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Experimental Investigations on a Suction Airfoil for Sailplanes

Quast, A. and Rohardt, C.-H. (1996) Experimental Investigations on a Suction Airfoil for Sailplanes. In: Proc. Second Laminar Flow Forum, 10.-12.6.1996 in Bordeaux..

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Abstract

It is known from ELFIN-experiments that in conjunction with suction some strange phenomena occur, mainly the rise of wedges of undefined origin. One approach to cover these problems is to exclude possible causes step by step. The present step dealt only with Tollmien-Schlichting instability. The main result was that boundary layer behaved quite normal, no wedges were observed. Full laminar flow to the trailing edge was present only on the lower side and at lower Reynolds-numbers. Experiment and calculation are compared, apparently calculated suction is too low, but even with higher suction only extended laminar flow is obtained but not full. This leads to the assumption that laminar flow behind suction remains somewhat "contaminated" withTollmien-Schlichting waves.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1996, pages=17,
Title:Experimental Investigations on a Suction Airfoil for Sailplanes
Authors:
AuthorsInstitution or Email of Authors
Quast, A.UNSPECIFIED
Rohardt, C.-H.UNSPECIFIED
Date:1996
Journal or Publication Title:Proc. Second Laminar Flow Forum, 10.-12.6.1996 in Bordeaux.
Status:Published
Keywords:Suction, Tollmien-Schlichting-Instability, Section-Airfoil
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):L - Concepts & Integration
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:06

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