SUPERSONIC UNREGULATED AIR INTAKE Russian patent published in 2022 - IPC F02C7/04 B64D33/02 

FIELD: aeronautical engineering.

SUBSTANCE: invention relates to aeronautical engineering, namely to air intakes for providing outboard air to systems and power plants of aircraft. The supersonic unregulated air intake comprises an air intake housing with a shell located directly on the surface of the aircraft, and a throat, behind which at least one subsonic diffuser is located. The shell is made of edges that form an entrance, which is not rectangular in front view. The edges are swept and lie in a plane oriented at an acute angle to the surface of the aircraft; in subsonic and supersonic flight modes, the air flow rate is less than unity, which makes it possible to form a separation of the boundary layer in the supersonic mode with its bypass into the external flow in the vicinity of one of the two or both articulation points of the edge of the air intake shell and the surface of the aircraft with the formation of intersecting oblique and direct shock waves in front of the air intake entrance with the point of their intersection below the height of the air intake inlet in the front view.

EFFECT: invention ensures stable operation of the power plant up to M=2.0 with a total pressure recovery factor at the engine inlet not lower than typical for unregulated air intakes and a total flow heterogeneity below the maximum allowable value, as well as stable operation of the air intake with the required characteristics of scavenging air for aircraft systems up to M=3.0 and a decrease in the visibility of the aircraft in the radar range.

5 cl, 8 dwg