Abstract
In this study, monitoring method of cavitation generated at the downstream of the flow control valve was examined. On the occurrence of cavitation, piping vibration was measured at the low-frequency range of less than 1 kHz. The frequency components like white noise was measured when cavitation was generated. Therefore, it was found that cavitation could be monitored by measuring the frequency component like white noise. However, the generation location of cavitation couldn't be identified by measuring the frequency component like white noise, because the frequency components like white noise wasn't damped in the piping. To identify the generation location of cavitation in the piping system, the method by numerical analysis was examined. Pressure in the piping was calculated by the numerical analysis using the method of characteristics. The generation location of cavitation generation was examined by detecting the pressure which was lower than saturated vapor pressure of water. The results of the numerical analysis and the experiment agree. Therefore it was demonstrated that the generation location of cavitation could be identified by numerical analysis.
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