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| Effect of jet centrifugal pump with different throat length on the performance of self-priming |
| WU Wen, WANG Yang, HAN Yawen |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to study effect of jet centrifugal pump with different throat length on the perfor-mance of self-priming, the steady numerical simulation of gas-liquid two-phase flow in a jet centrifugal pump with different throat length was carried out with the Eulerian-Eulerian multiphase flow model of the CFX software. The internal pressure, gas velocity and gas phase volume fraction of the jet centrifugal pump were obtained by numerical simulation and the self-priming performance of the jet centrifugal pump was analyzed and verified by experiments. The results of simulation show that when throat length is 10 mm, the static pressure in throat cylinde decrease, the entrainment action is strengthened, and the gas phase velocity on the axis increases,the gas phase separation capacity will be enhanced, and the self-priming performance of the pump is improved. When throat length is 15 mm, it has a little effect on the static pressure and gas velocity of the jet centrifugal pump. The hydraulic performance of the pump becomes poor because of the increase of the flow loss. The experiments state that when throat length is 10 mm, self-priming performance has been significantly improved, and met design requirements, with self-priming height increasing from 7.45 m to 9.15 m and self-priming time decreasing from 148.5 s to 90.0 s.
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Received: 27 October 2016
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