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| Influence of blade thickness profile on energy distribution at impeller outlet of mixed-flow nuclear reactor coolant pump |
| YANG Minguan, LI Yuting*, GAO Bo, NI Dan, ZHANG Yongchao |
| School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to clarify mechanism of blades acting on a liquid, the hydraulic performance, energy distribution properties at impeller outlet and internal flow in mixed-flow impellers with different blade thickness profiles were investigated by using numerical methods. The kinetic and static pressure energies as well as the total energy at impeller outlet were obtained. In addition, the total energy was decomposed into radial and axial components, and their proportions to total energy were calculated. The fluid patterns around blades with different thickness profiles were analyzed.The results show that the streamline-wise variable blade thickness profile can result a better hydraulic performance than the span-wise variable thickness profile, especially in the case where the maximum thickness occurs near the hub. The total energy is almost the static pressure energy at impeller outlet, but it has a similar distribution feature to kinetic energy. The radial and axial energy proportion shave a relationship with both blade thickness profile and pump working condition. For the streamline-wise variable blade thickness profile, the blade can adapt the flow in both the axial and radial directions. For the span-wise variable blade thickness profile, however, the blade can adapt flow in one direction only.
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Received: 23 August 2016
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