The parameters of the compressor’s discharge static pressure and rotor speed were used to establish the surge detection method based on the first-order and the second-order rate of change. According to dozens of surge detection verifications in core-engine and whole-engine tests

when the threshold was exceeded

the stall or surge could be detected by the first-order change rate of compressor discharge static pressure

and then the possibility of occurrence was confirmed by the second-order change rate and the follow-up exceeding value of the first-order change rate of static pressure or speed. Those tests proved that this method had short response time

and the detection time was less than half of the surge period. The successful detection rate was as high as 100%

and the false alarm rate was as low as 0. and. With this method

no false or missed detection had been found.