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| DOI：10.13522/j.cnki.ggps.2017.11.013 |
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| Analyzing the Impact of the Diameter of Return-flowing Valve on Flow Field in Magnetically-driven Pump |
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GAO Zhenjun, LI Hao, LIU Jianrui, DUAN Fuyi, SU Huashan, CHANG Hao
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College of Mechanical and Power Engineering, Three Gorges University, Yichang 443000, China; .Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China; Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/Henan Key Laboratory of Water-saving Agriculture, Xinxiang 450002, China
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| Abstract: |
| The effects of the diameter of return-flowing valve onflow field and hydraulic characteristics in magnetic pump were numerically studied in this paper. We examined three diameters: 6mm, 8mm and 10mm.The internal flow, temperature and pressure distributionsin the pump were numerically simulated under both steady an unsteady conditions with consideration of heat-fluid coupling. The results showed that the change in return-flowing valve diameter had only a minor impact on lift height and efficiency of the pump as well as the flow field, although the lift height and efficiency decreased with the increase in the diameter. Under cooling condition, however, a change in the return-flowing valve diameter could significantly impact flow and temperature fields, as well as pressure fluctuation in the pump. With increase in the diameter, the kinetic energy distribution and cooling efficiency increased, while the pressure distribution decreased. In addition, the diameter of the return-flowing valve had little effect on pressure fluctuation intensity of cooling circulation fluid, but it had a great effect on the release velocity of pressure fluctuation in cooling circulation fluid. Overall, the changes of reflowing valve had a great effect on the flow characteristic of cooling circulation fluid, and have minimal effect on the flow characteristic of magnetic drive pump. |
| Key words: magnetic drive pump; reflowing valve; numerical simulation; internal flow characteristics; pressure fluctuation; coupled flow and temperature |
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