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Crossflow investigation with Temperature-Sensitive Paint in low-speed wind tunnels

Lemarechal, Jonathan (2017) Crossflow investigation with Temperature-Sensitive Paint in low-speed wind tunnels. Seminar: City, University of London, 09. Sep. 2017, London, Großbritanien.

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Official URL: https://www.city.ac.uk/

Abstract

The Temperature-Sensitive Paint (TSP) method is a thermographic measurement technique and mainly used to do flow visualizations, but also quantitative temperature, heat transfer and skin friction measurements are possible. To perform flow visualizations in low speed facilities the contrast needs to be enhanced by generating a heat flux between model and fluid. This way the measurement relies on the spatial variation of the heat transfer coefficient, which depends on the local skin friction coefficient (Reynolds analogy). Therefore, the department of Experimental Methods at DLR Göttingen develops a combination of Temperature-Sensitive Paints and electrical-heating methods for the application in lowspeed and high-speed wind tunnels (ambient and cryogenic Temperatures) and water facilities. The application of the TSP method in two different wind tunnel campaigns investigating crossflow instability is shown. One model is a natural laminar flow (NLF) wing and the other is the "Redesigned swept flat-plate experiment for crossflow-induced transition studies", which was in its flrst setup designed by H. Bippes and coworkers. In both measurements the TSP technique was successfully used to visualize the footprint of the stationary crossflow vortices and the laminar-turbulent transition. Further data analysis exceeding the pure flow visualization is discussed.

Item URL in elib:https://elib.dlr.de/118648/
Document Type:Conference or Workshop Item (Speech)
Title:Crossflow investigation with Temperature-Sensitive Paint in low-speed wind tunnels
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lemarechal, JonathanJonathan.Lemarechal (at) dlr.deUNSPECIFIED
Date:2017
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Crossflow, TSP, laminar turbulent transition
Event Title:Seminar: City, University of London
Event Location:London, Großbritanien
Event Type:Other
Event Dates:09. Sep. 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Bachmann, Barbara
Deposited On:01 Feb 2018 15:45
Last Modified:01 Feb 2018 15:45

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