Accession Number : ADA298038

Title :   Experimental Investigation of Three-Dimensional Vortex-Airfoil Interaction in A Supersonic Stream.

Descriptive Note : Final rept. 21 Mar 94-30 Jun 95,

Corporate Author : POLYTECHNIC UNIV BROOKLYN NY DEPT OF AEROSPACE ENGINEERING

PDF Url : ADA298038

Report Date : JUL 1995

Pagination or Media Count : 82

Abstract : An experimental study of the interaction between stream-wise vortices and a two-dimensional surface was conducted in a Mach 2.5 flow. The influence of oblique shock wave intensity on the inherently three-dimensional interaction was examined for vortices of variable strength. Planar laser sheet visualizations of the flowfield generated by the interaction at several distances downstream of the wedge leading edge were performed in order to gain an understanding of vortex behavior at distances further downstream. Results indicated that the interaction of a moderate strength vortex with an oblique shock wave leads to the formation of a steady separated shock structure upstream of the oblique shock front. Planar laser sheet visualization of the flowfield revealed an expansion of the vortex core in crossing a strong oblique shock front. The vortical structure was observed to persist along the entire chord of the shock generating wedge but was seen to diffuse with distances downstream of the wedge leading edge. Measurements of the vortex center above the wedge surface indicated that immediately downstream of the normal portion of the bulged-forward shock wave the vortex center was parallel to the direction of the free stream flow. (AN)

Descriptors :   *SHOCK WAVES, *VORTICES, *SUPERSONIC FLOW, PRESSURE GRADIENTS, EXPERIMENTAL DATA, PITCH(MOTION), ANGLE OF ATTACK, FLOW VISUALIZATION, FLOW FIELDS, WIND TUNNEL TESTS, LEADING EDGES, CALIBRATION, MACH NUMBER, FREE STREAM, PRESSURE DISTRIBUTION, GAS SURFACE INTERACTIONS, STAGNATION PRESSURE, WING TIPS, SPARK SHADOWGRAPH PHOTOGRAPHY, TRAILING EDGES, THREE DIMENSIONAL FLOW, STREAMLINE SHAPE.

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE