An active stability control method based on aero-engine stability margin estimation is proposed

Abstract

The invention discloses an active stability control method based on an aero-engine stability margin estimation. The method comprises the following steps: (1) an aero-engine surge real-time model; (2)surge margin estimation algorithm and simulation; (3) Active stability control law of aeroengine. As to that problem of aerodynamic stability of an aero engine, By utilizing the residual stability margin to improve the aerodynamic stability of the engine, The real-time model of engine surge and the estimation model of engine stability margin are established. The active stability control law is designed by robust control method, and the closed-loop control loop of engine stability margin is constructed, which ensures that the dynamic performance brought by the residual stability margin can be brought into full play under the condition of stable operation of the engine in transient state. In addition, this scheme can make the engine work at the high performance point with small surge marginduring acceleration, improve the acceleration performance of the engine and enhance the maneuverability of the aircraft.

Description

Technical field [0001] The invention relates to an active stability control method based on aeroengine stability margin estimation, which belongs to the technical field of aeroengine control. Background technique [0002] The five typical technical characteristics of the fourth-generation fighter are: stealth, supersonic cruise, high maneuverability, integrated avionics and autonomous logistics. The realization of these superior characteristics is inseparable from the use of S-shaped intake ports and high thrust-to-weight ratio engines and the use of post-stall maneuvers. At the same time, it also makes the adverse effect of intake distortion on the stability of the compressor more and more serious. Stability puts forward higher requirements. Engines are facing the challenge of comprehensive optimization of high pressure ratio, high efficiency, high stability and high anti-distortion ability. The contradiction between engine performance and stability is becoming more and more pr...

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Problems solved by technology

The passive control strategy with the instability control line, short-term stability augmentation control system and instability recovery system as the core has been developed relatively maturely, and has been widely used in the power plant of the third-generation fighter jets, which ensures that the engine and However, the conservative stability margin of the instability control line, the open-loop nature of the short-term stability augmentation control system, and the post-event nature of the instability recovery control system make the traditional instability control strategy have many fatal flaws. It is reflected in the following aspects: (1) The existence of the instability control line prevents the performance of the engine from being fully utilized. Under the same performance requirements, an engine with higher performance has to be selected, which will lead to a substantial increase in the weight of the engine , the thrust-to-weight ratio is greatly reduced; (2) the instability control line narrows the working range of the engine, so that the remaining surge margin cannot be effectively used, thereby reducing the operability of the engine and the maneuverability of the aircraft; (3) the short The stability augmentation control system is open-loop control, which means that no matter whether the engine is really in danger of instability, the pilot will force it to start. This conservative control measure will undoubtedly reduce the performance of the engine; (4) Instability recovery control system When starting, the engine is already in a state of aerodynamic instability. If it enters a "non-recoverable stall", the instability recovery control system will not be able to function, and it will have to stop in the air and restart. Stability will also accelerate the aging of the engine and shorten the service life of the engine

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