Application of TSP/PSP in a High Speed Cryogenic Wind Tunnel

Abstract

Temperature-Sensitive Paint (TSP) and Pressure-Sensitive Paint (PSP) technique have been applied in an industrial cryogenic wind tunnel to detect laminarturbulent boundary layer transition and to obtain absolute pressure distribution on a model surface in the European Transonic Windtunnel (ETW) at Cologne. Due to an optimization of the TSP test procedure, the detection of laminarturbulent transition was successfully achieved also at low Mach number, Ma = 0.2. First PSP measurements were performed as well in the pilot- and in the large wind tunnel (PETW and ETW). Here, the pressure sensitive dye PdTFPP/poly(TMSP) was applied to a 2D model and a full three dimensional model. First quantitative pressure distributions at 700 ppm oxygen concentration were obtained on the wing’s upper surface.