Effect of the J-Shaped Wind Turbine Airfoil Opening Ratio and Thickness on the Performance of Symmetrical Airfoils

Al Hamad, Saif; Habash, Omar; Hasan, Alaa; Amano, Ryoichi S.

doi:10.1115/1.4053743

Title: Effect of the J-Shaped Wind Turbine Airfoil Opening Ratio and Thickness on the Performance of Symmetrical Airfoils

Journal Article · Mon Feb 21 00:00:00 EST 2022 · Journal of Energy Resources Technology

DOI:https://doi.org/10.1115/1.4053743· OSTI ID:1982932

Al Hamad, Saif ^[1]; Habash, Omar ^[1]; Hasan, Alaa ^[1]; Amano, Ryoichi S. ^[2]

Department of Mechanical Engineering, University of Wisconsin-Milwaukee, 3200 N. Cramer St., Room 775, Milwaukee, WI 53211
Department of Mechanical Engineering, University of Wisconsin-Milwaukee, 115 E. Reindl Way, Glendale, WI 53212

Abstract In this work, the effect of the inner opening ratio on the J-shaped airfoils aerodynamic performance was studied and documented for symmetrical airfoils. Three different airfoil thicknesses were investigated: small (NACA0008), medium (NACA0015), and large (NACA0024). For each airfoil thickness, effects of three inner opening ratios were analyzed: one-third, one-half, and two-thirds. The performance of each opening ratio was compared with the performance of the solid airfoil “zero opening ratio” for different angles of attack between 5 deg and 20 deg. All designs were simulated using the computational fluid dynamics (CFD) technology against experimental results for solid NACA4412 airfoil in the University of Wisconsin-Milwaukee (UWM) wind tunnel facility and other published experimental data. It was found that large eddy simulation yields accurate solutions with a smaller number of mesh cells compared to the k–ω turbulence model but with much longer computational time. The lift-to-drag ratio for all studied airfoils has a maximum value for solid airfoils compared to those equipped with openings. For airfoils equipped with 00.00% opening ratio “solid,” NACA0015 airfoil has the maximum lift-to-drag ratio. Furthermore, it was found that NACA0008 equipped with a 33.33% opening ratio has the best performance of all studied J-shaped airfoils.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE

OSTI ID:: 1982932

Journal Information:: Journal of Energy Resources Technology, Vol. 144, Issue 5; ISSN 0195-0738

Publisher:: ASME

Country of Publication:: United States

Language:: English

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