Abstract
Pressure sensitive paint (PSP) is a novel measurement system developed to obtain surface pressure distribution on wind-tunnel testing models. The objective of the present work is to examine the feasibility of this novel surface pressure mapping technique for truly unsteady supersonic flow testing. Using a fast-responding porous PSP and a fast-framing complementary metal oxide semiconductor (CMOS) camera, we have measured unsteady flows induced in a two-dimensional Laval nozzle of a blow-down supersonic wind tunnel. The PSP used in this study was composed of a dye (bathophenanthroline ruthenium(II) complex, Ru(Ph 2-phen) and a silica-gel thin layer chromatography (TLC) plate, on which the dyes were absorbed. The PSP was illuminated by light-emitting-diode (LED) lamps. The results obtained by the present measurement system shows the starting process of supersonic wind tunnel at 5kHz frame rate.
