Pressure pulsation test of Wanjiazhai Francis turbine at different loads

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.