Accession Number : ADA115871

Title :   Aerodynamics of Cones at High Angles of Attack in Low Subsonic Flow,

Corporate Author : NORWEGIAN DEFENCE RESEARCH ESTABLISHMENT KJELLER

Personal Author(s) : Botnan,Jan Ivar

PDF Url : ADA115871

Report Date : 08 Jun 1981

Pagination or Media Count : 56

Abstract : This report is a theoretical study of various phenomena observed in the low subsonic regime when a slender cone of revolution is pitched to high angles of attack. Three-dimensional boundary layers are calculated up to the line of primary separation. The structure of the separated wake is obtained with a two-dimensional model and the results are used as input in a leeside boundary layer calculation. This calculation is carried on to the line of secondary separation. The positions of separation are compared with experimental results. The wake is found to be unstable at the angles of attack where strong asymmetric forces are observed. A stability analysis of the boundary layer rules out streamwise-directed vortices as a contributor to the asymmetric forces. (Author)

Descriptors :   *Subsonic flow, *Conical bodies, *Angle of attack, Boundary layer flow, Three dimensional flow, Aerodynamics, Flow separation, Vortices, Two dimensional, High angles

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE