A novel divertless thrust vectoring nozzle using the countercirculation aerodynamic effect: Maximal Aerodynamic Yaw Actuator-MAYA

• Main Author: Valeriu DRĂGAN
• Format: Article
• Language: English
• Published: National Institute for Aerospace Research “Elie Carafoli” - INCAS 2011-03-01
• Series: INCAS Bulletin
• Subjects: thrust vectoring; Coanda effect; super -circulation; counter circulation
• Online Access: http://bulletin.incas.ro/files/valeriu_dragan_v3is1_full.pdf

During the second half of the 20th century, Henri Coanda had extensively studied theCoanda effect and also it’s application for high lift devices that use –in one way or another- supercirculation. A previous work has been done for using the Coanda effect to generate perpendicularforces to the aircraft trajectory– including aircraft specifically designed to attain short take off suchas the An-72 and YC-14.Dwelling on the same principles, the author had tried to imagine and test a 2D thrust vectoring deviceusing differentiated super circulation on two flat surfaces placed near the jet exhaust. The success ofthis endeavor has been limited because the forces produced were not as great as anticipated.However, the numerical simulations indicated the presence of another, opposite effect, more powerfuland potentially more useful than the first: the counter circulation.This paper describes the working principles of a two dimensional thrust vectoring nozzle aimingsatisfy the need for a conventional rudder to control yaw and also shows the prospect of upgrading itto a 3D thrust vectoring nozzle.