SOME TIME-DEPENDENT FEATURES OF TURBULENT APPENDAGE-BODY JUNCTURE FLOWS

The time-dependent and time-averaged features of the wing-body junction flow formed around a wing with a 1.5:1 elliptical nose and a NACA 0020 tail have been studied. The first results of this study are presented. Surface pressure measurements and oil-flow visualisations have been obtained on the flat wall surrounding the wing. Measurements of mean velocity and turbulent stresses have been made with a single hot-wire probe in the region surrounding the nose of the wing. Histograms of streamwise velocity fluctuations obtained in the nose region suggest the presence of low-frequency fluctuations in the flow here. These may be due to low frequency changes in the size or position of the junction vortex. An array of surface hot-wire sensors have been constructed to enable instantaneous spanwise distributions of skin friction to be measured. Some preliminary results of this technique are presented.