Abstract
Liquid droplet impingement erosion (LDI) is defined as an erosion phenomenon caused by high-speed droplet attack in a steam flow. In a power plant, pipe wall thinning by LDI is observed steam piping system. Because LDI usually occur very locally and is difficult to detect, a prediction of LDI location is required for the safety of the plant system. Because LDI is almost dominated by fluid factor like droplet velocity and diameter, there is a possibility to predict the location of wall thinning by LDI if local flow condition is clarified. Though the local flow condition can be obtained by calculation, droplet diameter is difficult to calculate So, in this study, we conducted steam experiment to measure the droplet diameter by PDPA, and tried to clarify the characteristics of the droplet and the correlation between droplet diameter and state quantities of the flow. We found that a distribution of the droplet diameter could be approximated by gamma distribution that is a general form of an exponential distribution. For the correlation between the diameter and the state quantities, we considered the change of the heat energy in addition to a surface tention and a shear force, and checked the correlation between the quantity and droplet diameter. As a result, we observed good correlation between them and suggested approximate equation.
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