A. Mignosi, D. Arnal, S. Prudhomme, J. Reneaux

The use of cryogenic wind tunnels to study laminar flows constitutes a new challenge and can lead to a great progress in the area of aerodynamic testing. In this field ONERA has gained experience with the T2 transonic wind tunnel and also from theoretical analyses based on the linear stability theory. In addition to standard problems associated with laminar flows, specific difficulties occur in a cryogenic test. A first one, analysed from a theoretical point of view, is to know if the cold gas can be considered as a perfect gas for the transition phenomenon. A second problem is to properly qualify the fluctuations of the speed, pressure and temperature existing in a cryogenic test section which depend on the test conditions. These measurements are connected to a theoretical approach to define the physical parameters and the frequencies acting on the transition phenomenon. Non adiabatic wall and ice particules can also be problems and modify or trip the transition on the model surface . After a brief presentation of the T2 wind tunnel and of the theoretical method used to analyse experiments, different results dealing with laminar flows in a cryogenic wind tunnel will be presented.

First European Forum on Laminar Flow Technology, Hamburg, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 10 Seiten

DGLR-Bericht, 1992, 1992-06, First European Forum on Laminar Flow Technology; S.100-109; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aerodynamics, laminar flow, wind tunnel, cryogenic wind tunnels

Bestellbar

1992