Accession Number:

ADA229495

Title:

Study of Three-Dimensional Pressure-Driven Turbulent Boundary Layer

Descriptive Note:

Technical rept. 1 Dec 1988-31 Aug 1990,

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE AND OCEAN ENGINEERING

Personal Author(s):

Report Date:

1990-08-31

Pagination or Media Count:

499.0

Abstract:

A three dimensional, pressure driven turbulent boundary layer created by an idealized wing-body junction flow is experimentally studied. The body used is a 3 2 elliptical nosed NACA 0020 tailed symmetric profile which has a chord length of 30.5 cm 12 inches, maximum thickness of 7.17 cm 2.824 inches, height of 22.9 cm 9.016 inches. The body was sitting on a flat plate. The nominal reference velocity of the flow is 27 msec and the Reynolds number based on the momentum thickness at 0.75 chord upstream of the body on the centerline of the tunnel is approx. 5936. The data presented include time-mean static pressure, skin friction magnitude and direction on the wall, as well as the mean velocity and all Reynolds stresses at several stations on a line determined with the mean velocity vector component parallel to the wall in the layer where the normal stress is maximum. The mean velocity and stress data were obtained both with hot-wire HW and laser-Doppler-velocimeter LDV techniques. The LDV measurement were taken twice due to the differences observed between the HW and LDV data, which is also shown with the present study. This gave a chance to study the uncertainties on the mean velocity and the stresses extensively. Pressure on the bottom plate were obtained with a Scanivalve and an inclined manometer. SDW

Subject Categories:

  • Aerodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE