Gear transmission rear duct ejector for afterburner

Abstract

The invention provides a gear-driven rear duct ejector for an afterburner, which comprises a crank, an ejector rod and an ejector rod, and is characterized in that the crank comprises a crankshaft and a cylindrical gear fixed at one end of the crankshaft; the crankshaft is fixed on an outer culvert casing in the afterburner in a penetrating manner; the rotating plate is of an annular structure and is arranged on the outer ring of the head of the afterburner in a sleeving mode, a face gear is arranged on the annular end face of one side of the rotating plate, and the face gear is meshed with the cylindrical gear of the crank; the driving device is arranged on the outer wall of the outer culvert casing, and the driving end of the driving device is connected with the crankshaft so as to drive the crank to rotate around the center shaft and drive the rotating plate to rotate in the circumferential direction. A driving source is externally arranged on the outer culvert casing, and a gear transmission structure and a flexible supporting structure are adopted, so that the device has the advantages of being low in flow resistance, compact in structural space, few in kinematic pair, reliable in centering, insensitive to axial and radial errors and the like, and the comprehensive requirements of the structural characteristics of the double outer culvert casing and the like are met.

Description

technical field [0001] The invention relates to the technical field of aero-engines, in particular to a gear-driven rear ducted ejector used for an afterburner. Background technique [0002] According to the design concept of aero-engines, a turbojet cycle with high unit thrust is required for continuous high Mach number flight missions, and a turbofan cycle with low fuel consumption rate is required for low Mach number and long-range flight tasks. When both supersonic and subsonic flight are required, a variable-cycle engine that can take into account both is required. [0003] In order to take into account the needs of aero-engines with high unit thrust at supersonic speeds and low fuel consumption at subsonic speeds, variable-cycle engines came into being. The variable cycle engine is to change the thermodynamic cycle of the engine by changing the geometry, size or position of some parts of the engine. The focus of the research is to change the bypass ratio. The perform...

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Problems solved by technology

Among the engine components that require variable geometry involved in the above, the design of the rear duct ejector is difficult due to its high operating temperature, large axial and radial thermal expansion differences in the area, and structural limitations of the double outer casing. Larger, needs to be focused and studied

[0004] According to the characteristics of the rear duct ejector in the double-external channel variable cycle engine and the current research progress, the main design requirements of the rear duct ejector can be obtained: the blockage of the air flow channel is small to meet the need of reducing drag, and the adjustment mechanism is reduced The required space is to meet the limited space requirements, the number of drives is as small as possible to improve consistency, the friction pair is reduced and synchronization is improved to reduce the risk of motion jamming, and the reasonable structural layout matches the structural characteristics of the double-external casing, etc., but currently The existing technology can not fully meet the above-mentioned design requirements

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