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Experimental Investigation of Effects of Static Pressure and Steam Wetness on Acoustic Resonance Amplitude in a Closed Side Branch
Yuta Uchiyama, Ryo Morita

Last modified: 2018-04-11


Flow-induced acoustic resonances in piping with closed side branches are one of the phenomena causing severe structural vibration and fatigue damage of piping and components in many industrial applications such as power plants. Practical piping of power plants often have a steam flow, and moreover, the steam state can be not only dry steam but also wet steam. From our previous experiments, higher acoustical damping was confirmed under low-pressure wet steam than that under low-pressure dry steam, which is considered to be caused by the existing liquid phase in a wet steam. Moreover, the effects of the liquid phase on the pressure fluctuation was considered to be small at a high pressure since the maximum amplitude under wet steam increased with increasing the static pressure. In this paper, we investigated the combined effects of the static pressure and steam wetness on the pressure fluctuation. We conducted experiments on acoustic resonance in a single side branch under wet steam flow with the static pressure and steam wetness as parameters to extract and evaluate the dominant factors affecting the mechanism of acoustical damping under a wet steam flow.


Flow-induced acoustic resonance; Wet steam flow; Side branch

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