New-configuration large-bypass-ratio turbofan engine redundancy control method and device

Abstract

The invention provides a new-configuration large-bypass-ratio turbofan engine redundancy control method and device.The method comprises the step that an engine is controlled through a main control loop and a redundancy control loop which are parallel, and comprises the following steps that control variables of the engine are determined, and the control variables comprise the main control variable and the redundancy control variable; wherein the redundant control variable is the VAFN area; designing a main control loop according to the main control variable; designing a redundancy control loop according to the redundancy control variable, and setting activation logic for the redundancy control loop; the main control loop and the redundancy control loop are used for outputting control instructions to control the engine to work according to the formulated dispatch table. When the method is applied to a new-configuration turbofan engine, the key performance indexes of the fan and the engine can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of aero-engines, and in particular relates to a redundant control method and device for a turbofan engine with a new configuration and a large bypass ratio. Background technique [0002] The National Aeronautics and Space Administration (NASA) proposed the N+3 research plan in 2011, which provides a technology roadmap for the development of propulsion systems for subsonic fixed-wing aircraft from 2020 to 2035. In order to achieve the goals set by the N+3 plan, NASA also proposed its own N+3-level reference propulsion system, named AGTF30, which has the following characteristics: [0003] As for the fan, its supercharging ratio has dropped from the current 1.7 to 1.3, while the fan diameter will reach 2.54 meters, and the speed will be lower to improve efficiency, fuel economy and reduce noise; the fan and the low-pressure rotor pass through a gear with a reduction ratio of 3.1 box connection; bypass ratio will also b...

AI Technical Summary

Problems solved by technology

[0009] As a redundant control variable, VAFN will cause new problems in control after the introduction: since the controller adds a control variable, under the given throttle stick angle and flight state, N 1 Or EPR can be achieved by controlling both fuel flow and VAFN area, for N 1 Or EPR forms redundant control, which improves the control speed, quality and flexibility, but the existing control method can only realize the control of the main control variable, and cannot be well compatible with the control of redundant control variables

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