Abstract
In this paper, the water hammer effect of nuclear power plant (NPP) pipeline caused by pump switch and valve closure was investigated using numerical simulation. A piecewise formula was defined to approximately describing the process of pump opening. Different from the existing research, this paper emphatically focuses on the influence of the air cavity at the margin of pipeline on the pressure fluctuation. To observe the interaction of water and air phases, the volume of fluid (VoF) method was utilized here. The results conveyed that the amplitude and frequency of pressure are significantly dominated by the air cavity volume. A smaller air cavity volume corresponds to a lower maximum pressure, which is beneficial to the security of the pipeline. And with the reduction of air cavity volume, the pressure wave dissipates faster. This study suggests that the effective exhaust should be executed in advance before the operation of pump and valve.
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