DEVELOPMENT OF LASER LIFETIME PRESSURE SENSITIVE PAINT (PSP) TECHNIQUE FOR UNSTEADY MEASUREMENTS

This paper describes the development of the laser lifetime PSP measurement techniques suitable for turbine unsteady flow investigation. The PSP formulation used for this analysis is tris(2,2'-bipyridyl) ruthenium 'Ru(bpy)' adsorbed on a porous Thin Layer Chromatograph (TLC) Aluminum Oxide plastic binder. Two calibration methods (apriori and in-situ) are used with a quasi-continuous burst-mode laser system. The PSP lifetime decay (< 5 mu s) of each pixel is measured with both Hyper Vision HPV-X2 Shimadzu and Photron FASTCAM SAZ cameras. The in-situ wind tunnel calibration is applied to a wall mounted hump test case which imposes a pressure gradient representative of the aft portion of low pressure airfoil suction side.