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PIV measurements of inner flow field in an inward radial diffuser under multi-conditions |
Huang Ping1, Zhang Li2, Zhou Ling1, Fu Yanxia1, Lu Weigang1 |
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Grundfos Holding A/S, Wuxi, Jiangsu 214112, China |
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Abstract In order to understand the flow pattern of the diffuser internal flow field and improve the diffuser hydraulic design method, a special test rig was designed and installed to investigate the flow fields in an inward radial diffuser by using the particle image velocimetry(PIV)technique. The test model is one stage of a deep-well multistage centrifugal pump, two water lubricated plain bearings were used to support the pump shaft, and a mirror placed in 45° was used to reflect the flow field of diffu-ser. The velocity flow fields under a variety of operational points were obtained by using the phase averaged method. The results show that the flow in the diffuser is uniform and stable at the design flow rate. At the larger flow rates, the flow is blocked by the finite throat area and a considerable shock loss is generated at the diffuser inlet. At the lower flow rates, flow separation and vortices appear, and the vortex intensity is strengthened with reducing flow rate. Meanwhile, the position of vortex core is mo-ving from the location nearby diffuser suction side to the middle of diffuser. Large hydraulic losses produce at the diffuser inlet, and the diffuser inlet setting angle have a significant effect on the pump performance. The flow area in the middle of diffuser passage needs to be further adjusted to improve the flow pattern under lower flow conditions.
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Received: 04 November 2013
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[1]Golcu M, Pancar Y, Skmen Y. Energy saving in a deep well pump with splitter blade [J]. Energy Conversion Management,2006, 47(5): 638-651.[2]Tushar G, Daniel J D, Raphael T H, et al. Improving the hydrodynamic performance of diffuser vanes via shape optimization [J]. Computers and Fluids, 2008,37(6): 705-723.[3]Anokhin V D,Lepekha A I.New-type deep-well pump[J].Chemical and Petroleum Engineering, 1998,24(3/4):178-180.[4]孔繁余,宿向辉,陈浩,等. 离心泵径向导叶正叶片参数的优化设计[J].农业工程学报,2012,28(23):40-45. Kong Fanyu,Su Xianghui,Chen Hao, et al. Optimal design on parameters of guide vane of radial diffusers in centrifugal pump[J]. Transactions of the Chinese Society of Agricultural Engineering,2012,28(23):40-45.(in Chinese)[5]汪家琼,孔繁余. 多级离心泵叶轮与导叶水力性能优化研究[J].华中科技大学学报:自然科学版,2013,41(3):92-96. Wang Jiaqiong, Kong Fanyu. Hydraulic performance optizimation study on impeller and diffuser of multi-stage centrifugal pump[J]. J Huanzhong Univ of Sci & Tech:Natural Science Edition, 2013,41(3):92-96.(in Chinese)[6]Zhou L, Shi W D, Lu W G, et al. Numerical investigations and performance experiments of a deep-well centrifu-gal pump with different diffusers [J]. Journal of Fluids Engineering, 2012, 134(7): 0711021-0711028.[7]Shi W D, Lu W G, Wang H L, et al. Research on the theory and design methods of the new type submersible pump for deep well [C]//Proceedings of ASME 2009 Fluids Engineering Division Summer Meeting,2009: 91-97.[8]Akin O, Rockwell D. Flow structure in a radial flow pumping system using high-image-density particle image velocimetry[J]. Journal of Fluids Engineering, 1994, 116(3):538-544.[9]Eisele K, Zhang Z, Casey M V. Flow analysis in a pump diffuser—Part 1: LDA and PTV measurements of the unsteady flow[J]. Journal of Fluids Engineering, 1997, 119(4):968-977.[10]Sinha M, Katz J. Quantitative visualization of the flow in a centrifugal pump with diffuser vanes—I: On flow structures and turbulence[J]. Journal of Fluids Engineering, 2000, 122(1):97-107.[11]Sinha M, Katz J, Meneveau C. Quantitative visualization of the flow in a centrifugal pump with diffuser vanes—II: Addressing passage-averaged and large-eddy simulation modeling issues in turbomachinery flows[J]. Journal of Fluids Engineering, 2000, 122(1):108-116.[12]Wuibaut G, Bois G, Dupont P, et al. PIV measurements in the impeller and the vaneless diffuser of a radial flow pump in design and off-design operating conditions[J]. Journal of Fluids Engineering, 2002, 124(3):791-797.[13]吴贤芳,刘厚林,王凯,等. 全工况下双流道泵内流三维PIV测量[J]. 排灌机械工程学报, 2012, 30(6): 665-669. Wu Xianfang, Liu Houlin, Wang Kai,et al. 3D PIV measurement of flow in double-channel pump under overall operating conditions[J].Journal of Drainage and Irrigation Machinery Engineering, 2012,30(6):665-669.(in Chinese) |
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