Abstract
Combined measurement of shape and aerodynamic force is effective for understanding the mechanism of transonic wing flutter. To explore one method, a random-dot pressure-sensitive paint (PSP) was applied to the time-resolved global measurement of the deformation and pressure field of a transonic flow over an airfoil. The random-dot PSP has a patterned texture with luminescence intensity, which is made by intentional photodegradation of a PSP dye. These dots allow simultaneous measurement of pressure and the surface profile of the airfoil using stereo-digital image correlation. The feasibility of the random-dot PSP was tested in a transonic wind tunnel using a three-dimensional backswept wing model, which started to flutter at Mach 0.89 with a dominant frequency of 100 Hz. The unsteady surface profile and pressure distribution of the airfoil were measured using 12-bit high-speed cameras as the deformation amplitude increased. The experimental results indicate that the deformation and surface pressure distribution during flutter were successfully measured over time. The accuracy of the measured deformations and pressures was evaluated by comparison with several point data obtained with a laser displacement meter and semiconductor pressure transducers. The accuracy at each time-resolved image obtained at a recording rate of 6.25 kHz was within 1 mm for displacement and about 1 kPa for pressure.
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Acknowledgements
Masato Imai gratefully acknowledges the support from the Support for Pioneering Research Initiated by the Next Generation of FLOuRISH Institute, Tokyo University of Agriculture and Technology (TUAT), granted by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. We would like to thank Dr. Kenichi Saitoh, Mr. Tsutomu Nakajima, and all the members of the Transonic Flutter Wind Tunnel for preparing and conducting the wind tunnel test. We also thank Mr. Taiga Ueno, an undergraduate student of TUAT, for helping us measure the PSP calibration data.
Funding
The present study was supported by Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research (KAKENHI) Grant Numbers JP19H02063 and JP22H01396.
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KN was involved in conceptualization and resources. KN and MI were involved in methodology. MI was involved in formal analysis and investigation and writing—original draft preparation. MK was involved in writing—review and editing, funding acquisition, and supervision.
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Imai, M., Nakakita, K. & Kameda, M. Random-dot pressure-sensitive paint for time-resolved measurement of deformation and surface pressure of transonic wing flutter. Exp Fluids 63, 174 (2022). https://doi.org/10.1007/s00348-022-03527-1
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DOI: https://doi.org/10.1007/s00348-022-03527-1