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The Influence of Reduced Frequency on H-VAWT Aerodynamic Performance and Flow Field Near Blades

Author

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  • Nianxi Yue

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
    Gansu Provincial Technology Centre for Wind Turbines, Lanzhou 730050, China)

  • Congxin Yang

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
    Gansu Provincial Technology Centre for Wind Turbines, Lanzhou 730050, China)

  • Shoutu Li

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
    Gansu Provincial Technology Centre for Wind Turbines, Lanzhou 730050, China)

Abstract

Studies demonstrate that the reduced frequency k is influenced by the incoming wind speed U 0 and the rotor speed n . As a dimensionless parameter, k characterizes the stability of the flow field, which is a critical factor affecting the performance of vertical-axis wind turbines (VAWTs). This paper investigates the impact of k on the performance of straight-blade vertical-axis wind turbines (H-VAWT). The findings indicate that 0.05 is the critical value of k . The same k results in a similar flow field structure, yet the performance changes vary with different U 0 . A decrease in n or an increase in U 0 leads to an increase in the average value and fluctuation of k , which subsequently reduces the rotor rotation torque C m and decreases the maximum wind energy utilization rate Cp max . This reduction in Cp max weakens the stability of the flow field. Additionally, the high-speed area of the blade’s trailing edge velocity trajectory at θ = 0 ° , θ = 120 ° , and θ = 240 ° expands with increasing range. Velocity dissipation in the high-speed area of the trailing edge affects the stability of the flow field within the rotor.

Suggested Citation

  • Nianxi Yue & Congxin Yang & Shoutu Li, 2024. "The Influence of Reduced Frequency on H-VAWT Aerodynamic Performance and Flow Field Near Blades," Energies, MDPI, vol. 17(18), pages 1-20, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:18:p:4760-:d:1483976
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    References listed on IDEAS

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    1. Morgan Rossander & Eduard Dyachuk & Senad Apelfröjd & Kristian Trolin & Anders Goude & Hans Bernhoff & Sandra Eriksson, 2015. "Evaluation of a Blade Force Measurement System for a Vertical Axis Wind Turbine Using Load Cells," Energies, MDPI, vol. 8(6), pages 1-24, June.
    2. Gharali, Kobra & Johnson, David A., 2012. "Numerical modeling of an S809 airfoil under dynamic stall, erosion and high reduced frequencies," Applied Energy, Elsevier, vol. 93(C), pages 45-52.
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