Numerical investigation of saw-toothed and sine-curved tailing edge shape of NACA0012 aerofoil

Abstract

This paper investigates the saw-toothed and sine-curved tailing edge shape of the NACA0012 aerofoil at chord Reynolds numbers of 5.25×104, 1.05×105 and 2.10×105. Firstly, to examine the impact of the tailing edge shape to the flow behaviour and overall drag coefficient of the aerofoil. Secondly, to compare the drag coefficient for various speeds. The CFD RANS-SST with a commercial code ANSYS CFX simulation is performed for the fully submerged NACA0012 aerofoil of 150 mm chord length with three tailing edge shapes: standard straight line, saw-toothed and sine-curved shapes. The results show that a 25% increment of drag coefficient for saw-toothed tailing edge shape compared to the standard tailing edge shapes at Re = 5.25×104, and the increase of 14% at Re = 1.05×105 and 2.10×105. At Re= 5.25×104, the sine-curved tailing edge shape also caused a 16% of drag increment comparing with the standard tailing edge, while at = 1.05×105 and 2.10×105, the sine-curved tailing edge provided same drag results as the standard tailing edge. The result suggests that, in term of drag reduction, there is no benefit of using the alternative tailing edge shapes for NACA0012.

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ORCID for Philip A. Wilson: orcid.org/0000-0002-6939-682X

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