Affiliations: Institute of Advanced Material Study, Kyushu
University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan. | Interdisciplinary Graduate School of Engineering
Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580,
Japan. | Tohoku University, Aoba-ku, Sendai 980-8579,
Japan | Sanki Shoji Co., Ltd., 1-5-6 Higashinihonbashi,
Chuo-ku, Tokyo 103-0004, Japan.
Abstract: A pressure sensitive paint (PSP) measurement has been known as a
pressure field measurement technique based on the oxygen quenching phenomenon
of luminescence of specific luminophores. A PSP measurement was applied for
pressure field measurement in a low-solidity circular cascade diffuser of a
single-stage transonic centrifugal compressor with 5 in pressure ratio for
HFC134a gas. The oxygen concentration was about 500 ppm. Ru (bath-phen) was
adsorbed on a silica-gel thin-layer chromatography sheet, and the sheet was
pasted onto the side-wall between the cascade vanes. A drastic change in
luminescent intensity was recognized during a surge condition. Also the
pressure variations based on luminescent intensity agreed well with the
pressure fluctuations measured using a semiconductor pressure sensor with
high-frequency-response. It was shown that a PSP measurement worked well to
investigate the unsteady pressure fields in a circular cascade diffuser of a
transonic centrifugal compressor. Moreover, the time response of PSP becomes
clear as a problem to be overcome for the present.
