American Journal of Renewable and Sustainable Energy
Articles Information
American Journal of Renewable and Sustainable Energy, Vol.1, No.1, May 2015, Pub. Date: May 6, 2015
Comparative Numerical Study of Turbulence Models for Analysis a Commercial HAWT Performance
Pages: 9-15 Views: 3254 Downloads: 1460
Authors
[01] Mojtaba Tahani, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran.
[02] Hamid Hosseinzadegan, Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA.
[03] Mohsen Moradi, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran.
Abstract
In the present work, four turbulence models and their precision on results for twenty-two cases of different wind speeds, ranging from cut-in to cut-off values, and associated mean pitch angles of blades are investigated numerically. The results of 3D finite volume simulations of airflow around a commercial Vestas V80 horizontal axis wind turbine (HAWT), with a rated output power of 2 MW, are presented. The grid used in the simulations consists of two main parts i.e. unstructured mesh rotating with blades and structured hexahedral stationary one for the external domain. Several cases with different free stream velocities (and different tip speed ratios and mean pitch angles) are studied, employing four different turbulence models: k-ω SST, υ ̅^2-f, k-ε RNG and Spalart-Allmaras one-equation, in order to examine their ability to predict the output generated power of HAWTs. The investigation outcomes are compared with each other and existing experimental result given in previous studies. It is shown that the numerical results are in acceptable agreement with experiments. Regarding assumptions during simulations, more sensible output power values are obtained through k-ε RNG and υ ̅^2-f models. In addition, maximum value of power coefficient occurs at more accurate associated wind speed using υ ̅^2-f model. The simulations provide useful guidelines to design more efficient large commercial wind turbines.
Keywords
CFD, HAWT, Output Power, Turbulence Modelling, Vestas V80
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