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

Nianxi Yue, Congxin Yang () and Shoutu Li
Additional contact information
Nianxi Yue: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Congxin Yang: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Shoutu Li: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Energies, 2024, vol. 17, issue 18, 1-20

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.

Keywords: VAWT; reduced frequency; numerical simulation; performance analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/18/4760/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/18/4760/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:18:p:4760-:d:1483976

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().