Receptivity of the inclined-cylinder attachment-line boundary layer to vortex perturbations
The receptivity of the boundary layer in the neighborhood of the attachment line of a cylinder inclined to the flow with respect to periodic vortex perturbations frozen into the stream is investigated. The problem considered simulates the interaction between external turbulence and the leading-edge swept wing boundary layer. It is shown that if the direction of the external perturbation vector is almost parallel to the leading edge, then the external perturbations are considerably strengthened at the outer boundary layer edge. This effect can cause laminar-turbulent transition on the attachment line at subcritical Reynolds numbers.
Keywordslaminar-turbulent transition turbulence receptivity boundary layer swept wing
Unable to display preview. Download preview PDF.
- 1.D. I. A. Poll, “Transition in the infinite swept attachment line boundary layer,” Aeronaut. Quart., 30, 607 (1979).Google Scholar
- 3.D. I. A. Poll and D. J. Poisley, “On the effect of wing taper and sweep direction on the leading edge transition,” Aeronaut. J., 89, No. 883, 109 (1985).Google Scholar
- 5.A. V. Kazakov, “Influence of the surface temperature on the boundary layer stability on the attachment line of a swept wing,” Izv. Akad. Nauk SSSR, Mekh. Zhidk. Gaza, No. 6, 78 (1990).Google Scholar
- 6.F. P. Bertolotti, “On the connection between cross-flow vortices and attachment-line instabilities,” IUTAM Symp. on Laminar-Turbulent Transition, Sedona, USA, 1999, Springer, Berlin etc. (1999), pp. 625–630.Google Scholar
- 9.M. V. Ustinov, “Receptivity of the swept wing boundary layer to a steady flow inhomogeneity,” Izv. Ros. Akad. Nauk, Mekh. Zhidk. Gaza, No. 3, 111 (2001).Google Scholar