Dynamic stall and aerodynamic damping

Journal Article · Sun Aug 01 04:00:00 EDT 1999 · Journal of Solar Energy Engineering

DOI:https://doi.org/10.1115/1.2888426· OSTI ID:20001209

Rasmussen, F; Petersen, J T; Madsen, H A

A dynamic stall model is used to analyze and reproduce open air blade section measurements as well as wind tunnel measurements. The dynamic stall model takes variations in both angle of attack and flow velocity into account. The paper gives a brief description of the dynamic stall model and presents results from analyses of dynamic stall measurements for a variety of experiments with different airfoils in wind tunnel and on operating rotors. The wind tunnel experiments comprises pitching as well as plunging motion of the airfoils. The dynamic stall model is applied for derivation of aerodynamic damping characteristics for cyclic motion of the airfoils in flapwise and edgewise direction combined with pitching. The investigation reveals that the airfoil dynamic stall characteristics depend on the airfoil shape, and the type of motion (pitch, plunge). The aerodynamic damping characteristics, and thus the sensitivity to stall induced vibrations, depend highly on the relative motion of the airfoil in flapwise and edgewise direction, and on a possibly coupled pitch variation, which is determined by the structural characteristics of the blade.

• Research Organization: Risoe National Lab., Roskilde (DK)
• OSTI ID: 20001209
• Journal Information: Journal of Solar Energy Engineering, Journal Name: Journal of Solar Energy Engineering Journal Issue: 3 Vol. 121; ISSN JSEEDO; ISSN 0199-6231
• Country of Publication: United States
• Language: English

Related Subjects

17 WIND ENERGY
AERODYNAMICS
DAMPING
DESIGN
DYNAMICS
MECHANICAL VIBRATIONS
WIND TURBINES