Three-Dimensional Measurements of the Velocity in the Near Flow Field of a Full-Scale Hovering Rotor
MISSISSIPPI STATE UNIV MISSISSIPPI STATE DEPT OF AEROPHYSICS AND AEROSPACE ENGINEERING
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An experimental investigation of the flow field of a hovering helicopter rotor was initiated at Mississippi State University in 1970. The initial results of this work were reported in USAAMRDL TR 72-33. The current report presents additional experimental results obtained during a continuation of the rotor flow study. The experimental measurements were performed on the Mississippi State University rotor whirl tower which was equipped with a 33.5- foot diameter, OH-23B two-bladed rotor. The measurements consisted primarily of velocity surveys of the rotor inflow and wake with measurements below the rotor being confined to the region just below the blades. Some experiments were also performed to determine boundary layer flow phenomena by use of the chemical sublimation technique.