Effect of cavitation on pressure pulsation characteristics of an axial-flow pump under sand conditions

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (18) : 140-147.

LIN Peng1,2,3,XIANG Linqin1,HU Dong1,ZHAI Songmao2,GUO Pengcheng3,WANG Shu1

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Abstract

In order to clarify the influences of sediment concentration, particle size, cavitation and other factors on the internal pressure pulsation characteristics of an axial-flow pump, the SST k-ω turbulence model was adopted to do a simulation on the internal pressure pulsation characteristics under the conditions of clear water, sandy water, cavitation and cavitation under sand.The results show that the addition of sediment will increase the pressure pulsation and promote the development of cavitation.The pulsation coefficient at the impeller outlet is greater than that at the inlet.In addition to cavitation, the dynamic and static interference between the impeller and the guide vane is a major factor in causing pressure pulsation, and cavitation will further increase the pressure pulsation and adversely affect the vibration of the pump.The main frequency components of the vibration signal induced by pressure pulsation include those of 2.5 Hz, 10 Hz and 20 Hz, which are consistent with the pump frequency of 2.5 Hz, the leaf frequency of 10 Hz and its second harmonic frequency of 20 Hz.

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axial-flow pump / cavitation under sand condition / pressure pulsation / numerical simulation / cavitation characteristics

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LIN Peng,XIANG Linqin,HU Dong,ZHAI Songmao,GUO Pengcheng,WANG Shu. Effect of cavitation on pressure pulsation characteristics of an axial-flow pump under sand conditions[J]. Journal of Vibration and Shock, 2021, 40(18): 140-147

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