| The inner fluid state of hydro-turbine is essential to the efficiency, steady operation and life span of the whole hydro-turbine. Although the hydraulic design can be made great, but in reality the operation is beyond from the design conditions because of the factors, such as fabrication technology, operation situation or some uncertain factors. So it is important to get the information of inner fluid state of hydro-turbineWhen the hydro-turbine is running, it's hard to gain the information, such as velocity, pressure, etc. which brings much inconvenience to the monitor. What gets the most attention is the ones that can bring danger for the turbine (such as Karman vortex, cavitation), which make different noise. So detecting and analyzing the noises is a good way to make analysis to the turbine.The paper aims to analyze the different noises by FFT (Fast Fourier transform), wavelet transformation and Wavelet Packet Transform. By analyzing the experimental data of No.17, No.16, NO.21, NO.26 from the Three Gorges. Spectral decomposition and sound level calculation of draft tube gate and turbine chamber were carried out for NO.17.Analysis of turbine chamber and scroll casing was carried to make a study to Karman vortex. The paper made a ultrasonic contrast of draft tube and turbine chamber in different situations: on-air-supply and air-supply. After the jobs above were finished, the results such as noise spectrum, sound level intensity can be a foundation to monitor the situation in which the turbine is.
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