INVESTIGATION OF UPPER SURFACE BLOWING APPLIED TO HIGH SPEED AIRCRAFT

摘要

A preliminary evaluation of a transonic, propulsive, life augmentation system known as upper surface blowing (USB) has been completed. USB is a thick jet, jet flap powered lift concept which uses a trailing edge flap and the Coanda effect to vector the jet engine exhaust for lift augmentation. A wind tunnel test has demonstrated lift induction induction increments 1 1/2 to 3 times the thrust vectored component in the lift direction. An estimate of a USB fighter performance shows a possible 40 knot reduction in approach speed and a 10% reduction in trun radius for a maximum sustained 'g' turn at Mach 0.90 and 30,000 feet altitude.