Method for judging stall during aero-engine starting

Abstract

The invention discloses a method for judging stall during aero-engine starting. The method includes the steps of firstly, drawing corrected speed and corrected pressure graphs; secondly, determining initial speed and unit speed, and performing linear regression fitting; thirdly, performing weighted averaging on compressor discharge pressure of the initial speed and each speed point during normal starting and stall starting, and generating the judging threshold of a compressor discharge pressure change slope; fourthly, judging whether compressor discharge pressure change slope of the speed is smaller than the judging threshold or not, and if so, determining that engine stall occurs; if not, determining that engine stall does not occur. The method has the advantages that the method is designed according to the other feature, namely compressor discharge pressure lowering, of engine starting stall, and theoretically the stall can be distinguished once the stall occurs.

Description

technical field [0001] The invention relates to the technical field of aero-engines, in particular to a method for judging the stalling of an aero-engine in the starting process. Background technique [0002] During engine starting, stalling is a typical problem that leads to engine starting failure. When a stall occurs, the outlet pressure of the compressor decreases, and the exhaust temperature of the engine rises rapidly, resulting in a failure to start. When early engines were controlled by mechanical hydraulic systems, they did not have the conditions to use complex algorithms to detect and control them. After the engine adopts a digital control system, the calculation and control of complex algorithms can be realized, but the difficulty is what method or model is used to detect the engine stall phenomenon. [0003] At present, in the digital control system, aiming at the rapid rise of exhaust gas temperature during the stall process, a ratio of temperature change to ...

AI Technical Summary

Problems solved by technology

But its shortcomings are also obvious, mainly in the starting process. When the auxiliary power is working, this method cannot detect the shallow stall of the engine, which may easily lead to the failure of the engine to start. The sensitivity of this method is relatively poor.

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