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Powered high-lift systems generally use airflow from the engine to shape the flow of air over the wing, replacing or modifying the action of the flaps. Blown flaps take " bleed air " from the jet engine 's compressor or engine exhaust and blow it over the rear upper surface of the wing and flap, re-energising the boundary layer and allowing the ...
Ball-Bartoe Jetwing used for blown-wing research. Note the "augmentor", intended to direct the discharged airflow over the wingWilliams [8] states some flap blowing tests were done at the Royal Aircraft Establishment before the Second World War, and that extensive tests were done during the war in Germany including flight tests with Arado Ar 232, Dornier Do 24 and Messerschmitt Bf 109 aircraft.
A straight, or moderate sweep, wing may experience, depending on its airfoil section, a leading-edge stall and loss of lift, as a result of flow separation at the leading edge [4] and a non-lifting wake over the top of the wing. However, on a highly-swept wing leading-edge separation still occurs but instead creates a vortex sheet that rolls up ...
The propulsion system ... In November 2018 the first self-contained ion-propelled fixed-wing ... Ionic air propulsion is a technique for creating a flow of ...
The propulsive wing is a patented [1] UAV (unmanned aerial vehicle) design concept developed in the 2000s with extremely high lift and internal volume. The propulsive wing could be used to develop a new class of aircraft based on an embedded, distributed cross-flow fan propulsion system within a thick wing.
To increase ram-air recovery, nearly all jetliners use modulating vanes on the ram-air exhaust. A ram-air fan within the ram system provides ram-air flow across the heat exchangers when the aircraft is on the ground. Nearly all modern fixed-wing aircraft use a fan on a common shaft with the ACM, powered by the ACM turbine.
Vortilons only stream vortices at high angles of attack [8] and produce less drag at higher speeds than wing fences. [9] Pylons used to mount jet engines under the wing produce a similar effect. [10] The occurrence of span-wise flow at high angles of attack, such as observed on swept wings, is
The main problem with the circulation control wing is the need for high energy air to be blown over the wing's surface. Such air is often bled from the engine; however, this drastically reduces engine power production and consequently counteracts the purpose of the wing. Other options are taking the exhaust gases (which must first be cooled) or ...