A geared rear ducted ejector for afterburner

Abstract

The invention provides a gear-driven rear ducted ejector for an afterburner, comprising: a crank, the crank includes a crankshaft and a cylindrical gear fixed at one end of the crankshaft; the crankshaft penetrates through the On the outer casing of the afterburner; a rotating plate, the rotating plate is an annular structure, sleeved on the outer ring of the head of the afterburning chamber, and the annular end surface on one side of the rotating plate is provided with a surface gear, the face gear and the cylindrical gear of the crank are mutually meshed; the driving device, the driving device is arranged on the outer wall of the outer casing, and the driving end is connected with the crankshaft, so as to drive the crank to rotate around the central axis and drive the rotating plate in the circumferential direction rotate. The invention adopts the drive source externally placed on the outer casing, the gear transmission structure and the flexible support structure, and has the advantages of low flow resistance, compact structure space, few moving pairs, reliable centering, insensitivity to the radial error of the shaft, etc. Comprehensive requirements such as the structural characteristics of the external casing.

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...

AI Technical Summary

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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