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| Numerical simulation on performance of self-regulating jet pump |
| LONG Xin-ping, GUAN Yun-sheng, HAN Ning, CHENG Zhi-yi, L Jun-xian |
| School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China |
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Abstract The performance under different relative nozzle openings of a self-regulating jet pump,with nozzle outlet area controlled by a needle,was simulated by RNG k-ε turbulence model and SIMPLE algorithm.It is found that the needle exerts influence on the performance of the pump.With the decrease of the nozzle opening and increase of the needle itinerary,the needle has more impacts on the efficiency of the pump.Comparison between the calculated and experimental data shows that the two agree well with each other when the nozzle opening is large.While under smaller nozzle openings especially when the jet pump working in small flow rate ratios,there exist some deviations between the calculated and measured results,though they present the same tendency.Based on the analysis of above mentioned deviation,a correlation was proposed to predict the actual performance of the self-regulating jet pump based on nume-rical simulation.This formula can predict the actual performance and provide guidance for the design of self-regulating jet pumps.
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Received: 08 August 2013
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