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Effect of blade tip pattern on performance of a twin-stage variable-pitch axial fan

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  • Ye, Xuemin
  • Zhang, Jiankun
  • Li, Chunxi

Abstract

The effect of five blade tip patterns on performance and acoustics of a twin-stage variable-pitch axial fan is investigated numerically. The best tip pattern is determined by comparing the overall performance under the condition of those patterns carving in stage I impeller, and the performance promotion is then examined under the selected tip grooving in stage I impeller, stage II impeller and both two stage impellers. Finally, flow dynamics and acoustic noise are explored. The results show that all proposed tip patterns can improve fan performance effectively, and the best scenario is the direct groove tip implementing in stage I impeller. After blade tip grooving, the internal dynamics in the tip clearance tends to be more complex, the static pressure reduces notably in the suction side and the sound power level in the tip increases significantly, while the leakage losses decline distinctly. Blade tip pattern changes the profile and amplitude of the sound pressure in time domain; the base frequency and first five−order harmonics are clearly observed in two stage impellers, but only the second−order harmonics are emerged in the other regions. The noise is generated largely by low and medium frequency sound with an obvious broadband feature.

Suggested Citation

  • Ye, Xuemin & Zhang, Jiankun & Li, Chunxi, 2017. "Effect of blade tip pattern on performance of a twin-stage variable-pitch axial fan," Energy, Elsevier, vol. 126(C), pages 535-563.
    • Handle: RePEc:eee:energy:v:126:y:2017:i:c:p:535-563
    DOI: 10.1016/j.energy.2017.03.057
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    References listed on IDEAS

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    Cited by:

    1. Zhang, Lei & He, Ruiyang & Wang, Xin & Zhang, Qian & Wang, Songling, 2019. "Study on static and dynamic characteristics of an axial fan with abnormal blade under rotating stall conditions," Energy, Elsevier, vol. 170(C), pages 305-325.
    2. Wang, Youhao & Sun, Lihui & Guo, Chang & He, Suoying & Gao, Ming & Xu, Qinghua & Zhang, Qiang, 2023. "Vibration characteristics and strength analysis of two-stage variable-pitch axial-flow fan based on fluid-solid coupling method," Energy, Elsevier, vol. 284(C).
    3. Zhang, Jiankun & Liu, Haihu, 2023. "Multi-objective optimization of aerodynamic and erosion resistance performances of a high-pressure turbine," Energy, Elsevier, vol. 277(C).
    4. Xuemin Ye & Fuwei Fan & Ruixing Zhang & Chunxi Li, 2019. "Prediction of Performance of a Variable-Pitch Axial Fan with Forward-Skewed Blades," Energies, MDPI, vol. 12(12), pages 1-20, June.
    5. Liu, Yabin & Tan, Lei, 2020. "Influence of C groove on suppressing vortex and cavitation for a NACA0009 hydrofoil with tip clearance in tidal energy," Renewable Energy, Elsevier, vol. 148(C), pages 907-922.
    6. Ye, Xuemin & Zheng, Nan & Hu, Jiami & Li, Chunxi & Xue, Zhanpu, 2022. "Numerical investigation of the benefits of serrated Gurney flaps on an axial flow fan," Energy, Elsevier, vol. 252(C).
    7. Han, Yadong & Liu, Yabin & Tan, Lei, 2022. "Method of variable-depth groove on vortex and cavitation suppression for a NACA0009 hydrofoil with tip clearance in tidal energy," Renewable Energy, Elsevier, vol. 199(C), pages 546-559.
    8. Liu, Yabin & Tan, Lei, 2018. "Method of C groove on vortex suppression and energy performance improvement for a NACA0009 hydrofoil with tip clearance in tidal energy," Energy, Elsevier, vol. 155(C), pages 448-461.

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