Abstract
Roughness induced transition in the leading edge region of airfoils is one of the challenges in the design of highly efficient wind turbine blades especially with respect to various inflow turbulence levels. The present experimental investigation discusses, therefore, the interaction of a laminar boundary layer perturbed by a single, 2D disturbance mode with a cylindrical roughness element at medium height. High and low speed streaks in the roughness wake suggest the presence of a counter-rotating vortex pair. A significantly increased amplification of the disturbance mode downstream of the roughness in comparison to the zero roughness height case leads to the formation of 3D structures with a dominant spanwise length scale corresponding to the roughness diameter. However, these 3D structures are only very weakly distinctive far downstream.
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References
Acarlar, M., Smith, C.: A study of hairpin vortices in a laminar boundary-layer. Part 1. J. Fluid Mech. 175, 1–41 (1987)
Aizin, L., Polyakov, N.: Acoustic generation of Tollmien-Schlichting waves over local unevenness of surfaces immersed in streams. Preprint 17, Akad. Siberian Div, Nauk USSR (1979)
De Paula, I., Würz, W. et al.: Generation of seeds of subharmonic resonance in an airfoil boundary-layer transition initiated by modulated TS-waves. 15th ICMAR, Novosibirsk (2010)
De Paula, I., Würz, W., Medeiros, M.: Experimental study of Tollmien-Schlichting wave interaction with a shallow 3D roughness element. J. Turb. 9, 1–23 (2008)
Ergin, F., White, E.: Unsteady and transitional flows behind roughness elements. AIAA J. 44(11), 2504–2514 (2006)
Goldstein, M.: Scattering of sound waves into Tollmien-Schlichting waves by small streamwise variations in surface geometry. J. Fluid Mech. 154, 509–529 (1985)
Klebanoff, P., Cleveland, W., Tidstrom, K.: On the evolution of a turbulent boundary-layer induced by a three-dimensional roughness element. JFM 237, 101–187 (1992)
Klebanoff, P., Tidstrom, K.: Mechanism by which a two-dimensional roughness element induces boundary-layer transition. Phys. Fluids 15(17), 1173–1188 (1972)
Lachmann, G. (ed.): Boundary layer and flow control. 637–656 and 657–681. Pergamon Press (1961)
Legendre, R., Werle, H.: Toward the elucidation of three-dimensional separation. Ann. Rev. Fluid Mech. 33, 129–154 (2001)
Plogmann, B., Würz, W., Krämer, E.: Interaction of a laminar boundary layer with a cylindrical roughness element near an airfoil leading edge. AIAA 2012–3077 (2012)
Plogmann, B., Würz, W., Krämer, E.: Interaction of a three-dimensional roughness element with a TS-wave near an airfoil leading edge. 16th ICMAR, Kazan (2012)
Saric, W., Hoos, J., Radezsky, R.: Boundary layer receptivity of sound with roughness. Boundary Layer Stability and Transition to Turbulence. (1991)
Wang, Y.: Instability and transition of boundary layer flows disturbed by steps and bumps. Ph.D. thesis, Queen Mary College, University of London (2004)
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Plogmann, B., Würz, W., Krämer, E. (2014). Interaction of a Cylindrical Roughness Element and a Two-Dimensional TS-Wave. In: Dillmann, A., Heller, G., Krämer, E., Kreplin, HP., Nitsche, W., Rist, U. (eds) New Results in Numerical and Experimental Fluid Mechanics IX. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 124. Springer, Cham. https://doi.org/10.1007/978-3-319-03158-3_17
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DOI: https://doi.org/10.1007/978-3-319-03158-3_17
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