Accession Number:

ADA275678

Title:

Boundary Layers Induced by Three-Dimensional Vortex Loops

Descriptive Note:

Final rept. 1 May 1989-31 Aug 1993

Corporate Author:

OHIO STATE UNIV COLUMBUS DEPT OF MECHANICAL ENGINEERING

Report Date:

1993-12-01

Pagination or Media Count:

320.0

Abstract:

The flow field generated by a helicopter in flight is extremely complex and it has been recognized that interactions between different components can significantly affect helicopter performance. In particular, the effects of the interaction between the rotor wake and the helicopter fuselage are extremely difficult to predict and pose a challenging problem for researchers and designers in the rotorcraft area. In the present work, a model for the interaction of a rotor-tip-vortex with the airframe of a helicopter is developed. The present report describes the calculation of the motion of the tip-vortex toward the airframe, the calculation of the induced pressure on the airframe, and the calculation of the boundary-layer flow under the vortex during the time period prior to the time when a portion of the tip-vortex collides with the airframe.

Subject Categories:

  • Aerodynamics
  • Helicopters
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE