TIME-RESOLVED SURFACE HEAT-FLUX MEASUREMENTS IN THE WING-BODY JUNCTION VORTEX

Time- and spatially-resolved heat flux measurements are reported for t he endwall surface in the turbulent. incompressible flow in the nose r egion of a wing-body junction formed by a wing and a flat plate. Both the wing and the flat plate were heated and held at a constant and uni form temperature. 'rhe effects of cylindrical wing geometry on heat fl ux were investigated by taking heat nux measurements in the nose regio ns of a 3:2 elliptic nose/NACA 0020 tail shape, a circular cylinder wi th a wedge tail, and an NACA 0015. Heat flux rates were increased up t o a factor of 3 over the heat flux rates in the approach boundary laye r. The rms of the heat flux fluctuations were as high as 25% of the me an heat flux in the vortex-dominated nose region. Away from the wing, upstream of the time-averaged vortex center, augmentation in the heat flux is due to increased turbulent mixing caused by large-scale unstea diness of the vortex. A new three-dimensional extension of an existing correlation is proposed to account for the effects of the horseshoe v ortex on heat transfer in this region. Adjacent to the wing the augmen tation in heat flux is due to a change in the mean velocity field.