Tests for inlet vortex-induced pressure fluctuation of an axial flow pump

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (17) : 25-31.

SONG Xijie,LIU Chao，YANG Fan,ZHA Zhili, CHU Changhong, ZHANG Chongyang

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Abstract

From the perspective of inlet vortex affecting pressure pulsation in an axial flow pump,the influence mechanism of inlet vortex on the axial flow pump was investigated using pressure fluctuation feature tests. Pressure pulsation sensors were installed at impeller inlet,impeller outlet and guide vane outlet. Pressure fluctuation tests were conducted under three typical operation conditions and the development process of inlet vortex was clearly captured using a high speed camera. The results showed that the amplitude of pressure pulsation under a small flow rate condition is the largest at one measured point of the axial flow pump device; the amplitude of pressure pulsation decreases gradually with increase in flow rate; the pressure pulsation excitation source in impeller inlet area is impeller rotating; pressure pulsation in impeller outlet area is caused due to the interaction between guide vane and impeller; pressure pulsation in guide vane outlet area is mainly influenced by outlet circulation; under a large flow rate condition,inlet vortex is developed to enter impeller area,increase the instability of flow field inside impeller and affect pressure pulsation inside impeller; the inlet vortex frequency is the blade passing one to be easy to cause the whole unit’s resonance.

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axial-flow pump / model test / inlet vortex / pressure pulsation

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SONG Xijie,LIU Chao，YANG Fan,ZHA Zhili, CHU Changhong, ZHANG Chongyang. Tests for inlet vortex-induced pressure fluctuation of an axial flow pump[J]. Journal of Vibration and Shock, 2018, 37(17): 25-31

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