Title: Numerical investigation on the exergetic performance of NREL airfoil families for wind turbine application
Authors: Seyed Mehdi Mortazavi; Siavash Sobhgahi
Addresses: Department of Energy Engineering, College of Energy and Environment, Science and Research branch of Azad University, Tehran 1477893855, Iran ' Institute of Aerospace Designs, Technologies and Management Systems, Moscow State Aviation Technological University, Moscow 121552, Russia
Abstract: Increment of extracting wind energy efficiency via wind turbines substantially depends on a consummate understanding of the process of conversion of wind energy to useful work. In this study, the performances of three different National Renewable Energy Laboratory airfoil families are numerically investigated using a 2D incompressible unsteady computational fluid dynamics (CFD) solver and exergy analysis. The results indicate that the flow conditions possessing highest magnitudes of lift force do not obligatory represent the topmost exergetic efficiency; furthermore, it is concluded that the most exergetic effective flow condition can represent lowest drag to lift ratio. Dissipated exergy evaluation is demonstrated to assists defining how much of the inlet exergy would remain available in downstream. The results of an exergy analysis provide influential insights over different aspects of flow over airfoils and can be useful in wind engineering.
Keywords: wind turbine airfoils; exergy efficiency; CFD; computational fluid dynamics; wind turbines; wind energy; wind power; exergy analysis.
International Journal of Exergy, 2015 Vol.18 No.4, pp.387 - 401
Received: 03 Apr 2014
Accepted: 16 Nov 2014
Published online: 07 Nov 2015 *