Accession Number : ADA145107


Title :   Prediction of Aerodynamic Characteristics of Fighter Wings at High Angles of Attack.


Descriptive Note : Final technical rept. 15 Apr 82-31 Mar 84,


Corporate Author : ANALYTICAL METHODS INC REDMOND WA


Personal Author(s) : Maskew,B ; Vaidyanathan,T S ; Nathman,J K ; Dvorak,F A


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA145107


Report Date : Mar 1984


Pagination or Media Count : 133


Abstract : Potential modeling techniques for representing separated and vortical flows are investigated with the objective being the prediction of aerodynamic characteristics of fighter wings at high angles of attack. A low-order surface singularity panel method is coupled with iterative routines for locating the force free wake and for including viscous effects and edge vortices. The viscous effects are computed using integral boundary layer procedures and the displacement effect is represented in the panel method using the transpiration model. Regions of massive separation are enclosed in free vortex sheets which are included in the general wake configuration scheme of the panel method. Calculations show encouraging results in those cases where there is little cross flow inside the separated zone. The calculations were less successful when the separated zone became highly three-dimensional, as in the case of a vortex/surface interaction. The modeling technique promises to be a practical, cost effective approach to predicting the aerodynamic characteristics of fighter wings at high angle of attack; however, further development of the model is required for the highly three-dimensional separated zones involving strong vortical action. (Author)


Descriptors :   *MATHEMATICAL MODELS , *VORTICES , *WINGS , *FLOW SEPARATION , INTERACTIONS , DISPLACEMENT , BOUNDARY LAYER , ANGLE OF ATTACK , SURFACES , MATHEMATICAL PREDICTION , SHEETS , AERODYNAMIC CHARACTERISTICS , WAKE , JET FIGHTERS , LEADING EDGES , VISCOUS FLOW , ITERATIONS , DELTA WINGS , POTENTIAL FLOW , HIGH ANGLES , WING TIPS , THREE DIMENSIONAL FLOW , CRANKED WINGS


Subject Categories : Numerical Mathematics
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE