Accession Number:

ADA247532

Title:

Study of the Leading-Edge Vortex Dynamics in the Unsteady Flow Over an Airfoil

Descriptive Note:

Final rept. 1 Jan 1990-31 Dec 1991

Corporate Author:

WASHINGTON STATE UNIV PULLMAN

Personal Author(s):

• Ramaprain, B. R.

Report Date:

1992-02-27

Pagination or Media Count:

54.0

Abstract:

The two-year project to study the dynamics of the leading-edge vortex LEV over a pitching airfoil under conditions of dynamic stall, was started in January 1990. Several accomplishments have been made during these two years. The most significant of these are 1 the construction of a special water channel suitable for the study of dynamic stall over a pitching airfoil, 2 the measurement of surface pressure distributions over the airfoil under several key operating conditions, and 3 development of the techniques of Particle Image Velocimetry PIV and its use in the measurement of instantaneous velocity and vorticity field in the two-dimensional flow around the airfoil. Some of these data which are the first of their kind have been used to understand the physics of unsteady vorticity dynamics over a pitching airfoil. These data are being made available to other investigators for use as database in validating their numerical models. Unsteady Aerodynamics, Dynamic Stall, Supermaneuverability, Vortex Dynamics.

Descriptors:

• *AIRFOILS
• *AERODYNAMICS
• *FLUID FLOW
• VELOCITY
• MEASUREMENT
• MODELS
• DYNAMICS
• TWO DIMENSIONAL
• WATER
• EDGES
• SURFACES
• PARTICLES
• CONSTRUCTION
• PHYSICS
• IMAGES
• PRESSURE
• LEADING EDGES
• FLOW
• TWO DIMENSIONAL FLOW
• CHANNELS

Subject Categories:

• Aerodynamics
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE