摘要
失真空事故下灰尘的迁移影响聚变装置的安全运行。对灰尘迁移的研究及其影响因素的分析,将有助于消除或缓解灰尘带来的事故风险。本文采用计算流体动力学方法,在已验证有效的聚变灰尘实验装置(STARDUST)数值模型的基础上,建立了灰尘迁移模型,再现了失真空事故下气体流动状态及灰尘迁移特性;通过改变灰尘物性、破口位置及障碍物的存在,进行了灰尘迁移的影响因素分析。结果表明:灰尘物性会影响其在失真空事故下的分布,当颗粒的粒径越小,密度越小时,灰尘的分布越接近气体的速度场;不同破口位置条件下,灰尘在真空室内的分布是不同的;障碍物的存在会极大地限制灰尘的迁移。
During a loss of vacuum accident(LOVA),dust migration is related to the safe operation of fusion devices.The study of dust migration and its influencing factors helps to eliminate or alleviate the risk of accidents caused by dust.The computational fluid dynamics(CFD)was used to simulate the dust migration during LOVA.Based on the STARDUST numerical model which has proved to be valid,the dust migration model was built and the gas flow state and the dust migration characteristics during LOVA were reproduced.Through changing the physical properties of dust,break positions and the existence of obstacles,the influence factors were studied.It is found that the distribution of dust in the vacuum vessel(VV)is more similar to the velocity field of gas when the diameter and density is smaller.The simulation results also show that during LOVA,the dust distributions in VV are different when the break positions vary and the existing of obstacles can limit the migration of dust obviously.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2014年第S1期369-375,共7页
Atomic Energy Science and Technology
基金
国家磁约束核聚变能发展研究专项资助(2013GB114005
2014GB122000)
