逼喘试验中的喘振及失速现象分析
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摘要
以某型发动机逼喘试验中的脉动压力为研究对象,运用短时傅立叶变换的信号处理方法将高采样率的数据转化到时频域,呈现某型发动机在试飞过程中发生气动不稳定现象时的瀑布图,分析压气机在发生喘振和失速时脉动压力出现的不同的现象,得出对压气机气动不稳定性有指示作用的脉动压力频率,在飞行中,监测这些频率处的脉动压力波动情况,对于压气机气动稳定性的实时判断是非常有意义的。
In this paper, the pulsating pressure in the test of a type of engine flight platform is studied. Short-time Fourier transform(STFT) signal processing method is used to transform high-sampling data into time-frequency domain. The waterfall diagram shows the aerodynamic instability of a certain type of engine during the test flight. The different phenomena of pulsating pressure during surge and stall of the compressor are analyzed, thus the pulsating pressure frequency which can indicate the aerodynamic instability of compressor is obtained. In the flight process, monitoring pulsating pressure fluctuations at these frequencies is very meaningful to judge the aerodynamic stability of compressor in real time.
In this paper, the pulsating pressure in the test of a type of engine flight platform is studied. Short-time Fourier transform(STFT) signal processing method is used to transform high-sampling data into time-frequency domain. The waterfall diagram shows the aerodynamic instability of a certain type of engine during the test flight. The different phenomena of pulsating pressure during surge and stall of the compressor are analyzed, thus the pulsating pressure frequency which can indicate the aerodynamic instability of compressor is obtained. In the flight process, monitoring pulsating pressure fluctuations at these frequencies is very meaningful to judge the aerodynamic stability of compressor in real time.
引文
[1] 刘大响,叶培梁.航空燃气涡轮发动机稳定性设计与评定技术[M].北京:航空工业出版社,2008.
[2] R.C.Pampreen.压气机喘振与失速[M].北京:中国航空工业总公司发动机系统工程局,1999.
[3] 贾滨京,孙永向,于起峰.脉动压力环境成因及其定性特征[J].岳阳师范学院学报,2003,16(1):1-5.
[4] 李振兴.细化FFT的短时傅立叶变换方法[J].四川兵工学报,2010,31(2):133-135.
[5] 马燕荣,王小峰,马明明.发动机空中插板逼喘试验研究[J].实验流体力学,2010,24(5):92-96.
[6] 路俏俏,胡军.风机旋转失速的故障诊断与处理[J].冶金设备管理与维修,2005(1):37-39.
[2] R.C.Pampreen.压气机喘振与失速[M].北京:中国航空工业总公司发动机系统工程局,1999.
[3] 贾滨京,孙永向,于起峰.脉动压力环境成因及其定性特征[J].岳阳师范学院学报,2003,16(1):1-5.
[4] 李振兴.细化FFT的短时傅立叶变换方法[J].四川兵工学报,2010,31(2):133-135.
[5] 马燕荣,王小峰,马明明.发动机空中插板逼喘试验研究[J].实验流体力学,2010,24(5):92-96.
[6] 路俏俏,胡军.风机旋转失速的故障诊断与处理[J].冶金设备管理与维修,2005(1):37-39.