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| Internal flow numerical simulation of centrifugal pump under gas-liquid two-phase flow |
| Liu Ruihua1, Li Guidong2, Wang Yang2 |
| 1.Jiangsu Electric Power Construction No.3 Engineering Company, China Engineering Group Co. Ltd., Zhenjiang, Jiangsu 212013, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract A centrifugal pump at a specific speed of 129 was chosen to study the internal flow and pressure changes in the running process of centrifugal pumps under gas-liquid two-phase conditions. The unsteady numerical simulation for the full flow field of the pump was processed by the Eulerian-Eulerian inhomogeneous flow model based on CFX simulation software. The pressure pulsation and the volume distribution of the gas phase on the selected monitoring points and surfaces in the volute flow channel under different gas-phase volume fraction conditions were obtained. Comparing the numerical simulation with experimental performance curves, the results show that the gas phase volume is distributed mainly in the ipsilateral direction of impeller front cover in the flow channel of the volute. The monitoring points have the pressure pulsation frequency equivalent to the passing frequency of the blade under different gas contents. With the gas phase volume fraction increasing, the law that the pressure amplitude of monitoring points cyclically changes with time begins to be destroyed, the pressure pulsation frequency domain has a certain disorder and a series of fluctuations appear at low frequency. The fluid pressure of impeller is unevenly distributed due to the inhomogeneous distribution of the gas phase, thus making radial force which the impeller suffered decreased and its periodicity damaged.
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Received: 11 March 2015
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