Low-Speed Aerodynamics of the Upper-Surface Blown Jet Flap 740470

This paper summarizes the results of recent wind-tunnel investigations conducted to provide fundamental aerodynamic information on the upper-surface blown jet-flap concept incorporating high-bypass-ratio turbofan engines. The results of the investigations have shown the concept to have aerodynamic performance generally comparable to that of other externally blown high-lift systems. This paper will cover some of the more critical problem areas associated with this concept and will discuss solutions which have been found for these problems.


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