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| Study on Internal Flow Field of Centrifugal Pump based on PIV Test and CFD-DEM Coupling |
| Received:May 12, 2020 |
| DOI：10.11981/j.issn.1000-6842.2021.01.34 |
| Key Words:pulp pump;CFD-DEM;PIV;internal flow field;fiber |
| Fund Project:国家自然科学基金资助项目（51309118）;江苏省“六大人才高峰”（2015-ZBZZ-016）;江苏大学高级人才启动基金资助项目（11JDG085）。 |
| Author Name | Affiliation | E-mail | | ZHANG Qihua* | Research Center of Fluid Machinery Engineering and Technology， Jiangsu University， Zhenjiang， Jiangsu Province， 212013 | qihua05@163.com | | ZHANG Weidong | Research Center of Fluid Machinery Engineering and Technology， Jiangsu University， Zhenjiang， Jiangsu Province， 212013 | | | YAN Zhaoxu | Research Center of Fluid Machinery Engineering and Technology， Jiangsu University， Zhenjiang， Jiangsu Province， 212013 | | | XIE Zhiang | Research Center of Fluid Machinery Engineering and Technology， Jiangsu University， Zhenjiang， Jiangsu Province， 212013 | | | KANG Shun | Research Center of Fluid Machinery Engineering and Technology， Jiangsu University， Zhenjiang， Jiangsu Province， 212013 | |
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| Abstract: |
| In order to study the impacts of fiber particles on the liquid flow field in the impeller passage of a centrifugal pump， the CFD-DEM coupling model was used to simulate the flow of fiber suspension in the pump. A model pump made of transparent organic glass was used to perform the experimental tests. Visual verification of the flow of fiber （hair） suspension in the impeller passage was conducted through the external characteristics experiment and PIV test. The flow field in the impeller passage was analyzed based on the PIV results， which indicated that the pump efficiency was improved by the increase of the fiber mass concentration in the pump. The drag reduction effect was clearly observed as the fiber mass concentration reached 0.2%. When fibers of the same mass concentration were transported under small flowrate， a low-speed zone near the pressure surface along the middle of impeller passage was generated. The low-speed zone would gradually spread to the middle passage with the decrease of flowrate. Distortion of blade curvature would affect the relative velocity distribution in different cross-sections along impeller passage perpendicular to the pump shaft. Specifically， the difference of relative velocity between different positions would increase as the distortion extent of blades continued to increase. The relative velocity distribution in the passage was affected by the mass concentration， the relative velocity of the liquid phase in high concentration fiber suspension gradually exceeded that of the low concentration fiber suspension as the flowrate increasing gradually. Meanwhile， the relative velocity from suction side to pressure side in the impeller passage of various concentration of suspension tended to decrease under large flowrate. |
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