|
|
|
| Influence of long and short guide vanes on hydraulic performance of water-jet pump |
| LI Qiang, XIA Shengsheng*, YAN Hao |
| School of Mechanical Engineering, Hefei University of Technology, Hefei, Anhui 230009, China |
|
|
|
|
Abstract Different guide vane structures will affect the flow inside the pump, and then affect the transformation of the pressure energy and kinetic energy, and change the velocity distribution of the pump outlet. In order to study the influence of long and short guide vanes on the water-jet pump, on the basis of conventional design, we designed eight schemes of guide vane with different vertical heights in the method of computational fluid dynamics for numerical calculation, obtained the perfor-mance curve of water-jet pumps which had different long and short guide vanes, and finally analyzed the influence of different guide vanes on hydraulic performance and internal flow.The results show that all of schemes reducing the height of blade can improve the head and efficiency. In the schemes redu-cing the height on the shroud, the guide vanes that the height of the blade is equal to the height diffe-rence between hub and shroud in impeller have the highest head and efficiency. In all schemes decreasing the blade height, with the increase of the height difference, the velocity increases gradually and the distribution of turbulence kinetic energy becomes more reasonable in the guide vane outlet. The schemes reducing the height on the hub have more reasonable distribution of velocity and turbulence kinetic energy according to schemes reducing the height on the shroud.The guide vanes of long and short blades can be used to stagger the position of the diffusion flow generated by adjacent blades, which can reduce the effect of the velocity circulation and make the flow of the outlet position more stable.
|
|
Received: 10 January 2018
|
|
|
|
| [1]HU J, HU S, WANG P S. Research on hydrodynamic characteristics of axial water-jet pump with guide vane[J]. Journal of hydroelectric engineering, 2008, 27(1): 32-37.[2]QIAN Z D, WANG F, WANG Z Y, et al. Experimental study on hydraulic performance of saddle zone in axial flow pump with adjustable guide vane[J]. Journal of drainage and irrigation machinery engineering, 2013, 31(6):123-127, 137.[3]WANG J, MA P F,JUN Wang, et al. Effects of guide vane outlet-stagger-angle on bi-directional axial pump performance[J]. Fluid machinery,2014,42(8):31-35.[4]XU J, GU C G. Numerical calculation of flow field in centrifugal impeller with splitter blades[J]. Journal of che-mical industry and engineering, 2004, 55(4):541-544.[5]GOLCU M, PANCAR Y, SEKMEN Y. Energy saving in a deep well pump with splitter blade[J]. Energy conversion and management, 2006, 47(5):638-651.[6]GOLCU M, USTA N, PANCAR Y. Effects of splitter blades on deep well pump performance[J]. Journal of energy resources technology,2007,129(3):169-176.[7]CHEN S S, ZHOU Z F, Z Q, et al. PIV measurement of internal flow in centrifugal pump impeller with splitters[J]. Transactions of the CSAM, 2007, 38(2):98-101.[8]CHEN S S, LIAN S J, ZHOU Z F, et al. Study on the characteristics of three centrifugal pump impellers with deviated splitters by three-dimensional turbulent numerical simulation[J]. Journal of Yangzhou University(natural science edition), 2007, 38(2):98-101.[9]CHEN S S, ZHOU Z F, GE Q, et al.Orthogonal experimental study on centrifugal pump with deviated splitter vanes[J]. Journal of Yangzhou University(natural science edition), 2005, 8(4):45-48.[10]HE Z N, CHEN S S, PAN G X, et al. Three-dimensional turbulent simulation and PIV measurement of flow in centrifugal pump impellers with short splitters[J]. Journal of Yangzhou University(natural science edition), 2013, 16(2):40-44.[11]LIAN S J, CHEN S S, ZHOU Z F, et al.Study on three-dimensional numerical simulation of turbulent flow in the centrifugal pump with long and short blades[J].Fluid machinery,2011,39(3):18-22.[12]GUO X M, ZHU Z C, GUI B L, et al.Inducer-short blade position influence on cavitation performance of high speed centrifugal pump[J].Journal of engineering thermo-physics,2012,33(10):1695-1698.[13]SHIGEMITSU T, FUKUTOMI J, WADA T, et al. Performance analysis of mini centrifugal pump with splitter blades[J]. Journal of thermal science, 2013, 22(6):573-579.[14]SHIGEMITSU T, FUKUTOMI J, KAJI K, et al. Unsteady internal flow conditions of mini-centrifugal pump with splitter blades[J]. Journal of thermal science, 2013, 22(1):86-91.[15]CAVAZZINI G, PAVESI G, SANTOLIN A, et al. Using splitter blades to improve suction performance of centri-fugal impeller pumps[J]. Journal of power and energy, 2015, 229(3):309-323.[16]LI Y J, YAN D F, YUAN SQ. Performance prediction for large low-head pump and pumping installation[J]. Transactions of the CSAM, 2007, 38(10):36-40.[17]LI J, CAO Y M, GAO C C. Research on performance prediction on low-head axial pump and pump station[J].China rural water and hydro-power,2015(3):121-123, 126. |
|
|
|
