Patent ID: 7484589
Filing Date: 2009-02-03
Classification: B64F,G10K

Abstract:
1. A platform for an aerospace vehicle for reducing unsteady pressure fluctuations of high velocity exhaust mass flow exiting from an aerospace vehicle to reduce fatigue, the platform comprising: a passive treatment area positioned adjacent said platform, passive treatment area operable for reducing the unsteady pressure fluctuations generated by the high velocity exhaust mass flow exiting from an exhaust nozzle of said aerospace vehicle and impinging on a surface of said platform and reflecting therefrom in order to reduce the fatigue of the platform, said passive treatment area comprising at least one roughness element for disrupting high velocity structures of said exhaust flow to attenuate said unsteady pressure fluctuations, said passive treatment area further operable to attenuate reflective sound waves, wherein said at least one roughness element comprises at least one of a plurality of elements of varying sizes, elements of irregular shapes, and elements of both varying sizes and irregular shapes.