This paper obtains a review of modern experimental techniques to improve free air simulations in transonic wind tunnels by use of adaptive wall technology. The review considers the significant advantages of adaptive wall testing techniques with respect to wall interferences. Reynolds number, tunnel drive power, and flow quality. The application of these testing techniques relies on making the test section boundaries adjustable and using a rapid wall adjustment procedure. An historical overview shows how the disjointed development of these testing techniques, since 1938, is closely linked to a available computer support. An overview of Adaptive Wall Test Section (AWTS) designs shows a preference for use of relatively simple designs with solid adaptive walls in 2- and 3-D testing. Operational aspects of AWTSs are discussed with regard to production type operation where adaptive wall adjustments need to be quick. Both 2- and 3-D data are presented to illustrate the quality of AWTS data over the transonic speed range. Adaptive wall technology is available for general use in 2-D testing, even in cryogenic wind tunnels. In 3-D testing, more refinement of the adaptive wall testing techniques is required before more widespread use can be envisaged.
Adaptive wall technology for minimiztion of wall interferences in transonic wind tunnels
Adaptive Wandtechnik zur Minimierung der Wandstöreinflüsse im Transsonikwindkanal
1989
27 Seiten, 22 Bilder, 1 Tabelle, 24 Quellen
Conference paper
English
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