An experimental study of a threedimensional pressuredriven turbulent boundary layer
Abstract
A 3D pressure driven turbulent boundary layer created by an idealized wingbody junction flow is experimentally studied. The body used is a 3:2 elliptical nosed NASA 0020 tailed symmetric profile which has a chord length of 30.5 cm, maximum thickness of 7.17 cm, and height of 22.9 cm. The nominal reference velocity of the flow is 27 m/sec 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 timemean 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 hotwire (HW) and laserDopplervelocimeter (LDV) techniques. This gave a chance to study the uncertainties on the mean velocity and the stresses extensively. Pressure distributions on the wing and on the bottom plate were obtained with a Scanivalve and an inclined manometer. The skin friction velocity is not the scale of the turbulence in such a flow. A collection of 3D turbulent boundary layer data including the present study is used to investigate the concept of the Law of the Wall velocity profile and the limitations of eddyviscosity turbulence models in 3D flows. For this purpose, several LawoftheWall velocity profile models and eddyviscosity models were tested.
 Publication:

Ph.D. Thesis
 Pub Date:
 1990
 Bibcode:
 1990PhDT.........8O
 Keywords:

 BodyWing Configurations;
 Flow Velocity;
 Pressure Distribution;
 Three Dimensional Boundary Layer;
 Turbulent Boundary Layer;
 Eddy Viscosity;
 Laser Doppler Velocimeters;
 Momentum;
 Reynolds Number;
 Skin Friction;
 Static Pressure;
 Turbulence Models;
 Velocity Distribution;
 Wall Flow;
 Fluid Mechanics and Heat Transfer