严重事故下气溶胶再悬浮的ECART模型分析

Analysis of Aerosol Resuspension under Severe Accident by ECART Model

利用中国原子能科学研究院开发的CABSA程序气溶胶再悬浮模块中的ECART模型,对STORM项目的SR11试验进行计算,分析了核电厂严重事故下的气溶胶再悬浮特性。结果表明:气溶胶所受各种力均随直径的增大而增大,其中使气溶胶悬浮的拖曳力和爆发力比使气溶胶附着在结构表面的黏着力和重力增长更快;直径大的气溶胶悬浮率更大;结构表面流体速度能够影响拖曳力和爆发力,速度增大会提高拖曳力和爆发力,最终导致悬浮率增加。利用该特点,可通过降低结构表面流速降低拖曳力和爆发力,从而减小悬浮率,最终减小裂变产物向空间的重新释放。

Utilizing ECART model in resuspension module of CABSA code developed by China Institute of Atomic Energy,the SR11 test in STORM project was calculated and the features of aerosol resuspension under severe accident of nuclear power plant were analyzed.The result shows that all the forces on aerosol increase with aerosol diameter,drag force and burst force increase faster than adhesive force and gravity force.Aerosol with larger diameter has greater resuspension rate.Fluid velocity above structure can affect drag force and burst force,the increment of velocity can enlarge both the forces,and make the resuspension rate increase.By taking this advantage,the drag force and burst force can be reduced by reducing the fluid velocity above structure,and finally decrease the release of fission product to the environment.