Operational Experience and Test Results in the Adaptive Test Section of the DLR Transonic Tunnel
Holst, H. and Bock, K.-W. and Lorenz-Meyer, W. and Oberdieck, F. and Hermes, M. (1997) Operational Experience and Test Results in the Adaptive Test Section of the DLR Transonic Tunnel. The Aeronautical Journal, Vol. 101 (No. 1009), pp. 421-428.
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The transonic facility of DLR Göttingen (TWG) has been modernised with respect to an improved flow quality and flow simulation, as well as to the logistics of exchangeable test sections, operational reliability and productivity. It is presently equipped with a Laval nozzle for supersonic flow measurements, a perforated test section (6% open, 60 degree slanted holes) for transonic measurements, and a two-dimensional adaptive test section for subsonic measurements. The latter can perform two-dimensinal adaptive tests on wing profiles, using the Cauchy integral formula for wall adaptation, as well as two-dimensional wall adaptation for three-dimensional models, utilising the Wedemeyer/Lamarche procedure, also known as the VKI method. For both cases, it is shown that the wall adaptation was successful. The 3D force results compare quite well to test results from the perforated test section, as well as to nominally interference-free results. The pressure distribution from the wing profile tests compare quite well to theoretical calculations. In the course of windtunnel modernisation, the transonic facility of DLR Goettingen has been equipped with the new software system DeAsfor data acquisition and control of experimental facilities. In this environment the wall adaptation programs had to be implemented. Before adjusting the computed wall shape, it has to be controlled in the loop for sufficient accuracy and tolerable bending stresses. A simplified finite element method - also taking into account the pressure loads at the wall - is used for this purpose. The simplified approach has been checked against more detailed computations using ANSYS and NASTRAN.
|Title:||Operational Experience and Test Results in the Adaptive Test Section of the DLR Transonic Tunnel|
|Journal or Publication Title:||The Aeronautical Journal|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 421-428|
|Keywords:||modernization of transonic facility, survey of flexible wall bending stress, wall adaptation for 3D models, automation of tunnel operation and data acquisition.|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L SI - Versuchs- und Simulationstechniken|
|DLR - Research theme (Project):||UNSPECIFIED|
|Location:||Köln-Porz , Braunschweig , Göttingen|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Theoretische Strömungsmechanik|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||03 Apr 2006|
|Last Modified:||27 Apr 2009 10:36|
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