Analysis of Destruction Laws of Double-Wall Encapsulated Insulation Configuration under LBLOCA Condition
-
摘要: 受冷却剂丧失事故(LOCA)喷放流体冲击产生的保温纤维碎片是安全壳地坑滤网堵塞的潜在碎片源。本文以空气为介质模拟大破口失水事故(LBLOCA)下介质喷放压力场及物理过程,通过高速摄影视频回放及碎片统计,分析双壁盒式保温结构受高能流体冲击时的破坏规律。实验结果表明,内壁为双壁盒式保温模块最薄弱部分;高能流体冲击下,模块连接机构失效使得模块与管道分离,内壁暴露于高速气流中被撕裂引起保温碎片释放。基于保温结构破坏机理分析,提出采用不锈钢捆扎带可有效减小碎片量,并通过实验对改进方案进行了验证。
-
关键词:
- 双壁盒式保温结构 /
- 破坏特性 /
- 大破口失水事故(LBLOCA) /
- 喷嘴冲击实验 /
- 不锈钢捆扎带
Abstract: The insulation fiber debris,deduced from the LOCA fluid blasting,is a potential debris source blocking the sump strainer in the containment.The present work simulates the physical process and pressure field of LBLOCA by using of high-pressure air,moreover,destruction law of double-wall encapsulated insulation configuration is analyzed by replaying high speed video and accounting debris.The result indicates that the inner wall is the weakest part for double-wall encapsulated insulation.The modules separated from the pipe due to failure of connection mechanism subjected to high speed air impacting,and the insulation material fragments were released mainly through tearing the inner wall.The stainless-steel bands were proposed to reduce the debris by analyzing the failure mechanism of the insulation configuration.Finally,the insulation improvement method was verified by experiments. -
计量
- 文章访问数: 12
- HTML全文浏览量: 4
- PDF下载量: 0
- 被引次数: 0
下载:
