Basu

Beddoes

Bergami

Bisplinghoff

Buhl

Chow

Gaunaa

Giesing

Graham

Hansen

Hess

Karman

Leishman

Lobitz

Snel

The aeroelastic response of wind turbines is often simulated in the time domain by using indicial response techniques. Unsteady aerodynamics in attached flow are usually based on Jones's approximation of the flat plate indicial response, although the response for finite‐thickness airfoils differs from the flat plate one. The indicial lift response of finite‐thickness airfoils is simulated with a panel code, and an empirical relation is outlined connecting the airfoil indicial response to its geometric characteristics. The effects of different indicial approximations are evaluated on a 2D profile undergoing harmonic pitching motion in the attached flow region; the resulting lift forces are compared with computational fluid dynamics (CFD) simulations. The relevance for aeroelastic simulations of a wind turbine is also evaluated, and the effects are quantified in terms of variations of equivalent fatigue loads, ultimate loads, and stability limits. The agreement with CFD computations of a 2D profile in harmonic motion is improved by the indicial function accounting for the finite‐thickness of the airfoil. Concerning the full wind turbine aeroelastic behavior, the differences between simulations on the basis of Jones's and finite‐thickness indicial response functions are rather small; Jones's flat‐plate approximation results in only slightly larger fatigue and ultimate loads, and lower stability limits. Copyright © 2012 John Wiley &amp; Sons, Ltd

Bergami, Leonardo

Gaunaa, Mac

Heinz, Joachim Christian

Online Research Database In Technology

Indicial lift response function: an empirical relation for finite‐thickness airfoils, and effects on aeroelastic simulations

Leonardo Bergami

Mac Gaunaa

Joachim Heinz

Crossref

Wind Energy

Indicial lift response function: an empirical relation for finite-thickness airfoils, and effects on aeroelastic simulations

http://orbit.dtu.dk/ws/files/96643358/Indicial_lift_response_function.pdf

Indicial lift response function: an empirical relation for finite‐thickness airfoils, and effects on aeroelastic simulations

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