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Engineering Review : International journal for publishing of original researches from the aspect of structural analysis, materials and new technologies in the field of mechanical engineering, shipbuilding, fundamental engineering sciences, computer sciences, electrical engin, Vol.34 No.2 June 2014. -

This paper investigates the aerodynamic effects of waving bumps inspired by a humpback whale fin on the leading edge of a turbine blade. A comparison was made between performances of two isolated blades: a blade with a sinusoidally shaped bumped leading edge LE and one with a straight leading edge; both based on the same NACA0012 cross section profile. The simulations used a Reynolds number of 1.8·10^5 for a range of angles of attack from 0º to 30º. The results for the bumped blade have shown a substantial gain in aerodynamic characteristics for certain angles of attack AoA. At AoA larger than 10º, the bumped blade has shown an increase in lift 3%-9.5% and decreased drag, while negligible differences in lift and a smaller drag were exhibited for AoA smaller than 10º. Overall, the bumped blade provided greater advantage in lift to drag ratio approximately 50% over the AoA range from 0º to 20º. The sinusoidal leading edge also delayed the stall crisis, increasing the critical angle of attack by approximately 5º over the one for the blade with a straight leading edge.

wind turbine blade; aerodynamics; humpback whale; bumped leading edge; renewable energy

Autor: Zoran Čarija - Emil Marušić - Zdenko Novak - Sanjin Fućak - ; Department of Thermodynamics and Energy Engineering, Faculty of



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