TY - JOUR
T1 - Sub-millimeter resolution pressure measurement on free flight model at Mach 1.5 using novel non-intrusive optical technique
AU - Kurihara, Daiki
AU - Gonzales, Joseph P.
AU - Claucherty, Steven L.
AU - Kiritani, Hideki
AU - Fujita, Koji
AU - Jemcov, Aleksandar
AU - Nagai, Hiroki
AU - Sakaue, Hirotaka
N1 - Funding Information:
This project was supported by the Discretionary Collaborative Research fund, J17I101 , J18I101 and J19105 at the Institute of Fluid Science (IFS) at Tohoku University , and the Asia Research Collaboration Grant from Notre Dame International at the University of Notre Dame . The authors would also like to acknowledge Photron for their high-speed color camera support.
Funding Information:
This project was supported by the Discretionary Collaborative Research fund, J17I101, J18I101 and J19105 at the Institute of Fluid Science (IFS) at Tohoku University, and the Asia Research Collaboration Grant from Notre Dame International at the University of Notre Dame. The authors would also like to acknowledge Photron for their high-speed color camera support.
Publisher Copyright:
© 2020 Elsevier Inc.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - A motion-capturing pressure sensitive paint (PSP) system is developed and demonstrated by collecting transient pressure data on the surface of a 30 mm diameter sphere model in free flight at Mach 1.5, where a conventional pressure tap is unable to be mounted. The developed non-intrusive measurement technique is able to cancel out changes in signal intensity due to variations in illumination during free flight. Images of the sphere model are collected using a high-speed camera at a rate of 100 kHz with an exposure time of 3.75 μs. Motion blur is estimated as 6.5% of the sphere diameter. The sphere is fully in view for 7 frames, or 70 μs. Transient data from each frame is collected to produce a free flight pressure map on the surface. In order to validate the measurement, a time-averaged CFD simulation of a sphere model at Mach 1.5 is run using far field pressure boundary conditions and a mesh of 6.96 million cells. An uncertainty analysis is performed using the signal to noise ratio of the PSP measurement. The PSP measurement is in agreement with the CFD simulation quantitatively across a centerline pressure trace. The accuracy of the PSP measurement compared to the CFD simulation was within 7.4 kPa.
AB - A motion-capturing pressure sensitive paint (PSP) system is developed and demonstrated by collecting transient pressure data on the surface of a 30 mm diameter sphere model in free flight at Mach 1.5, where a conventional pressure tap is unable to be mounted. The developed non-intrusive measurement technique is able to cancel out changes in signal intensity due to variations in illumination during free flight. Images of the sphere model are collected using a high-speed camera at a rate of 100 kHz with an exposure time of 3.75 μs. Motion blur is estimated as 6.5% of the sphere diameter. The sphere is fully in view for 7 frames, or 70 μs. Transient data from each frame is collected to produce a free flight pressure map on the surface. In order to validate the measurement, a time-averaged CFD simulation of a sphere model at Mach 1.5 is run using far field pressure boundary conditions and a mesh of 6.96 million cells. An uncertainty analysis is performed using the signal to noise ratio of the PSP measurement. The PSP measurement is in agreement with the CFD simulation quantitatively across a centerline pressure trace. The accuracy of the PSP measurement compared to the CFD simulation was within 7.4 kPa.
KW - Free flight
KW - Pressure sensitive paint
KW - Transient measurement
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U2 - 10.1016/j.expthermflusci.2020.110243
DO - 10.1016/j.expthermflusci.2020.110243
M3 - Article
AN - SCOPUS:85091971880
SN - 0894-1777
VL - 120
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
M1 - 110243
ER -