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- Title
Loads Correlation of a Full-Scale UH-60A Airloads Rotor in a Wind Tunnel.
- Authors
Hyeonsoo Yeo; Romander, Ethan A.
- Abstract
Wind tunnel measurements of the rotor trim, blade airloads, and structural loads of a full-scale UH-60A Black Hawk main rotor are compared with calculations obtained using the comprehensive rotorcraft analysis CAMRAD II and a coupled CAMRAD II/OVERFLOW2 analysis. A speed sweep at constant lift up to an advance ratio of 0.4 and a thrust sweep at constant speed into deep stall are investigated. The coupled analysis shows significant improvement over comprehensive analysis. Normal force phase is better captured for all the test conditions examined. Pitching moment is better predicted, including the magnitude and phase of the two stall events in the fourth quadrant at the deeply stalled condition. Structural loads are, in general, improved with the coupled analysis, but the magnitude of chord bending moment is still significantly underpredicted. As there are three modes around 4 and 5/rev frequencies, the structural responses to the 5/rev airloads due to dynamic stall are magnified and thus accurate analysis of the deeply stalled condition is challenging.
- Subjects
WIND tunnel testing; BLACK Hawk (Military transport helicopter); MILITARY helicopter testing; THRUST -- Aerodynamics; ROTORS (Helicopters)
- Publication
Journal of the American Helicopter Society, 2013, Vol 58, p1
- ISSN
0002-8711
- Publication type
Article
- DOI
10.4050/JAHS.58.022003