Energy conversion mechanism of screw centrifugal pump under single-phase
Quan Hui1, Li Rennian1, Su Qingmiao2, Han Wei1, Cheng Xiaorui1, Shen Zhengjing1
1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Lanpec Technologies Ltd., Lanzhou, Gansu 730070, China
Abstract:In order to research screw centrifugal pump impeller power capability and energy conversion mechanism, the internal flow in fluid machinery is analyzed theoretically. Based on Eulerian equation adopted, the fluid energy in the impeller was divided into the dynamic pressure and static pressure head, which provides a theoretical foundation for the application of numerical simulation on analyzing the internal flow and the acting ability of various impeller fragments. Navier-Stokes equation and standard k-ε equation turbulence model are used to simulate the screw centrifugal pump internal flow. Taking water as medium, the flow filed including pressure and velocity was simulated under design condition. The monitoring points were taken at screw centrifugal impeller tip and hub, and dynamic head and static head change at the segments between the monitoring points were obtained to analyze the energy conversion capability along the impeller. The results show that the energy of fluid of the screw centrifugal pump is provided by helical segments, and the front helical segments of the impeller played a multi-level role. The impeller makes fluid from axial to radial completion of the transition, in which fluid velocity of axial changes from large to small while radial velocity is vise versa.
权辉, 李仁年, 苏清苗, 韩伟, 程效锐, 申正精. 单介质螺旋离心泵能量转换机理[J]. 排灌机械工程学报, 2014, 32(2): 130-135.
Quan Hui, Li Rennian, Su Qingmiao, Han Wei, Cheng Xiaorui, Shen Zhengjing. Energy conversion mechanism of screw centrifugal pump under single-phase. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(2): 130-135.
[1]Jackson D. High efficiency immersible pumps for solids handling applications[J]. World Pumps, 1982,190:335-341.[2]李仁年,权辉,韩伟,等.变螺距对螺旋离心泵轴向力的影响[J].机械工程学报,2011,47(14):158-163. Li Rennian, Quan Hui, Han Wei, et al. Influences of variable-pitch blade on the screw centrifugal pump[J]. Journal of Machinery Engineering, 2011,47(14):158-163.(in Chinese)[3]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011.[4]Roussopoulos Kimon, Monkewitz Peter A. Measurements of tip vortex characteristics and the effect of an anti-cavitation lip on a model Kaplan turbine blade[J]. Flow, Turbulence and Combustion,2000,64(2):119-144.[5]陆肇达,王立文. 泵与风机系统的能量学和经济性分析[M].北京:国防工业出版社,2009.[6]袁寿其,周建佳,袁建平,等.带小叶片螺旋离心泵压力脉动特性分析[J].农业机械工程,2012,43(3):83-92. Yuan Shouqi, Zhou Jianjia, Yuan Jianping,et al.Cha-racteristic analysis of pressure fluctuation of unsteady flow in screw-type centrifugal pump with small blade[J]. Transaction of the Chinese Society for Agricultural Machinery, 2012,43(3):83-92.(in Chinese)[7]Miya M, Maeda H, Umeki I, et al. Unstablehead-flow characteristic generation mechanism of a low specific speed mixed flow pump[J]. Journal of Thermal Science, 2006,15(2):115-120.[8]王福军.计算流体动力学分析——CFD软件原理与应用[M].北京:清华大学出版社,2005.[9]江帆. Fluent高级应用与实例分析[M].北京:清华大学出版社,2008.[10]权辉.螺旋离心泵内部流动和能量转换机理的研究[D].兰州:兰州理工大学能源与动力工程学院,2012.