Accession Number : ADB008566

Title :   Characteristics of the Sidewall and Floor Boundary Layers in BRL Supersonic Wind Tunnel Number 1.

Descriptive Note : Final rept.,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Kitchens, Clarence W., Jr. ; Bush, Clarence C. ; Dedney, Raymond

Report Date : DEC 1975

Pagination or Media Count : 47

Abstract : Pitot pressure surveys have been taken to characterize the floor and sidewall boundary layers in this tunnel at free stream mach numbers, m = 1.50, 2.50, 3.50 and 4.50. The boundary-layer surveys cover the complete unit Reynolds number operating range of the facility. These surveys have been used to obtain Mach number distributions, mean velocity profiles and boundary-layer thicknesses. The data show that the sidewall and floor boundary layers have quite different thicknesses at the lowest tunnel supply pressures at m - 3.50 and (probably) 4.50. The boundary-layer thicknesses are not very different for other conditions. the sidewall profiles show considerable variation with M for a fixed momentum thickness Reynolds number; the floor profiles show less variation. Pressure gradient differences in the upstream flow may be responsible for the different characteristics of the sidewall and floor boundary layers. (Author)

Descriptors :   *BOUNDARY LAYER), (*SUPERSONIC WIND TUNNELS, (*TURBULENT BOUNDARY LAYER, SUPERSONIC WIND TUNNELS), PRESSURE GRADIENTS, FLOORS, SIDES, WALLS, THICKNESS, VARIATIONS, PITOT TUBES, REYNOLDS NUMBER, FREE STREAM, MACH NUMBER.

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE