Numerical simulation study of fuel leakage and combustion inside containment triggered by aircraft impact
This study is to investigate the effect of combustion on the containment of nuclear power plants after aircraft impact.A physical model consistent with the actual containment dimensions was established.The fuel leakage aperture and aircraft impact height were determined through a large number of investigations.Fluent was used to simulate the combustion process of aviation kerosene alternative fuel inside and outside the containment.The flame temperature changes at different positions of the containment were analyzed.The results show that at the beginning,the fuel leakage time is relatively short.The fuel slowly vaporizes,and the combustion process is dominated by diffusion.The high-temperature area is mainly distributed on the side wall and bottom of the containment.With the passage of time,the evaporation rate of the liquid level increases.The flame height presents a longitudinal development trend and finally forms a relatively uniform temperature field at the top.The maximum combustion temperature inside the containment can reach 2 229 K.When the fuel burns outside the containment,the temperature at the wall is much lower than the temperature during internal combustion.The maximum external combustion temperature is 1 308 K.In addition,the higher the impact height is,the earlier the high-temperature area will appear on the top of the containment.At the lower position,due to the slow accumulation of liquid pool,the fuel evaporation rate is low,and the temperature rise is relatively slow.At the impact height of 23 m,the peak temperature is almost at a high level.Therefore,fuel combustion is the most dangerous under this working condition.With the further increase of the impact height,the peak temperature at the top and bottom of the containment shows a downward trend.For combustion outside containment,the top of containment is always in a safe state.
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维普
