Tests were made in a two-dimensional insert at the University of Maryland's Glenn L. Martin subsonic wind tunnel to examine the effects of simulated ballistic damage on the aerodynamic characteristics of a UH-60A Black Hawk helicopter main rotor blade section. Tests were conducted on the undamaged blade section, and on the same section with simulated ballistic damage comprising a circular hole with a surrounding portion of the skin removed, exposing the internal honeycomb structure. The structural lift, drag and pitching moment were measured at small increments in angle of attack up through stall at Reynolds numbers of 100 and 2xl06. In addition, tests were conducted over a full 360-degree range in angle of attack for a Reynolds number of 106. The measurements were complemented by mini-tuft flow visualization on the upper wing section, particularly near the hole.... Rotor blades, Aerodynamics, Wind tunnel test, Ballistic damage.
Aerodynamic Characteristics of a Helicopter Rotor Airfoil as Affected by Simulated Ballistic Damage
1993
60 pages
Report
No indication
English
Aerodynamics , Aircraft , Aerodynamic characteristics , Damage , Helicopter rotors , Angle of attack , Ballistics , Drag , Flow visualization , Helicopters , Honeycomb structures , Inserts , Internal , Lift , Measurement , Moments , Reynolds number , Rotor blades , Structures , Subsonic wind tunnels , Test and evaluation , Two dimensional , Wind tunnel tests , Wings
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