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本文讨论如何用数字统计函数定量地研究转子速度尾迹,建立转子基元级工作状况与尾迹的关系,通过功谱图可以定量地分析出干扰源的频率及其强度;从相关图上可以得到τ=0时的相关值R_x(0),即尾迹的总功率,它包括叶片通过频率和全部非稳定工作引起的噪音与损失。叶片通过频率幅值最大、尾迹总功率最小的状态是压气机最佳工作状态,各基元级非稳定工作状态的发生和发展反映在尾迹总功率变化规律上,可以用它确定最先发生失速的基元。由转子尾迹特征参数和紊流度可以求出旋转叶栅损失,为修改设计提供参考依据。
This paper discusses how to quantitatively study the rotor wake with the help of the statistical function of the numbers and establish the relationship between the working condition of the rotor and the wake. The frequency spectrum and the intensity of the interference source can be quantitatively analyzed through the spectrogram. From the correlation diagram, τ = 0, the correlation value R_x (0), ie the total power of the wake, includes the noise and loss caused by the blade passing frequency and all unsteady work. The maximum blade passing frequency and the minimum total power of the wake are the best working condition of the compressor. The occurrence and development of each unstable working state at the elementary level is reflected in the law of the total power of the wake. It can be used to determine the first occurrence of stalling The basic element. Rotor cascade loss can be obtained from rotor wake characteristic parameters and turbulence degree, which can provide reference for modification of design.