Pressure-Sensitive Paint Measurement of Pressure Distribution in a Supersonic Micronozzle

AIAA Journal ◽  
2008 ◽  
Vol 46 (1) ◽  
pp. 215-222 ◽  
Author(s):  
H. Nagai ◽  
R. Naraoka ◽  
K. Sawada ◽  
K. Asai
Keyword(s):  
Pressure Distribution ◽  
Pressure Sensitive Paint ◽  
Pressure Sensitive

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

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Tomohiko Ise ◽  
Shuma Kobayashi ◽  
Kazuhiro Itoh ◽  
Toshihiko Asami
Keyword(s):  
Pressure Distribution ◽  
Complementary Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Pressure Sensitive Paint ◽  
Pressure Sensitive ◽  
Temperature And Pressure ◽  
Gas Bearing ◽  
Luminescence Characteristics ◽  
Gas Supply ◽  
Good Agreement

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.

Global flow visualization of transonic cavity flow with various yaw angles

2021 ◽  
pp. 095441002098408
Author(s):  
Chih-Yung Huang ◽  
Chen-Yen Yeh ◽  
Yun-Fang Lin ◽  
Kung-Ming Chung
Keyword(s):  
Pressure Distribution ◽  
Pressure Rise ◽  
Cavity Flow ◽  
Cavity Flows ◽  
Cavity Model ◽  
Pressure Sensitive Paint ◽  
Global Flow ◽  
Closed Cavity ◽  
Pressure Sensitive ◽  
Gradual Pressure

This study experimentally investigated transonic cavity flows with different length-to-depth ( L/ h) ratios and yaw angles. Two rectangular models with L/ h = 6.14 and 21.5 were examined with yaw angles of 10°, 30°, and 45° under a flow of Mach 0.83. The flow was visualized using pressure-sensitive paint (PSP) to obtain the detailed pressure distribution inside the cavity models. The acquired PSP data were compared with experimental data measured using Kulite transducers, and these data showed favorable agreement. Gradual pressure increases inside the cavity model with L/ h = 6.14 were observed from the PSP measurements as open cavity flow. The flow impingement at the bottom of the cavity and the significant pressure rise inside the cavity model with L/ h = 21.5 were observed as closed cavity flow. The present study quantitatively visualized the evolution of the pressure distribution from symmetric to asymmetric for different yaw angles using porous PSP sensors.

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