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Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera

Anthony Gardner, Christian Wolf, Miles Barnett, Markus Raffel, German Aerospace Center (DLR)
JT Heineck, NASA

May 13, 2019

https://doi.org/10.4050/F-0075-2019-14514

Abstract:
Boundary layer transition measurement was demonstrated using differential infrared thermography on the top side of a helicopter rotor in forward flight. The tests used a FLIR X8500xc SLS long wave infrared camera to observe the DLR EC135 test helicopter rotor. The boundary layer transition was detected for hover out of ground effect (150ft) and for forward flight at 80kt (1700ft). The measured boundary layer transition positions are consistent with previous measurements of the EC135 hovering in ground effect, and with predicted boundary layer transition positions. A method for the analysis of DIT images for a rotor in forward flight is shown, based on computational analysis of a pitching airfoil with varying inflow.


Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera

  • Presented at Forum 75 - Best Paper for this session
  • 13 pages
  • SKU # : F-0075-2019-14514
  • Winner of the Alfred Gessow Best Paper Award at Forum 75
  • Aerodynamics

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Helicopter Rotor Boundary Layer Transition Measurement in Forward Flight Using an Infrared Camera

Authors / Details:
Anthony Gardner, Christian Wolf, Miles Barnett, Markus Raffel, German Aerospace Center (DLR)
JT Heineck, NASA