Abstract
In this paper, the pressure pulsation of Wanjiazhai Francis turbine at six monitoring points under different loads is monitored. Fast Fourier Transform(FFT) was used to perform time-frequency conversion, and the data was analyzed from both time-domain and frequency-domain perspectives. From a time perspective, the pressure pulsation at the upstream bladeless area is the most sensitive to changes in power. From a frequency perspective, the frequency components of pressure pulsation are more complex when P=40kW, while the frequency domain diagrams of pressure pulsation at each monitoring point are similar when P=80kW and P=120kW.
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