Aerodynamic Damping of Blade Flap Motions at High Angles of Attack

[+] Author and Article Information
A. C. Hansen

Mechanical Engineering Department, University of Utah, Salt Lake City, UT 84112

J. Sol. Energy Eng 117(3), 194-199 (Aug 01, 1995) (6 pages) doi:10.1115/1.2847781 History: Received October 29, 1994; Revised January 12, 1995; Online February 14, 2008


The YawDyn computer code is used to calculate the aerodynamic damping for a typical teetering rotor configuration. The code has been modified to calculate the net work done by aerodynamic forces in one complete rotor revolution. All cases were run for a teetering rotor similar to the ESI-80 with a specified teeter angle motion in order to isolate the aerodynamic effects from the inertial and gravitational loads. Effects of nonlinear static stall, dynamic stall, dynamic inflow, and delayed static stall due to rotation are analyzed separately and in combinations to explain the stability of flap motions in high winds. Contributions of the various steady and unsteady aerodynamic effects are presented for two airfoils: the LS(1) and the NREL Thin Airfoil Family (S805A, S806, S807). Teeter stability is compared for a blade with 10 deg of linear twist and a blade with optimum aerodynamic twist.

Copyright © 1995 by The American Society of Mechanical Engineers
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