Measurements to Understand the Flow Mechanisms Contributing to Tandem Rotor Outwash

Downwash and outwash characteristics of a model-scale tandem-rotor system in the presence of the ground were analyzed by identifying and understanding the physical mechanisms contributing to the observed flow field behavior. A building block approach was followed in simplifying the problem, separati...

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Bibliographic Details
Main Authors: Ramasamy,Manikandan, Potsdam,Mark, Yamauchi,Gloria K
Format: Report
Language:English
Subjects:
brownout
downwash
flow fields
Flow visualization
Helicopter rotors
helicopters
High velocity
hovering
ige(in ground effect)
impinging jet formulation
outwash velocities
Rotary wing aircraft
rotor height
scale models
tandem rotor
VERTICAL TAKEOFF AIRCRAFT
whiteout
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Summary:Downwash and outwash characteristics of a model-scale tandem-rotor system in the presence of the ground were analyzed by identifying and understanding the physical mechanisms contributing to the observed flow field behavior. A building block approach was followed in simplifying the problem, separating the effects of the fuselage, effects of one rotor on the other, etc. Flow field velocities were acquired in a vertical plane at four aircraft azimuths of a small-scale tandem rotor system using the particle image velocimetry (PIV) technique for radial distances up to 4 times the rotor diameter. Results were compared against full-scale CH-47D measurements. AHS 71st Annual Forum , 21 May 2015, 23 May 2015,