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首页> 外文会议>National Fluid Mechanics and Fluid Power Conference >CHARACTERIZATION OF PRESSURIZED AIR LEAKAGE AND AEROSOL TRANSPORT THROUGH CRACKS IN CONCRETE
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CHARACTERIZATION OF PRESSURIZED AIR LEAKAGE AND AEROSOL TRANSPORT THROUGH CRACKS IN CONCRETE

机译：通过混凝土裂缝对加压空气泄漏和气溶胶运输的特征

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摘要

Cracks may appear in the pressurized concrete containment of a nuclear power plant during a severe accident and provide leak paths for release of radioactive aerosols dispersed in the contained air. In this study, numerical results for air leakage and aerosol transport through concrete cracks are reported for a range of pressure gradients, crack widths and aerosol particle sizes relevant to containment atmosphere during a severe accident scenario. Crack geometry is generated using statistical crack models to account for crack tortuousness. Airflow field generated in air leakage studies is used for aerosol transport studies with the Lagrangian discrete phase model using CFD code FLUENT. The models used for the study have been validated against experimental results reported in literature. It has been shown that the statistical crack model is suitable for aerosol deposition rate calculations. The pressure gradient across the crack influences the particle deposition rate significantly for low values but at high values very little change is observed in the particle deposition rate.
机译：裂缝可能严重事故中出现在核电站的加压混凝土外壳和分散在空气中所含放射性气溶胶释放提供泄漏通道。在这项研究中，空气泄漏，并通过混凝土裂缝气溶胶输送数值结果报告为一系列的压力梯度，裂缝宽度和气溶胶粒子严重事故场景期间尺寸相关的壳气氛。裂缝几何使用统计裂纹模型来考虑裂缝tortuousness产生。在空气中的泄漏研究中产生的气流场被用于与使用CFD代码FLUENT拉格朗日离散相模型气溶胶输送的研究。用于研究的模型已被证实对文献报道的实验结果。已经显示的是，统计裂纹模型适合于气溶胶沉积率的计算。横跨裂缝的压力梯度显著影响粒子的沉积速率为低的值，但在高的值非常小的变化是在颗粒沉积速率观察到的。

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