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Flow visualization and flow field measurements of a 1/12 scale tilt rotor aircraft in hoverThe results are given of flow visualization studies and inflow velocity field measurements performed on a 1/12 scale model of the XV-15 tilt rotor aircraft in the hover mode. The complex recirculating flow due to the rotor-wake-body interactions characteristic of tilt rotors was studied visually using neutrally buoyant soap bubbles and quantitatively using hot wire anemometry. Still and video photography were used to record the flow patterns. Analysis of the photos and video provided information on the physical dimensions of the recirculating fountain flow and on details of the flow including the relative unsteadiness and turbulence characteristics of the flow. Recirculating flows were also observed along the length of the fuselage. Hot wire anemometry results indicate that the wing under the rotor acts to obstruct the inflow causing a deficit in the inflow velocities over the inboard region of the model. Hot wire anemometry also shows that the turbulence intensities in the inflow are much higher in the recirculating fountain reingestion zone.
Document ID
19930045444
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Coffen, Charles D.
(NASA Ames Research Center Moffett Field, CA, United States)
George, Albert R.
(NASA Ames Research Center Moffett Field, CA, United States)
Hardinge, Hal
(NASA Ames Research Center Moffett Field, CA, United States)
Stevenson, Ryan
(Cornell Univ. Ithaca, NY, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: AHS and Royal Aeronautical Society, Technical Specialists' Meeting on Rotorcraft Acoustics(Fluid Dynamics, Philadelphia, PA, Oct. 15-17, 1991, Proceedings (A93-29401 10-71)
Publisher: American Helicopter Society
Subject Category
Aerodynamics
Accession Number
93A29441
Funding Number(s)
CONTRACT_GRANT: NAG2-554
Distribution Limits
Public
Copyright
Other

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