Two-Dimensional URANS Numerical Investigation of Critical Parameters on a Pitch Oscillating VAWT Airfoil under Dynamic Stall

Tariq Ullah, Krzysztof Sobczak, Grzegorz Liśkiewicz and Amjid Khan
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Tariq Ullah: Faculty of Mechanical Engineering, Institute of Turbomachinery, Lodz University of Technology, 90-924 Lodz, Poland
Krzysztof Sobczak: Faculty of Mechanical Engineering, Institute of Turbomachinery, Lodz University of Technology, 90-924 Lodz, Poland
Grzegorz Liśkiewicz: Faculty of Mechanical Engineering, Institute of Turbomachinery, Lodz University of Technology, 90-924 Lodz, Poland
Amjid Khan: School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078, USA

Energies, 2022, vol. 15, issue 15, 1-19

Abstract: In this paper, a thorough 2D unsteady computational fluid dynamic analysis was performed on a pitching airfoil to properly comprehend the dynamic stall and aerodynamic forces. The computational software ANSYS Fluent was used to solve the unsteady Reynolds-averaged Navier–Stokes equations. Low Reynolds number flows were modeled using the k-ω shear stress transport turbulence model. Aerodynamic forces, fluid flow structures, and flow separation delay angles were explored as a function of the Reynolds number, reduced frequency, oscillation amplitude, and mean angle of attack. The maximum aerodynamic forces, including lift, drag, and the onset of the dynamic stall, were all influenced by these variables. The critical parameters that influenced the optimum aerodynamic forces and ended up causing dynamic stall delay were oscillation amplitude and mean angle of attack. The stall angle was raised by 9° and 6°, respectively, and a large increment in the lift coefficient was also noted in both cases. Additionally, for the highest Reynolds number, a considerable rise in the maximum lift coefficient of 20% and a 28% drop in drag coefficient were observed, with a 1.5° delay in the stall angle. Furthermore, a significant increase of 33% in the lift force was seen with a rise of 4.5° in the stall angle in the case of reduced frequency.

Keywords: pitch oscillating airfoil; dynamic stall; unsteady aerodynamics; computational fluid dynamics (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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