Accession Number : ADP005040

Title :   Unsteady Interactions of Transonic Airfoils with Gusts and Concentrated Vortices,

Corporate Author : NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : McCroskey,W. J. ; Srinivasan,G. R.

Report Date : NOV 1985

Pagination or Media Count : 7

Abstract : Unsteady interactions of strong concentrated vortices, distributed gusts, and sharp-edged gusts with stationary airfoils have been analyzed in two-dimensional transonic flow. A simple and efficient method for introducing such vortical disturbances has been implemented in numerical codes that range from inviscid, transonic small-disturbance to thin-layer Navier Stokes. The numerical results demonstrate the large distortions in the overall flow field and in the surface air loads that are produced by various vortical interactions. The results of the different codes are in excellent qualitative agreement, but, as might be expected. the transonic small-disturbance calculations are deficient in the important region near the leading edge.

Descriptors :   *TRANSONIC AIRFOILS, *GUSTS, VORTICES, TWO DIMENSIONAL FLOW, PERTURBATIONS, TRANSONIC FLOW, LEADING EDGES, AERODYNAMIC LOADING, INTERACTIONS, FLOW FIELDS, DISTORTION, NUMERICAL METHODS AND PROCEDURES

Distribution Statement : APPROVED FOR PUBLIC RELEASE