关键词: 振动与波, 离心压缩机, 失速, 频谱, 检测

Abstract: The mechanism of rotation stall of compressors produced by a factory in Longyan of Fujian province is analyzed. It is found that the air flow impacts the working surface of the blade when the wind flow reduces, while many air vortexes occur in the back surface of the blade. Thus, the net sectional area of the air flow decreases. The air bubbles induced by the vortexes translate in the sense opposite to the rotation of the impeller and cause the vibration. Summing up the type and characteristics of the rotation stall of the compressor, a method for monitoring the rotation stall signal is put forward based on Fast Fourier Transform. With this method, the omen of rotation stall can be found. With spectrum analysis, some improvement measures are proposed. This method has been proved simple, convenient and practical in recent oneyear application.

Key words: vibration and wave, centrifugal compressor, stall, spectrum, monitoring