Accession Number : ADA139836

Title :   Experimental Investigation of the Turbulent Large Scale Temporal Flow in the Wing-Body Junction.

Descriptive Note : Doctoral dissertation,


Personal Author(s) : Rood,E P , Jr

PDF Url : ADA139836

Report Date : Mar 1984

Pagination or Media Count : 271

Abstract : An experimental investigation of the fluid dynamic flow in the wing-body junction was made to reveal the existence of large scale, time-dependent structures. These temporal features are discussed relative to the three major parts of the mean flow: the onset boundary layer, the wing-body junction flow characterized by the horseshoe root vortex, and the wing-body junction wake flow. Distinct flow structures, distinguished by bandwidths, were observed in all parts of the flow. One type of structure was due to the distortion of the existing structure of the onset boundary layer by the wing. A second and a third structure were newly created in the flow by the presence of the wing. These unique structures along the body were boundary layer phenomena, clearly distinguishable from ordinary Strouhal-type shedding at the wing trailing edge. The measurements distinguishing the structures were made using applications of two-point spectral correlation analyses of the flow velocities. The application of this estbalished procedure was made possible by modern high speed data techniques. An orderly framework of definitions and discussion is presented around which additional research can be performed to discover the details of the flow structure. (Author)

Descriptors :   *Boundary layer flow, *Wing body configurations, *Turbulent flow, Junctions, Aerodynamic configurations, Turbulent boundary layer, Vortices, Wings, Wake, Velocity, Mean, Spectrum analysis, Correlation, Oscillation, Time dependence, Low frequency

Subject Categories : Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE