Application of pressure sensitive paint measurement to a low-solidity cascade diffuser of a transonic centrifugal compressor |
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| Authors: | Hayami H. Hojo M. Matsumoto M. Aramaki S. Yamada K. |
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| Affiliation: | 1.Institute of Advanced Material Study,Kyushu University,Fukuoka,Japan;2.Interdisciplinary Graduate School of Engineering Sciences,Kyushu University,Fukuoka,Japan;3.Tohoku University,Sendai,Japan;4.Sanki Shoji Co., Ltd.,Tokyo,Japan |
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| 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 thinlayer 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. |
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