Centrifugal pump fluid-structure interaction characteristics under different cavitation conditions

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (23) : 203-208.

MOU Jiegang ，CHEN Ying，GU Yunqing，ZHENG Shuihua， QIAN Heng

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Abstract

For fluid-structure interaction problems of centrifugal pump cavitation, centrifugal pump cavitation was simulated numerically based on the full cavitation and gas-liquid two-phase model, and the deformation of the rotor system was simulated under different cavitation conditions using one-way coupling. Cavitation bubbles on the impeller, static pressure, relative liquid velocity distribution of centrifugal pump and pressure pulsation in volute, impeller radial force characteristics were analyzed, the effect on the internal flow field and rotor system deformations were studied. The results show that the vapor volume fraction and area on blade suction surface are larger than blade pressure surface, impeller static pressure distribution is more uneven with cavitation development. The bubbles on the impeller will plug flow channel under serious cavitation, results in flow separation phenomenon, then vortex is generated. Cavitation lead to the increase of pressure fluctuation in volute and irregular distribution of radial force. Cavitation has an effect on the deformation of centrifugal pump rotor system, impeller appears non-axisymmetric deformation caused by vortex under cavitation condition.

Key words

centrifugal pump / cavitation / fluid-solid interaction / numerical simulation / rotor deformation

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MOU Jiegang,CHEN Ying，GU Yunqing，ZHENG Shuihua， QIAN Heng. Centrifugal pump fluid-structure interaction characteristics under different cavitation conditions[J]. Journal of Vibration and Shock, 2016, 35(23): 203-208

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