Gas turbine engine fan duct base pressure drag reduction.

摘要

An aircraft is provided with an aircraft base pressure drag reduction means having a means for ducting air on board an aircraft wherein the air produces ram air drag, a means for using the air for work, and a means for ducting the used air to a low pressure area of an aircraft which otherwise produces base pressure drag on the aircraft. In a more particular embodiment of the invention the low pressure area of the aircraft is in a fan duct of an aircraft gas turbine engine. In the preferred embodiment the low pressure area in a fan duct of an aircraft gas turbine engine is on the pylon fairing and the means for using the air for work includes at least one means for bleeding boundary layer air from the surface of the aircraft for reducing aircraft boundary layer induced drag. <IMAGE>