A study on the stratification behavior of hydrogen gas induced by condensation on the wall surface of the containment compartment
In order to evaluate the effect of steam condensation near the cold wall of the containment compartment on the risk of hydrogen accumulation,numerical simulation was carried out to analyze the migration and accumulation of hydrogen-containing mixtures in the local compartment.The results show that under the condition of sufficiently high hydrogen and steam concentration,steam condensation will induce the formation of buoyant flow of mixed gas in the near-wall region.When the Fr of gas released in the compartment is less than the critical value,high concentration hydrogen gas will gather at the top of the compartment under the driving force of buoyancy flow near the wall.On the contrary,the hydrogen gas in the compartment will be mixed evenly.When the required component concentration conditions for buoyancy flow induced by condensation are met,condensation will enhance the stability of high concentration hydrogen gas accumulation in local compartments of the containment.The critical Fr required for hydrogen stratification in the compartments is significantly higher than that under the condition of no condensation.The conclusion of this paper can provide theoretical reference for hydrogen safety behavior under serious accidents in nuclear power plants.
containment compartmentsteam condensationhydrogengas stratificationhydrogen gas migrationhydrogen gas aggregationmulti-component gasesnumerical simulation
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维普
