Effect of surface suction on crossflow instability and transition occuring near a swept attachment-line

The work contained in this report is concerned with the use of transpiration at the leading edge of swept wings to modify and control transition due to cross-flow instability. Transition conditions are identified on both porous and non-porous surfaces, with and without suction, and the effect of two-dimensional excrescences is considered. Throughout, the application of the results to vehicle design is stressed and, where possible, simple design criteria are presented.