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Numerical simulation of pressure pulsation and transient flow field in an axial flow fan

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

Abstract

An abnormal regulation of the stagger angle deteriorates the internal flow field and pressure pulsation, leading to an augmentation of aero-acoustic noise and vibrations in variable-pitch axial fans. To evaluate the effects of an abnormal stagger angle, the pressure pulsation and transient flow field under normal and abnormal regulations of the stagger angle were simulated using unsteady 3D modelling. The characterization capabilities of the approximate entropy and sample entropy for identifying an abnormal deviation were examined by extracting the features from the static pressure signals. The results indicate that, after an abnormal deviation of stagger angle, the periodic and quasi-periodic pulsation distributions of the static pressure are distinctly hindered, and the impacts of an abnormal deviation angle on the pressure distributions in the time and frequency domains are intensified with increasing deviation degree, resulting in increased pressure fluctuation intensity. The transient flow field clearly changes with time and degree of deviation, and abnormal high- and low-pressure regions are developed. Both the approximate entropy and sample entropy can be used to identify an abnormal blade deviation, but the sample entropy is more suitable for characterizing the effects of deviation degree on the static pressure at the impeller and guide vane outlets.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:129:y:2017:i:c:p:185-200
    DOI: 10.1016/j.energy.2017.04.076
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    References listed on IDEAS

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    1. 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.
    2. 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.
    3. Ghasemian, Masoud & Nejat, Amir, 2015. "Aero-acoustics prediction of a vertical axis wind turbine using Large Eddy Simulation and acoustic analogy," Energy, Elsevier, vol. 88(C), pages 711-717.
    4. Zurek, Sebastian & Guzik, Przemyslaw & Pawlak, Sebastian & Kosmider, Marcin & Piskorski, Jaroslaw, 2012. "On the relation between correlation dimension, approximate entropy and sample entropy parameters, and a fast algorithm for their calculation," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 391(24), pages 6601-6610.
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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. Lei Zhang & Liang Zhang & Qian Zhang & Kuan Jiang & Yuan Tie & Songling Wang, 2018. "Effects of the Second-Stage of Rotor with Single Abnormal Blade Angle on Rotating Stall of a Two-Stage Variable Pitch Axial Fan," Energies, MDPI, vol. 11(12), pages 1-18, November.
    4. 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).
    5. 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).
    6. Jiao, Weixuan & Chen, Hongjun & Cheng, Li & Zhang, Bowen & Gu, Yangdong, 2023. "Energy loss and pressure fluctuation characteristics of coastal two-way channel pumping stations under the ultra-low head condition," Energy, Elsevier, vol. 278(PA).
    7. Chengshuo Wu & Jun Yang & Shuai Yang & Peng Wu & Bin Huang & Dazhuan Wu, 2023. "A Review of Fluid-Induced Excitations in Centrifugal Pumps," Mathematics, MDPI, vol. 11(4), pages 1-20, February.

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