Summary
The temporal and spatial development of natural and controlled boundary layer in-stabilities was investigated in the linear and weakly nonlinear stage on a laminar wing glove in flight and in wind tunnel. Two-dimensional Tollmien-Schlichting (TS) waves dominate the boundary layer flow in the early linear stage of the natural transition, but wave packets with small oblique angles are already existent. In the higher amplification stages individual and spatially independent wave packets prevail. In the present study, controlled disturbances generating structures, which are similar to ‘natural’ disturbances, were investigated, too. These controlled experiments were conducted to achieve a better understanding of the characteristics and structures of flow transition and to compare the measurements with results of a direct numerical simulation (DNS). For the experiments surface hot-wire arrays and piezo sensor arrays were employed on the wing surface.
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References
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Peltzer, I., Nitsche, W. (2004). Experimental Investigations of Natural and Controlled Transition on a Laminar Flow Airfoil. In: Wagner, S., Kloker, M., Rist, U. (eds) Recent Results in Laminar-Turbulent Transition. Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM), vol 86. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45060-3_21
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DOI: https://doi.org/10.1007/978-3-540-45060-3_21
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-07345-8
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