Computational Aerodynamic Analysis Of
Flatback Airfoils By Coupling N-S Equations And
Transition Prediction Codes
Author(s)
L. Deng, Y. W. Gao & J. T. Xiong
Abstract
Flatback (Blunt Trailing Edge) airfoils are adopted for the inboard region of
large wind turbine blade due to their structural and aerodynamic performance
advantages. Very limited experimental data at high Reynolds Number makes it
difficult for wind turbine designers to design and use these section shapes
because the wind tunnel experiments are limited by the Reynolds Number and
the solid blockage. In this study, a 2-D Reynolds-Average Navier- Stokes Solver
coupled with a transition prediction based on the eN method is used to CFD
computation of blunt trailing edge airfoils. A new coupling structure with a timeaccurate
transition prediction model taking the unsteady flow as a result of the
bluff-body vortex shedding into account is developed. The computational grid is
C-Grid generated by the tool of Gridgen, and the vertical angle at the blunt
trailing edge is smoothed slightly to increase the grid quality. An airfoil of
DU97-Flat modified by DU97-W-300 airfoil for wind turbine application is
calculated and effects of grid points are investigated. The aerodynamic
performance of DU97-W-300 is calculated and comparisons between the results
from literature and wind tunnel experimental data are performed, and the results
show that the method in present study can obtain the aerodynamics performance
with much less grid numbers while agreeing better with the wind tunnel
experimental data than the literature. One issue that requires attention is the
prediction of maximum lift and the failure to accurately capture stall behaviour
by the various computational techniques used in this study.
Keywords: wind turbine, airfoil, flatback airfoil, couple, transition prediction.
Keywords
wind turbine, airfoil, flatback airfoil, couple, transition prediction
Related Book
Other papers in this volume
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