Receptivity Measurements on a Swept-Wing Model Conference Paper uri icon

abstract

  • Flight tests were performed using a swept-wing model mounted on a Cessna O-2A aircraft. The crossflow waves on the airfoil were excited by pneumatic spanwise-periodic, distributed roughness elements (DREs). The objective of the experiment was to determine the roughness receptivity i.e. the relationship between roughness height and the amplitude of the unstable crossflow wave. The local skin-friction variation was measured using an array of calibrated and temperature-compensated hotfilm sensors. The amplitudes of the disturbance shear stress were compared to the amplitudes of the DREs. The measurements were very complex and it was found that there is a relationship between the measured shear stress and DRE amplitude exists.. It was most interesting to find that the sensitivity of the crossflow to DREs is highly dependent on the freestream turbulence levels. © 2011 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

author list (cited authors)

  • Woodruff, M., Saric, W., & Reed, H.

citation count

  • 5

publication date

  • June 2011