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Towards Quantitative Wall Shear Stress Measurements: Calibration of Liquid Crystals

Melekidis, Stefanos; Elfner, Maximilian; Bauer, Hans-Jörg

Abstract (englisch):
The wall shear stress distribution on an aerodynamically loaded component is of both practical and fundamental importance. Significant examples are the improvement of the performance of a vehicle, e.g. drag reduction, and more basic problems, such as the characterization of surface flows, e.g. with respect to flow control. The liquid crystal technique represents a promising diagnostics for measuring wall shear stress magnitude and orientation. In contrast to most other techniques, the direct measurement of two-dimensional wall shear stress distributions is straightforward.

In order to establish quantitative measurements of wall shear stress using the liquid crystal technique, an in-depth understanding of the influencing parameters is required. For their investigation, a novel generic flat plate test section was designed. The experiments are performed in such a way that a turbulent boundary layer is triggered at a corresponding Reynolds number within the test section. Due to the generic test case, precise and well-known flow boundary conditions can be established, which in turn are validated by probe measurements. Velocity and temperature profiles are recorded with high spatial resolution using a miniaturized combined Pitot-thermocouple probe. ... mehr

DOI: 10.1115/GT2020-14381
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2021
Sprache Englisch
Identifikator ISBN: 978-0-7918-8414-0
KITopen-ID: 1000128321
Erschienen in Proceedings of ASME Turbo Expo 2020 : Turbomachinery Technical Conference and Exposition
Veranstaltung ASME Turbo Expo: Turbomachinery Technical Conference and Exposition (2020), Online, 21.09.2020 – 25.09.2020
Verlag American Society of Mechanical Engineers (ASME)
Seiten GT2020-14381
Vorab online veröffentlicht am 11.01.2021
Externe Relationen Abstract/Volltext
Schlagwörter liquid crystals, wall shear stress, skin friction, quantitative calibration, aerodynamics, optical measurement technique
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