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

Sep

05

Tuesday

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

3.00pm

Seminars

Staff, Students, Academics

Speaker: Jonathan Lemarechal, Department of Experimental Methods, Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Goettingen, Germany

Research Centre: Aerodynamics and Flow Control Group

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

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 low-speed 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 first 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.

Speaker’s BIO

Mr. Jonathan Lemarechal received his Diploma in mechanical engineering specialized in aerospace engineering from Technical University of Braunschweig in 2012. During his studies he stayed at the University La Sapienza, Rome, in the group of Professor G.P. Romano for research work. Following the Diploma was a short stay as research scientist in the Institute of Fluid Mechanics of Professor Radespiel in Braunschweig. He is working for the German Aerospace Center (DLR) since 2014 in the PSP/TSP group of the Department of Experimental Methods. Currently he is doing his PhD with Professor Rist of the University of Stuttgart in the field of application of Temperature-Sensitive Paint in low speed water facilities and transition delay of Tollmien-Schlichting induced transition.

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When & where

3.00pm - 4.00pmTuesday 5th September 2017

AG05 College Building City, University of London St John Street London EC1V 4PB United Kingdom