Numerical study of the influence of half diffuser on the radial force in a centrifugal pump

PDF(3889 KB)

Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (10) : 15-22.

Jiang Wei1, Chen Diyi1,Wang YuChuan1, Zhu Xiangyuan2,Li Guojun2

Author information +

History +

Abstract

Half guide vanes have been widely used in compressor and turbine machinery to improve the aerodynamic performance, but are seldom used in centrifugal pumps and the influence mechanism of the performance of pump is not yet very clear.The SST k-ω turbulence model was adopted to analyze the unsteady state of internal flow field of a half guide vane centrifugal pump.The influence of half guide vanes on the pressure fluctuation and radial force performance of centrifugal pump was discussed by numerical simulations and experiments.The results show that when the H/b=0.4 ~ 0.6, the centrifugal pump has the best hydraulic performance and wider efficiency range.With the increase of the flow rate, the pressure symmetry of the flow path in the impeller of the ordinary guide vane centrifugal pump gradually becomes better, and the radial force acting on the impeller gradually decreases, while the pressure symmetry of the flow path in the impeller of the half guide vane centrifugal pump is gradually deteriorated and the radial force is gradually increased.In each flow conditions, the instantaneous average radial force of the half guide vane centrifugal pump is greater than that of the ordinary guide vane centrifugal pump, but the difference between its radial force crest and trough is small, that is, the half guide vanes can effectively reduce the alternating stress in the impeller.The radial force distribution on the impeller of the half guide vans centrifugal pump is more uniform, and in each flow condition, the fluctuation of the impeller outlet flow angle is somewhat less.The results provide a theoretical basis and reference to the design of centrifugal pumps with half guide vanes.

Key words

Half guide vane / Pressure fluctuation / radial force / Centrifugal pump / Numerical study

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

Jiang Wei1, Chen Diyi1,Wang YuChuan1, Zhu Xiangyuan2,Li Guojun2. Numerical study of the influence of half diffuser on the radial force in a centrifugal pump[J]. Journal of Vibration and Shock, 2019, 38(10): 15-22

References

[1] X F Gao, W D Shi, D S Zhang, et al. Calculation and Analysis of Submersible Well Pump Clearance Leakage Loss [J]. Applied Mechanics & Materials, 2013, 456:225-229.
[2] Li W, Shi W D, Xu Y D, et al. Effects of guide vane thickness on pressure pulsation of mixed-flow pump in pumped-storage power station[J]. Journal of Vibroengineering, 2013, 15(3):1177-1185.
[3] Liu H L, Ding J, Dai H W, et al. Investigation into Transient Flow in a Centrifugal Pump with Wear Ring Clearance Variation[J]. Advances in Mechanical Engineering, 2015, 6(2):693097-693097.
[4] Pavesi G, Cavazzini G, Ardizzon G. Time-Frequency Characterization of Rotating Instabilities in a Centrifugal Pump with a Vaned Diffuser[J]. International Journal of Rotating Machinery, 2008, 2008(3):10.
[5] Petit O, H kan Nilsson. Numerical Investigations of Unsteady Flow in a Centrifugal Pump with a Vaned Diffuser[J]. International Journal of Rotating Machinery,2013, 2013(1):32-40.
[6] Ji P, Yin T, Yuan S, et al. Cavitation Optimization for a Centrifugal Pump Impeller by Using Orthogonal Design of Experiment[J]. Chinese Journal of Mechanical Engineering, 2017, 30(1):103-109.
[7] Jiang X, Wang C, Wu J, et al. Effect of diffuser inlet width on cantilever multistage centrifugal pump[J]. Dyna, 2017,92(3): 63-70.
[8] Kreuz-Ihli T, Filsinger D, Schulz A, et al. Numerical and experimental study of unsteady flow field and vibration in radial inflow turbines[J]. Journal of Turbomachinery, 2000, 122 (2): V001T003A053.
[9] Muggli FA, Eisele K, Casey MV, et al. Flow analysis in a pump diffuser-Part 2: validation and limitations of CFD for diffuser flows[J]. Journal of Fluids Engineering, 1997, 119 (4): 978-984.
[10] Yang J, Pavesi G, Yuan S, et al. Experimental characterization of a pump-turbine in pump mode at hump instability region[J]. Journal of Fluids Engineering, 2015, 137 (5): 051109-051109-11.
[11] Kaupert KA, Staubli T. Transient hysteresis in a centrifugal pump characteristic and the associated unsteady flow field[J]. American Society of Mechanical Engineers Fluids Engineering Division Fed, 1997,120(10):10-18.
[12] Kaupert KA, Staubli T. The usteady pressure field in a high specific speed centrifugal pump impeller-part II: transient hysteresis in the characteristic [J]. J Fluids Eng., 2007, 121 (3):627-632.
[13] Guelich JF, Egger R. Part load flow and hydraulic stability of centrifugal pumps[J]. Epri, 1992,12(1):1-8.
[14] Hoshino M, Ohki H, Yoshinaga Y. The effect of guide vane height on the diffuser flow in centrifugal compressors[J]. Transactions of the Japan Society of Mechanical Engineers B, 1985, 51: 3366-3369.
[15] Yoshinaga Y, Kaneki T, Kobayashi H, et al. A study of performance improvement for high specific speed centrifugal compressors by using diffusers with half guide vanes[J]. Journal of Fluids Engineering, 1987, 109 (4): 359-367.
[16] Sitaram N, Issac JM, Sitaram N, et al. An experimental investigation of a centrifugal compressor with hub vane diffusers[J]. Proceedings of the Institution of Mechanical Engineers Part A Journal of Power & Energy, 1997, 211 (5): 411-427.
[17] 刘立军. 离心压气机级内定常或非定常粘性流动的数值分析与实验研究[D].西安: 西安交通大学, 1999.
Liu lijun. Numerical analysis and experimental study of constant or unsteady viscous flow in centrifugal compressor[D]. Xi'an Jiaotong University,1999.
[18] Liu R, Xu Z. Numerical investigation of a high-speed centrifugal compressor with hub vane diffusers[J]. Proceedings of the Institution of Mechanical Engineers Part A Journal of Power & Energy, 2004, 218 (3): 155-169.
[19] Issac JM, Sitaram N, Govardhan M, et al. Effect of diffuser vane height and position on the performance of a centrifugal compressor[J]. Proceedings of the Institution of Mechanical Engineers Part A Journal of Power & Energy, 2004, 218 (8): 647-654.
[20] Zhang W, Gong W, Fan X, et al. The Effect of half vane diffuser on the noise generated from a centrifugal Fan[J]. Experimental Techniques, 2012, 36 (3): 5-13.
[21] 刘宝军, 贺利生, 雷明洋等. 低稠度半高叶片扩压器的模型级性能研究[J]. 风机技术, 2011,34(2): 10-14.
Liu Baojun,He Lisheng, Lei Ming, et al. Performance Research on Model Stage of Half Low Solidity Vaned Diffuser [J]. Compressor Blower & Fan Technology, 2011,34(2):10-14.(in Chinese)
[22] Tan M G, He X H, Liu H L, et al. Design and analysis of a radial diffuser in a single-stage centrifugal pump[J]. Engineering Applications of Computational Fluid Mechanics, 2016, 10(1):502-513.
[23] Alemi H, Nourbakhsh S A, Raisee M, et al. Development of new “multi-volute casing” geometries for radial force reduction in centrifugal pumps[J]. Engineering Applications of Computational Fluid Mechanics, 2015, 9(1):1-11.