A. Seraudi, J.B. Dor, J.P. Archambaud, A. Blanchard

Carrying out laminar flow experiments in a cryogenic wind tunnel presents some difficulties; we will describe different aspects of these problems with the figures of that poster. After a brief description of the T2 wind tunnel for cryogenic operations, and of the low inertia models used for laminar tests, this paper will develop the experimental point of view to perform laminar tests: (- moisture contamination (- active precautions to reduce undesired transition tripping (- determination of transition location (- operating envelope for T2 laminar tests. T2 is an induction driven transonic wind tunnel in which the Reynolds number variations are obtained by increasing the total pressure (Pt=l,4 to 3 bars), and reducing the total temperatu.re of the flow (Tt = 110 to 300 K) /1/, /2/. The use of cryogenic technology allows to reach high Reynolds numbers to reproduce the aerodynamic phenomena existing on aircraft in flight. Since 1983, many aerodynamic studies have been carried out for basic researches and industrial applications, mainly in laminar flow field. The T2 wind tunnel is equipped with an automatic control regulation of the run and acquisition system, performed by two mini computers. Since 1989, 3 D laser doppler anemometer has been working to provide more informations to analyse the transonic flows; at present this device is only used in ambient conditions.

First European Forum on Laminar Flow Technology, Hamburg, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 7 Seiten

DGLR-Bericht, 1992, 1992-06, First European Forum on Laminar Flow Technology; S.237-243; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aerodynamics, laminar flow, wind tunnel, cryogenic wind tunnels

Bestellbar

1992