Affiliations: Department of Mechanical Engineering, Nagoya
University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan. E-mail:
[email protected]
Abstract: Recently optical pressure measurement systems using pressure
sensitive paints (PSP) have actively developed to measure continuous pressure
distributions on solid surfaces. However, the pressure range has been almost
limited above 130 Pa (about 1 Torr) and there is no application to lower
pressure range because the pressure sensitivity seems to be not so high in that
range. In this study, we have applied three types of PSP [two types are
composed by organic dye and polymer (luminophore/binder); PtOEP/GP197 and
PtTFPP/poly(TMSP), and another one is Bath-Ru adsorbed on anodized aluminum] to
the rarefied gas flow mainly lower than 130 Pa and examine those fundamental
properties such as pressure sensitivity, leading to selection of the most
suitable PSP among them for the low-pressure range. Since PtTFPP/poly(TMSP) has
the highest sensitivity, it is applied successfully to the measurement of the
two-dimensional pressure distribution on the surface interacting with a low
density supersonic free jet.
Keywords: PSP, Low density gas flow, Stern-volmer plot, Compressible flow