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Numerical investigation of the benefits of serrated Gurney flaps on an axial flow fan

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  • Ye, Xuemin
  • Zheng, Nan
  • Hu, Jiami
  • Li, Chunxi
  • Xue, Zhanpu

Abstract

A novel serrated Gurney flap (SGF) is proposed, and a large eddy simulation is employed to simulate a two-stage variable-pitch axial fan with SGFs. The influence of the novel blades on the aerodynamic performance, sound characteristics and internal dynamics of the fan was examined, and the possible mechanism for noise reduction and vortex structure were investigated. Results indicate that the peak efficiency of the fan shifts toward the large flowrate side, and the high-efficiency region is widened when using SGFs. SGFs with an appropriate serration height reduce high-frequency noise, and the noise reduction gradually improves with decreasing serration height. The use of SGFs decreases the turbulence pulsation intensity, improves the size and distribution of wake vortices, and abates the leading-edge separation vortex and turbulence intensity. Mechanism studies indicate that two counter-rotating vortex pairs in the vertical and horizontal directions interact strongly, which alleviates the aerodynamic acoustics of the fan. A fan with an SGF with a serration height of 0.8% chord achieves the optimal overall performance, including improved efficiency, total pressure rise, and reduced noise.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:252:y:2022:i:c:s0360544222009756
    DOI: 10.1016/j.energy.2022.124072
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    References listed on IDEAS

    as
    1. Zhou, Teng & Cao, Huijing & Zhang, Mingming & Liao, Caicai, 2022. "Performance simulation of wind turbine with optimal designed trailing-edge serrations," Energy, Elsevier, vol. 243(C).
    2. Li, Chunxi & Lin, Qing & Ding, Xueliang & Ye, Xuemin, 2016. "Performance, aeroacoustics and feature extraction of an axial flow fan with abnormal blade angle," Energy, Elsevier, vol. 103(C), pages 322-339.
    3. Ye, Xuemin & Ding, Xueliang & Zhang, Jiankun & Li, Chunxi, 2017. "Numerical simulation of pressure pulsation and transient flow field in an axial flow fan," Energy, Elsevier, vol. 129(C), pages 185-200.
    4. Ye, Xuemin & Li, Pengmin & Li, Chunxi & Ding, Xueliang, 2015. "Numerical investigation of blade tip grooving effect on performance and dynamics of an axial flow fan," Energy, Elsevier, vol. 82(C), pages 556-569.
    5. 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.
    6. Liu, Xue & Liu, Jian & Wang, Dong & Zhao, Long, 2021. "Experimental and numerical simulation investigations of an axial flow fan performance in high-altitude environments," Energy, Elsevier, vol. 234(C).
    7. 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.
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    Cited by:

    1. Ye, Xuemin & Hu, Jiami & Zheng, Nan & Li, Chunxi, 2023. "Numerical study on aerodynamic performance and noise of wind turbine airfoils with serrated gurney flap," Energy, Elsevier, vol. 262(PB).
    2. Xu, Wei & Chen, Genglin & Shi, Huijin & Zhang, Pengcheng & Chen, Xuemei, 2023. "Research on operational characteristics of coal power centrifugal fans at off-design working conditions based on flap-angle adjustment," Energy, Elsevier, vol. 284(C).
    3. 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).

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