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Article

Numerical Study of the Effect of the Reynolds Number and the Turbulence Intensity on the Performance of the NACA 0018 Airfoil at the Low Reynolds Number Regime

Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, 00-665 Warsaw, Poland
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Author to whom correspondence should be addressed.
Academic Editor: Li Xi
Processes 2022, 10(5), 1004; https://doi.org/10.3390/pr10051004
Received: 6 May 2022 / Revised: 14 May 2022 / Accepted: 16 May 2022 / Published: 18 May 2022
(This article belongs to the Special Issue Advancement in Computational Fluid Mechanics and Optimization Methods)
In recent years, there has been an increased interest in the old NACA four-digit series when designing wind turbines or small aircraft. One of the airfoils frequently used for this purpose is the NACA 0018 profile. However, since 1933, for over 70 years, almost no new experimental studies of this profile have been carried out to investigate its performance in the regime of small and medium Reynolds numbers as well as for various turbulence parameters. This paper discusses the effect of the Reynolds number and the turbulence intensity on the lift and drag coefficients of the NACA 0018 airfoil under the low Reynolds number regime. The research was carried out for the range of Reynolds numbers from 50,000 to 200,000 and for the range of turbulence intensity on the airfoil from 0.01% to 0.5%. Moreover, the tests were carried out for the range of angles of attack from 0 to 10 degrees. The uncalibrated γReθ transition turbulence model was used for the analysis. Our research has shown that airfoil performance is largely dependent on the Reynolds number and less on the turbulence intensity. For this range of Reynolds numbers, the characteristic of the lift coefficient is not linear and cannot be analyzed using a single aerodynamic derivative as for large Reynolds numbers. The largest differences in both aerodynamic coefficients are observed for the Reynolds number of 50,000. View Full-Text
Keywords: computational fluid dynamics; Reynolds-averaged Navier–Stokes; unsteady; turbulent; aerodynamic; airfoil; NACA 0018; lift force; drag force; vertical axis wind turbine computational fluid dynamics; Reynolds-averaged Navier–Stokes; unsteady; turbulent; aerodynamic; airfoil; NACA 0018; lift force; drag force; vertical axis wind turbine
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MDPI and ACS Style

Michna, J.; Rogowski, K. Numerical Study of the Effect of the Reynolds Number and the Turbulence Intensity on the Performance of the NACA 0018 Airfoil at the Low Reynolds Number Regime. Processes 2022, 10, 1004. https://doi.org/10.3390/pr10051004

AMA Style

Michna J, Rogowski K. Numerical Study of the Effect of the Reynolds Number and the Turbulence Intensity on the Performance of the NACA 0018 Airfoil at the Low Reynolds Number Regime. Processes. 2022; 10(5):1004. https://doi.org/10.3390/pr10051004

Chicago/Turabian Style

Michna, Jan, and Krzysztof Rogowski. 2022. "Numerical Study of the Effect of the Reynolds Number and the Turbulence Intensity on the Performance of the NACA 0018 Airfoil at the Low Reynolds Number Regime" Processes 10, no. 5: 1004. https://doi.org/10.3390/pr10051004

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