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Full-scale qualitative measurements of airflow paths to assess the thermal performance of a long-range twin-aisle aircraft section in the flight test facility

: Norrefeldt, Victor; Grün, Gunnar

Estorff, O. von (Hrsg.) ; TU Hamburg-Harburg; Institut National des Sciences Appliquées -INSA-, Toulouse:
4th International Workshop on Aircraft System Technologies. Proceedings : April 23 - 24, 2013, Hamburg, Germany
Aachen: Shaker, 2013 (Berichte aus der Luft- und Raumfahrttechnik)
ISBN: 978-3-8440-1850-9
International Workshop on Aircraft System Technologies (AST) <4, 2013, Hamburg>
Conference Paper
Fraunhofer IBP ()

Knowing airflows between compartments in aircrafts is important to understand its overall thermal behaviour. When constructing a thermal model of an aircraft, the modeller might rely on the design airflow path and maybe enlarge it by some admitted side flow paths. In the presented study a tracer gas technique is shown that qualitatively reveals the actual airflow paths regardless what the designer would have thought. Experiments are performed on a full scale long-range twin aisle aircraft mock up placed in the Fraunhofer Flight Test Facility. With the tracer gas technique, it could be proven that there is a noticeable airflow path connecting crown, cockpit and bilge whereas the design airflow path that connects triangle areas with the bilge only plays a minor role.