24.(in Chinese)[6]任涛,闫永强,梁武科.CFD技术在离心泵优化设计中的应用[J].排灌机械,2007,25(1):25-28.Ren Tao,Yan Yongqiang,Liang Wuke.Application of CFD to optimization design for centrifugal pump[J].Drainage and Irrigation Machinery,2007,25(1):25-28.(in Chinese)[7]Cui Baoling,Zhu Zuchao,Zhang Jianci,et al.The flow simulation and experimental study of low-specific-speed high-speed complex centrifugal impellers[J].Chinese Journal of Chemical Engineering,2006,14(4):435-441.[8]王洋,张翔,黎义斌.离心泵变工况流场分析及径向力数值预测[J].排灌机械,2008,26(5):18-22.Wang Yang,Zhang Xiang,Li Yibin.Off-design flow field analysis and radial force prediction of centrifugal pump[J].Drainage and Irrigation Machinery,2008,26(5):18-22.(in Chinese)[9]夏朋辉,刘树红,吴玉林.旋流泵全流道三维定常流场的数值模拟[J].工程热物理学报,2006,27(3):420-422.Xia Penghui,Liu Shuhong,Wu Yulin.Numerical simulation of steady flow in vortex pump[J].Journal of Engineering Thermophysics,2006,27(3):420-422.(in Chinese)