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| Transient numerical simulation and visualization of self-priming process in self-priming centrifugal pump |
| LU Tianqiao, LI Hong, ZHAN Lianchen |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Based on the Euler multiphase model, standard k-ε turbulence model and sliding mesh technique, the self-priming process in a 65ZB-40C self-priming centrifugal pump are simulated. The experimental rotational speed curve of impeller and pressure curve at the pump outlet are taken as the boundary conditions in the simulation. The monitoring planes/surfaces are set in the volute, impeller, air-liquid separation chamber and reflux hole to analyze the changes of air volume fraction, air and liquid velocity and pressure. The numerical results are compared with the observation made by using high-speed camera. The results show that the air-liquid two-phase flow patterns are consistent with the observed pressure, flow rate and rotational speed in experiment. The stable self-priming process occupies the maximum portion of the self-priming time and has the most significant effect on the self-priming performance. In the end of the self-priming process, the flow rate and pressure change abruptly. The water droplets in the air-liquid separation chamber and the bubbles at the outlet of volute nozzle increase and decrease rapidly, showing an apparent transient effect. The gas phase cavity in the center of air-liquid separation chamber is beneficial to the formation of moving bubbles in the volute outlet area and the steady gas discharging from the self-priming pump.
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Received: 14 December 2015
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