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| Numerical simulation of transient flow in self-priming centrifugal pump during self-priming period |
| Li Hong, Xu Dehuai, Li Lei, Tu Qin, Zou Chenhai |
| Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract The transient air-water two-phase flow field in 65ZB-40 self-priming centrifugal pump du-ring self-priming period was simulated numerically by using the standard k-ε turbulence model, VOF multi-phase model, sliding mesh technique and the velocity profile measured at the inlet of the pump to disclose self-priming mechanism. The transient pressure, velocity and void fraction of the two-phase flow in the pump were acquired at 10 monitoring points in the volute and in 8 zones inside the impeller. The results revealed that the pressure and void fraction experience a rapidly transient process in most area of flow field inside the pump at the early and late stages of self-priming period. At the early stage of self-priming period, the velocity at the impeller entrance, in the cross-sections of volute, reflux hole and inlet to the air separation chamber oscillates, showing a dominated transient effect.
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Received: 28 October 2012
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