Abstract
The temporal and spatial development of natural Tollmien-Schlichting (TS) instabilities and artificially generated disturbances was investigated comprehensively in-flight as well as in a wind tunnel. The experiments were performed on a laminar wing glove for a sailplane using different surface sensor arrays (surface hot-wire sensors, piezo-sensor arrays). Two-dimensional TS waves dominate in the early linear stage of the boundary layer flow, but single three-dimensionally (3D) dominated wave packets, observed in the late stage of TS development, can be measured in the early stage as well. Furthermore, in the in-flight measurements, the 3D-instabilities occur earlier than in the wind tunnel. For the experiments on controlled transition, an array of spanwise distributed harmonic point sources which induced mono and multifrequency disturbances was used in order to compare the development of natural and controlled instabilities.
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REFERENCES
Nitsche, W., Suttan, J., Becker, S., Erb, P., Kloker, M., and Stemmer, C. (2001). Experimental and Numerical Investigations of Controlled Transition in Low-Speed Free Flight. Aerosp. Sci. Technol., 5:245-255.
Peltzer, I. (2004). Flug-und Windkanalexperimente zur räumlichen Entwicklung von Tollmien-Schlichting-Instabilitäten in einer Flögelgrenzschicht. Mensch und Buch Verlag, Berlin. Dissertation an der Technischen Universität Berlin.
Peltzer, I. and Nitsche, W. (2003). Experimental Investigations of Natural and Controlled Transition on a Laminar Flow Airfoil . In S. Wagner, M. Kloker, U. Rist, editor, Recent Results in Laminar-Turbulent Transition -Selected Numerical and Experimental Contributions from the DFG-Schwerpunktprogramm “Transition” in Germany (NNFM 86), pages 269- 280. Springer Verlag.
Schröder, A. and Kompenhans, J. (2003). Investigation of Transitional Structures in Artificially Excited Boundary Layer Flows by Means of Stereo and Multi-plane PIV. In S. Wagner, M. Kloker, U. Rist, editor, Recent Results in Laminar-Turbulent Transition -Selected Numerical and Experimental Contributions from the DFG-Schwerpunktprogramm “Transition” in Germany (NNFM 86), pages 255-268. Springer Verlag.
Stemmer, C. and Kloker, M. (2002). Interference of Wave Trains with Varying Phase Relations in a Decelerated Two-Dimensional Boundary Layer. In S. Wagner, U. Rist, H.J. Heinemann, R. Hilbig, editor, New Results in Numerical and Experimental Fluid Mechanics III (NNFM 77), pages 239-246. Springer Verlag.
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Peltzer, I., Nitsche, W. (2006). IN-FLIGHT AND WIND TUNNEL MEASUREMENTS OF NATURAL AND OF CONTROLLED INSTABILITIES ON A LAMINAR FLOWAIRFOIL. In: Govindarajan, R. (eds) IUTAM Symposium on Laminar-Turbulent Transition. Fluid Mechanics and Its Applications, vol 78. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4159-4_35
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DOI: https://doi.org/10.1007/1-4020-4159-4_35
Publisher Name: Springer, Dordrecht
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