主催: The Japan Society of Mechanical Engineers
会議名: 第30回 原子力工学国際会議（ICONE30）
開催日: 2023/05/21 - 2023/05/26
If the water piping system under high temperature and pressure is damaged and water is ejected into the atmosphere, a jet with depressurization boiling (Flashing) occur. Human safety and safety equipment may be damaged by the impingement of the flashing jet. Therefore, it is necessary to evaluate the region affected by the flashing jet impinging on the surrounding equipment and people.
In this study, we investigated experimentally to confirm the validity of the region affected by the flashing jet with the saturated and subcooled water under the conditions of low pressure at the jet inlet up to 2 MPa, and further investigated under the conditions of high pressure up to 7 MPa, which are difficult in the experiment, using Computational Fluid Dynamics (CFD).
From the experimental results, as the subcooling temperature increased, the mass flux and spread angle of the flashing jet increased and the region affected by the flashing jet increased. The mass flux calculated by the Homogeneous Equilibrium Model tended to be in good agreement with the experimental results.
The asymptotic plane distance and the jet width of the flashing jet were well organized by the density ratio at the nozzle outlet. By using the correlations between the density ratio and the asymptotic plane distance and the jet width, it is possible to evaluate the impact region of the flashing jet, which includes conditions from subcooled water to saturated water.
