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

Time- and spatially-resolved heat flux measurements are reported for the endwall surface in the turbulent. incompressible flow in the nose region 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 uniform temperature. 'rhe effects of cylindrical wing geometry on heat flux were investigated by taking heat nux measurements in the nose regions of a 3:2 elliptic nose/NACA 0020 tail shape, a circular cylinder with a wedge tail, and an NACA 0015. Heat flux rates were increased up to a factor of 3 over the heat flux rates in the approach boundary layer. The rms of the heat flux fluctuations were as high as 25% of the mean 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 unsteadiness of the vortex. A new three-dimensional extension of an existing correlation is proposed to account for the effects of the horseshoe vortex on heat transfer in this region. Adjacent to the wing the augmentation in heat flux is due to a change in the mean velocity field.