基于数字式控制系统的涡扇发动机起动过程失速检测方法

Stall Detection Method of Turbofan Engine Starting Process Based on Digital Control System

针对涡扇发动机起动过程出现失速的问题,对典型失速现象进行分析,提出了1种基于数字式控制系统的涡扇发动机起动过程失速检测方法。通过对比压气机失速和整机起动过程失速之间的特征差异,识别出失速检测的判据,建立起动过程失速检测的基础算法模型,并依据相似原理对模型进行修正,提高了算法的适应性。以某型发动机为平台对该检测方法进行仿真和试验验证,结果表明:该方法可有效检测出发动机起动过程的失速,尤其是在辅助动力工作时,失速检测的灵敏性、适用性和准确性明显提高。

Aiming at the problem of the turbofan engine stall starting,the typical stall phenomenon was analyzed.A stall detection method based on digital control system was presented for turbofan engine starting process.The criterion of stall detection was identified by comparing the characteristic difference between the compressor stall and the engine starting process stall.The basic algorithm model of stall detection during starting process was established,and the model was modified according to the principle of similarity,which improved the adaptability of the algorithm.The detection method was simulated and tested on the platform of a certain engine.The results show that the method can effectively detect the engine starting stall,especially in auxiliary power operation,the sensitivity,applicability and accuracy of stall detection are obviously improved.