Accession Number:

ADA280444

Title:

Unsteady Flow Field of Large-Amplitude Pitching Airfoils

Descriptive Note:

Final technical rept. Jul 1992-Nov 1993

Corporate Author:

MICHIGAN STATE UNIV EAST LANSING DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1994-02-01

Pagination or Media Count:

33.0

Abstract:

This research program investigated the physical mechanisms involved in the onset of leading edge separation when airfoils pitch to high angles of attack. Both constant pitch rate and variable pitch rate motions were considered. The highlights of results from a combined experimental and computational effort are described in this report. The conclusions from this research indicate the need for boundary-layer resolved measurements of the flow behavior near the leading edge and the evolution of the reverse flow regions on the suction surface. Furthermore, the deliberate shaping of the pitch trajectory for the purpose of optimization of separation delay is suggested as one way to manage the flow and aerodynamic behavior of an airfoil. Dynamic Stall, Unsteady Separation

Subject Categories:

  • Aerodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE