排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2012, Vol. 30 Issue (3): 260-264    DOI: 10.3969/j.issn.1674-8530.2012.03.003
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Influence of gap on pressure pulsation and radial force of centrifugal pumps
   Shi-Wei-Dong1, ZHANG  Lei1, CHEN  Bin2, JIANG  Ting1, ZHANG  Hua1

(1.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China;
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Abstract Abstract: The unsteady flow in centrifugal pumps induces a pulsation in fluid pressure inside the volute channel and imposes a radial force on the volute wall too. Thus effect of the gap between the volute tongue and impeller outlet on them was tackled by means of a nonoverload submersible sewage pump with extremely thickenedblades. Three pump models with different base circle diameters, such as 390, 435 and 460 mm were designed. The unsteady flow fields in those models were obtained numerically based on the standard k-ε turbulence model and SIMPLE algorithm. The characteristics of pressure pulsation on the tongue and the radial force on the wall against gap were obtained. The results showed that the pressure pulsation and the radial force presented an obvious periodicity due to the rotorstator interaction. The dominant frequency of pressure pulsation at the monitor points in the volute was the blade passing frequency. At the same flow rate, the intensity and amplitude of pressure pulsation at the dominant frequency were increased with decreasing gap.The timeaveraged radial force imposed on the wall was decreased and then increased with increasing flow rate.Compared with the original pump model, the averaged radial force in the new models was increased regardless of gap at the same flow rate.
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Articles by authors
Shi-Wei-Dong
ZHANG Lei
CHEN Bin
JIANG Ting
ZHANG Hua
Key wordscentrifugal pump   gap   extremely thickened blade   rotor stator interaction   radial force   pressure pulsation     
Received: 2011-05-14; Published: 2012-04-10
Cite this article:   
Shi-Wei-Dong,ZHANG Lei,CHEN Bin et al. Influence of gap on pressure pulsation and radial force of centrifugal pumps[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(3): 260-264.
 
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