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Technical Brief

Pressure Sensitive Paint Visualization of Pressure Distribution of Externally Pressurized Circular Thrust Gas Bearing With a Single Gas Supply Hole: Experimental Validation of Variation of Pressure Distribution by Supply Pressure

[+] Author and Article Information
Tomohiko Ise

Mem. ASME
Department of Mechanical Engineering,
Graduate School of Engineering,
Toyohashi University of Technology,
1-1 Hibarigaoka, Tempaku-cho,
Toyohashi 441-8580, Aichi, Japan
e-mail: ise@me.tut.ac.jp

Shuma Kobayashi

Kawasaki Heavy Industries, Ltd.,
1-1, Kawasaki-cho,
Akashi 673-8666, Hyogo, Japan

Kazuhiro Itoh

Associate Professor
Department of Chemical Engineering,
Graduate School of Engineering,
University of Hyogo,
2167 Shosha,
Himeji 671-2280, Hyogo, Japan

Toshihiko Asami

Professor
Mem. ASME
Department of Mechanical Engineering,
Graduate School of Engineering,
University of Hyogo,
2167 Shosha,
Himeji 671-2280, Hyogo, Japan

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 21, 2016; final manuscript received October 21, 2016; published online April 6, 2017. Assoc. Editor: Jordan Liu.

J. Tribol 139(5), 054501 (Apr 06, 2017) (5 pages) Paper No: TRIB-16-1167; doi: 10.1115/1.4035156 History: Received May 21, 2016; Revised October 21, 2016

This study investigated the use of pressure sensitive paint (PSP) as new measuring technique for measuring the pressure distribution of a gas bearing. An externally pressurized circular thrust gas bearing with single gas supply hole was used as the test bearing to investigate the suitability of this technique. The test bearing was 30 mm in diameter, with a gas supply hole of diameter 0.7 mm. A coat of PtTFPP, the substance used as the PSP, was applied to the bearing surface using an air-assisted spray. The PSP luminescence characteristics were calibrated before the tests because of their dependency on temperature and pressure. The pressure distribution was obtained by averaging 50 images captured by a 12-bit complementary metal-oxide semiconductor (CMOS) camera. These experimental results were compared with the results of a numerical analysis based on the divergence formulation method. There was good agreement between the experimental and analytical results, thus demonstrating the effectiveness of using PSP for pressure distribution measurements.

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Figures

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Fig. 1

Measurement mechanism for pressure distribution using PSP visualization

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Fig. 2

Physical model of circular thrust gas bearing used in numerical analysis

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Fig. 3

Gas flow in a segment

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Fig. 4

Schematic of experimental setup and top view photo of bearing surface

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Fig. 5

Measured thickness of the PSP with base coat

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Fig. 6

Measurements used to determine the Stern–Volmer coefficients A, B, and C

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Fig. 7

Measured pressure distribution of the bearing (Ps = 0.2 MPa): (a) contour and (b) distribution

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Fig. 8

Measured pressure distribution of the bearing (Ps = 0.3 MPa): (a) contour and (b) distribution

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Fig. 9

Measured pressure distribution of the bearing (Ps = 0.4 MPa): (a) contour and (b) distribution

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