An Axisymmetric Converging and Expanding Nozzle with Single Action System

Abstract

The invention provides an axisymmetric shrinking and expanding nozzle of a single-actuation system, which is mainly composed of a cylinder (1), an actuating cylinder (2), a pull rod (4), a convergence adjustment plate (5), and an expansion adjustment plate (6 ), the first bracket (7), the outer cover (8), the expansion sealing plate (9), the thin-walled swirl center body (10), the second bracket (11) and the convergence sealing plate (12). Among them, the cylinder body (1) is used as the supporting member of the entire nozzle; the actuator (2), the pull rod (4) and the convergence adjustment plate (5) are used as the throat area adjustment mechanism, and at the same time drive the expansion adjustment plate (6) to move, The outlet area can be changed according to a fixed rule; the thin-wall swirl center body (10) is used for shielding the front-end component. The invention has the advantages that the adjustment of the throat area and the outlet area is realized through a set of actuating system, and the nozzle has good stealth ability without affecting the adjustment range of the throat area, and has a simple structure and high reliability.

Description

technical field [0001] The invention belongs to the field of aero-engine nozzles, relates to an axisymmetric contraction-expanding nozzle of a single-action system, and is also applicable to the field of engine nozzles in need. Background technique [0002] Due to the internal hollow structure of the traditional aero-engine axisymmetric retractable nozzle, it cannot effectively shield the front-end hot-end components, resulting in very weak stealth ability. At the same time, the outlet area of ​​the traditional axisymmetric retractable nozzle is adjusted individually or by air pressure balance. The axially symmetrical retractable nozzle whose outlet area is individually adjusted needs to add an independent actuation system, resulting in increased weight and control rules. Complicated, but the outlet area of ​​the axisymmetric shrinking and expanding nozzle adjusted by the air pressure balance is greatly affected by the aerodynamic load and is basically uncontrollable. The t...

AI Technical Summary

Problems solved by technology

[0002] Due to the internal hollow structure of the traditional aero-engine axisymmetric retractable nozzle, it cannot effectively shield the front-end hot-end components, resulting in very weak stealth ability

At the same time, the outlet area of ​​the traditional axisymmetric retractable nozzle is adjusted individually or by air pressure balance. The axially symmetrical retractable nozzle whose outlet area is individually adjusted needs to add an independent actuation system, resulting in increased weight and control rules. Complicated, but the outlet area of ​​the axisymmetric shrinking and expanding nozzle adjusted by the air pressure balance is greatly affected by the aerodynamic load and is basically uncontrollable

The traditional plug-type axisymmetric retractable nozzle only adds a closed center body in the center of the nozzle, but due to the large cross-sectional area of ​​the closed center body, it seriously affects the adjustment range of the throat area of ​​the nozzle, which affects the engine. working point

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