摘要
熔融液滴的细粒化是决定燃料与冷却剂相互作用破坏后果的关键过程,它决定最终的热能与动能的转化比,是预测事故后果的重要因素之一。然而目前对该过程中基于本身内能的热细粒化机理尚不清楚。本工作通过单个熔融金属液滴与水相互作用的实验,借助高速摄像系统对熔融液滴的热细粒化现象进行拍摄,观察发现熔融金属液滴与水的相互作用经历了若干次加速膨胀细粒化过程,测量到熔融液滴的细粒化时间为0.8 ms,两次细粒化的时间间隔为0.8 ms,细粒化加速膨胀时间仅为0.4 ms。根据实验观察和分析,提出了一种由熔融液滴与水接触面不稳定沸腾效应引起的热细粒化机理。
The fragmentation of melt droplet is a key factor to predict the damage degree of fuel coolant interaction accident, which determines the final ratio of internal energy transferred to power. However, the fragmentation mechanism based on internal energy is not very clear currently. The interaction of single melt droplet with water was studied by experiment in the paper. Thermal fragmentation of melt droplet was observed with high-speed camera. Experiment results show that the interaction goes through several circles of expansion. The measured fragmentation time is about 0. 8 ms, the interval time of two fragmentations is 0.8 ms, and the accelerating expansion time is 0.4 ms. A new thermal fragmentation mechanism based on boiling effect was proposed.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2009年第7期604-608,共5页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(50576050)
NSFC-RFBR中俄合作基金资助项目(50711120190&06-08-39004-NSFC)
