Accession Number : AD0716023

Title :   Flow Visualization Studies of a Fin Protuberance Partially Immersed in a Turbulent Boundary Layer at Mach 5,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Winkelmann,Allen E.

Report Date : 20 MAY 1970

Pagination or Media Count : 55

Abstract : Various flow-visualization results are presented for a cylindrically blunted, unswept fin (yawed and unyawed) partially immersed in a turbulent boundary layer (delta approx. = 2.6 inches). The model, consisting of a fin-flat plate combination, was tested at a nominal Mach number of 5 and nominal free-stream Reynolds numbers per foot of 2800 000 and 7400 000. Azobenzene tests show regions of high heat transfer on the flat plate immediately upstream and downstream of the fin. Oil smear tests show in detail the surface shear directions and locations of separated flow which occur on the model. Schlieren and shadowgraph photographs indicate the complex shock wave structure which exists in front of the fin. A possible flow-field model is suggested to account for the observed flow patterns. (Author)

Descriptors :   (*TURBULENT BOUNDARY LAYER, HYPERSONIC CHARACTERISTICS), (*FINS, FLOW VISUALIZATION), FLOW FIELDS, FLAT PLATE MODELS, REYNOLDS NUMBER, HEAT TRANSFER, SCHLIEREN PHOTOGRAPHY, SHOCK WAVES, MATHEMATICAL MODELS, SHEAR STRESSES, SPARK SHADOWGRAPH PHOTOGRAPHY, PATTERN RECOGNITION, EXTENDABLE STRUCTURES

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE