辐射防护2024，Vol.44Issue(z1)：18-23,6.
基于准可逆方法的封闭空间放射性气溶胶溯源研究
Study on traceability of radioactive aerosols in closed spaces based on quasi reversible method
张明昊 1吴荣俊 2陈艳 2倪木一 1蒋应伍 1王雨晴1
作者信息
- 1. 中山大学中法核工程与技术学院,广东珠海 519082
- 2. 中国船舶重工集团公司第七一九研究所,武汉 430064
- 折叠
摘要
Abstract
After a radioactive leakage occurs in nuclear facilities,it is generally difficult to directly observe the release point of the source term.The location information of the source term could be obtained indirectly by using radiation monitoring data in the field and the inversion calculation of the diffusion model.Based on the quasi-reversible method,considering the aerosol particle gravity and Brownian diffusion,a direct inversion model for radioactive source terms in a closed space was carried out in this work.The k-epsilon turbulence equation and the convection-diffusion equation of particle pollutant diffusion were established by considering the typical aerosol dynamics parameters and combining the particle Eddy diffusion rate in the turbulent flow field.Then,by forcibly inverting the time step and replacing the second-order diffusion term with the fourth-order stable term,the numerical format of the equation is stabilized.Furthermore,a multi-sensor mode is adopted to reduce the impact of measurement errors,resulting in the inversion of quasi-reversible equations for multiple nominal sources.Finally,taking the"c-T"information of the sensor position as input,an appropriate stability coefficient for inversion was selected.The results show that this inversion model can accurately trace the location of the source term of particle pollutants in the convective diffusion environment within a closed space.关键词
泄漏事故/污染源识别/准可逆方法Key words
leakage accidents/identification of pollution sources/quasi-reversible method分类
能源科技引用本文复制引用
张明昊,吴荣俊,陈艳,倪木一,蒋应伍,王雨晴..基于准可逆方法的封闭空间放射性气溶胶溯源研究[J].辐射防护,2024,44(z1):18-23,6.
