基于压气机出口静压变化率的喘振检测方法

Surge detection method based on rate of change of compressor discharge static pressure

采用机载测量的压气机出口静压和转子转速等参数,建立了基于一阶和二阶变化率的喘振检测方法。经核心机和整机数十次喘振试验验证,结果表明:当超出所定义的判喘阈值时,压气机出口静压一阶变化率检测到发生失速或喘振,二阶变化率和再次出现的静压或转速一阶变化率超限对发生可能性进行确认。试验证明,该方法响应时间短,检测时间低于半个喘振周期。实时检测率达到100%,虚警率低至0,尚未发现误检和漏检。

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.