Accession Number : ADA306198

Title :   Interaction of Complex Vorticity Fields with Aerodynamic Surfaces: Sources of Buffeting-Induced Loading and Vibration.

Descriptive Note : Final rept. 1 Dec 92-30 Nov 95,

Corporate Author : LEHIGH UNIV BETHLEHEM PA DEPT OF MECHANICAL ENGINEERING AND MECHANICS

Personal Author(s) : Rockwell, Donald

PDF Url : ADA306198

Report Date : 22 JAN 1996

Pagination or Media Count : 18

Abstract : The central goal of this program is to determine the origin of unsteady loading on a fin or blade in terms of the instantaneous velocity and vorticity fields associated with an incident vortex. New techniques of high-image-density particle image velocimetry provide the first instantaneous, global representations of the crucial features of this class of flows. The basic mechanisms of distortion of quasi two dimensional and three dimensional vortices, including the case of a broken-down vortex, as the vortex encounters the leading edge of the fin or blade, provide fundamental insight into this class of flow-structure interaction. The instantaneous flow structure provides a basis for interpretation of time-averaged surface pressure and acceleration measurements obtained in both the present and previous investigations. Knowledge of the flow patterns is expected to lead, in turn, to new techniques for control of the unsteady loading.

Descriptors :   *VORTICES, *BUFFETING, *AERODYNAMIC LOADING, *AERODYNAMIC CONTROL SURFACES, VELOCITY, MEASUREMENT, VIBRATION, GLOBAL, INTERACTIONS, TWO DIMENSIONAL, ACCELERATION, TIME, THREE DIMENSIONAL, FLOW FIELDS, SURFACE PROPERTIES, PRESSURE, PATTERNS, LEADING EDGES, MEAN, DISTORTION, DELTA WINGS.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE