Recent topics in fast-responding pressure-sensitive paint technology at National Aerospace Laboratory

This paper reviews the recent advances in fast-responding Pressure-Sensitive Paint (PSP) technology at National Aerospace Laboratory in Japan. Since NAL started a research program on PSP in 1994, much effort has been focused on the development of PSP for unsteady pressure measurements. In recent study, we have made a substantial progress in the fast PSP formulations. This includes the development of a PSP using a high polymer called poly(TMSP) and chemisorptive PSPs based on anodized-aluminum. To investigate the response characteristics of these paints, we have made systematic tests using a pressure chamber with a fast-acting solenoid-type valve and a shock tube. A summary of these experimental investigations is given in this paper with an emphasis on the relationship between the response time and the physical properties of binder materials. In addition, the feasibility tests conducted in a short-duration hypersonic shock tunnel and a shock tube are present.