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为了深入认识高负荷单级跨声速轴流压气机的失稳过程,揭示其不稳定流动现象的发生、发展及其诱导压气机失稳的物理本质,针对某单级跨声速轴流压气机开展试验研究,对整个失稳过程进行了稳态和动态试验测量.通过对原始信号进行低通滤波和FFT(fast Fourier transform)分析,结果表明:在失稳过程中,静子叶根区域首先出现大幅值、轴对称的轴向低频扰动,此时,该压气机50%叶高以下的加功能力有所下降,但整机并未完全失稳.由于该扰动具有频率低、轴对称、幅值大等典型特征,因此,将这一现象定义为局部喘振.随着流量进一步降低,该扰动会沿轴向和径向传播,最终发展到全叶高,此后,该扰动在转子叶尖区域诱发出旋转失速团,最终导致压气机完全失稳.
In order to understand deeply the instability process of single-stage transonic axial-flow compressor under high load and to reveal its occurrence and development of unstable flow phenomena and the physical essence of inducing the instability of compressor, a single-stage transonic axial-flow compressor is developed The steady-state and dynamic experimental measurements of the entire instability process are carried out.The results of low-pass filtering and fast Fourier transform (FFT) analysis of the original signal show that in the instability process, Value, axial symmetry of the axial low-frequency disturbance, this time, the compressor 50% leaf height below the Canadian power has declined, but the machine is not completely destabilized due to the disturbance with low frequency, axisymmetric, amplitude Therefore, this phenomenon is defined as local surging. As the flow rate decreases further, the disturbance propagates along the axial and radial directions and finally reaches the full leaf height. Afterwards, the disturbance is localized in the rotor tip region Induced spin stall group, eventually leading to complete failure of the compressor.