Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry

0549593 - ÚT 2022 RIV CH eng J - Journal Article
Psota, P. - Cubreli, G. - Hála, Jindřich - Šimurda, David - Šidlof, P. - Kredba, J. - Stašík, M. - Lédl, V. - Jiránek, M. - Luxa, Martin - Lepičovský, Jan
Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry.
Sensors. Roč. 21, č. 23 (2021), č. článku 8158. E-ISSN 1424-8220
R&D Projects: GA MŠMT(CZ) LTAUSA19036
Institutional support: RVO:61388998
Keywords : high-speed * interferometry * supersonic * compressible flow * wind tunnel
OECD category: Applied mechanics
Impact factor: 3.847, year: 2021
Method of publishing: Open access
https://www.mdpi.com/1424-8220/21/23/8158/htm

This paper presents a very effective interference technique for the sensing and researching of compressible fluid flow in a wind tunnel facility. The developed technique is very sensitive and accurate, yet easy to use under conditions typical for aerodynamic labs, and will be used for the nonintrusive investigation of flutter in blade cascades. The interferometer employs a high-speed camera, fiber optics, and available “of-the-shelf” optics and optomechanics. The construction of the interferometer together with the fiber optics ensures the high compactness and portability of the system. Moreover, single-shot quantitative data processing based on introducing a spatial carrier frequency and Fourier analysis allows for almost real-time quantitative processing. As a validation case, the interferometric system was successfully applied in the research of supersonic compressible fluid discharge from a narrow channel in a wind tunnel. Density distributions were quantitatively analyzed with the spatial resolution of about 50 μm. The results of the measurement revealed important features of the flow pattern. Moreover, the measurement results were compared with Computational Fluid Dynamics (CFD) simulations with a good agreement.
Permanent Link: http://hdl.handle.net/11104/0327047