粗糙度与破口尺寸对管道裂纹摩擦系数影响的计算研究  

Numerical Study of Effect With Roughness and Crack Opening Displacement on Friction Coefficient of Crack

作　　者：王迎[1] 李勇[1] 贺艳秋[1] 王运生[1] 罗峰[1] 

机构地区：[1]中国核动力研究设计院反应堆工程研究所,四川成都610041

出　　处：《装备制造技术》2016年第3期38-41,共4页Equipment Manufacturing Technology

摘　　要：在核电站管道破前漏设计(Leak Before Break,LBB)过程中,准确计算流过管道贯穿裂纹的流体泄漏量是最为核心的因素,是确保泄漏量监测系统成功运行,有效预防管道断裂事故发生的关键。如何准确计算裂纹通道的摩擦系数又是管道裂纹泄漏量计算中的核心问题之一。通过数值计算探讨了管道贯穿裂纹的全局粗糙度、局部粗糙度以及破口尺寸对裂纹通道摩擦系数的影响,研究结果表明:摩擦系数与全局粗糙度、局部粗糙度以及破口位移大小密切相关,破口位移δ与全局粗糙度μg的比值是判定摩擦系数计算中粗糙度取值的关键指标,当δ/μg<5.0,即应当考虑局部粗糙度对管道裂纹摩擦系数的影响。In the process of LBB on nuclear duct,accurate calculation for leak flow was important and was the most key for leak monitoring systems operating and preventing duct break.For leak flow calculation,the core was how to get friction coefficient of duct crack,and this paper investigated the effects of global roughness,local roughness and crack opening displacement on friction coefficient of crack with numerical study.The results prove that friction coefficient of crack was related to global roughness,local roughness and crack opening displacement,and the ratio of crack opening displacement（δ） and global roughness（μg）was key to choose value of roughness.When δ/μg〈5.0,the effect of local roughness on friction coefficient of crack should be considered.

关 键 词：贯穿裂纹 局部粗糙度 全局粗糙度 破口位移 摩擦系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]