Abstract
Pressure pulsation is an important factor affecting the stability of the turbine. The test studied the characteristics and laws of pressure fluctuations of giant hydraulic turbines to provide guidance for the design and stable operation of giant hydraulic turbines. The test used time-domain analysis and frequency-domain analysis methods to test and analyze the pressure pulsating real machine of giant hydraulic turbine. The test results show that the amplitude of pressure pulsation has a negative correlation with active power. The active power ranges from no-load to 40%P, and the pressure pulsation is mainly expressed as a high-frequency waveform with a frequency conversion of 8.8 to 24.4 times. The active power ranges from 40%P to 75%P, and the pressure pulsation mainly manifests as a low-frequency waveform with a frequency conversion of 0.19 to 0.28 times. Active power range from 75%P to 100%P, the amplitude of pressure pulsation decreases significantly. The above three load areas coincide with the vibration area of the unit, indicating that the hydraulic factor is the main factor affecting the stability of the unit.
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