池式鼓泡条件下气溶胶沉降效率研究

放射性气溶胶是核反应堆严重事故中最重要的产物之一，来源于固体裂变产物外漏和气体裂变产物的凝聚成核。池式鼓泡水洗是去除放射性气溶胶的有效途径，准确掌握其过滤效率，对于事故后源项控制和事故分析评价都具有重要意义。本文针对池式鼓泡条件下的气溶胶沉降特性展开深入的基础研究，借助先进的粒径谱分析技术，研究液相淹没深度、气相表观流速等参数对亚微米级气溶胶沉降效率的影响，探究气溶胶在上升气泡群内的沉降机理。本项目的研究成果可用于气溶胶沉降效率模型验证。

Research on Aerosol Deposition Efficiency under Bubbly Scrubbing Condition

Radioactive aerosols as one of the most important products in serious nuclear reactor accidents are generated from leakage of solid fission products and condensation of gaseous fission products. Bubbly scrubbing is an effective way to deposite radioactive aerosols. It is of great significance for post-accident source term control and accident analysis and evaluation to accurately grasp its filtration efficiency. In this paper, an in-depth basic research was carried out on the aerosol deposition characteristics in rising bubbles. With the help of advanced particle size spectrum analysis technology, the influence of parameters such as liquid submersion depth and apparent gas phase velocity on the deposition efficiency of submicron aerosols was studied to explore the deposition mechanism of aerosols in rising bubbles. The research results of this project can be used to verify the aerosol deposition efficiency model, so as to improve the uncertainty of the analysis results of source term concentration under severe accident conditions.