Unformatted text preview: separation and its consequences. Fact: a boundary layer is less prone to separation when it is turbulent. Secondary flows caused by boundary layers: e.g. "the tea leaves problem" & secondary flow in bends. 8.6 Separation and drag. On blunt bodies, drag is mainly pressure drag, and decreases when the boundary layer turns turbulent. On very slender bodies, the drag is mainly viscous drag, and increases when the boundary layer turns turbulent. 8.7 Separation and lift: Why the lift-to-drag ratio increases when the boundary layer over an airfoil becomes turbulent. Why higher lift can be achieved with turbulent flow in the boundary layer. 8.8 Comments on boundary layer control (delay of separation). 8.9 Integral method for solving the (laminar) boundary layer equation. Examples. Reading: Fay, pp. 311-324; Kundu; Chapter 10 Handouts of data on drag and on lift. Problems: Shapiro & Sonin, 9.4, 9.5, 9.6, 9.11....
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This note was uploaded on 02/27/2012 for the course MECHANICAL 2.25 taught by Professor Garethmckinley during the Fall '05 term at MIT.
- Fall '05