CNG储气瓶物理爆炸裂纹动态扩展特性  

Dynamic crack propagation characteristics of CNG tanks during physical explosion

作　　者：李丽锋 罗金恒 张超[3] 杜洋[2] 吉楠 LI Lifeng;LUO Jinheng;ZHANG Chao;DU Yang;JI Nan(CNPC Tubular Goods Research Institute//State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials;College of Mechanical and Electrical Engineering,China University of Petroleum(East China);No.1 Gas Production Plant,PetroChina Changqing Oilfield Company)

机构地区：[1]中国石油集团工程材料研究院有限公司·石油管材及装备材料服役行为与结构安全国家重点实验室 [2]中国石油大学(华东)机电工程学院 [3]中国石油长庆油田分公司第一采气厂

出　　处：《油气储运》2022年第10期1181-1188,共8页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金资助项目“基于率型损伤演化与流固耦合的内爆炸下管道裂纹动态扩展机理与预测研究”,51805544;中国石油天然气集团有限公司科学研究与技术开发项目“储气库注采转换过程安全评估技术研究”,kt2020-16-06。

摘　　要：CNG储气瓶面临潜在的物理爆炸风险,为研究其物理爆炸时裂纹动态扩展特性,基于热黏塑性本构模型、J-C失效准则及罚函数接触算法,构建了CNG储气瓶物理爆炸裂纹动态扩展流固耦合数值分析模型,研究了储气瓶裂纹扩展特征和内部高压天然气泄放规律。结果表明:储气瓶物理爆炸时裂纹倾向于沿轴向扩展,速度高达200~300 m/s,且呈现渐进式扩展的特征,但并无某一主导频率;高压天然气快速泄放产生的反作用力会导致储气瓶发生轴向弯曲变形;裂纹扩展结束时储气瓶两端仍具有较高内压,储气瓶裂纹扩展能量仅由部分气体压缩能提供。研究结果对储气瓶物理爆炸事故分析与反演具有积极意义。CNG tanks have the potential risk of physical explosion.In order to study the dynamic crack propagation characteristics of CNG tanks during physical explosion,a numerical analysis model of fluid-solid coupling was established based on the thermo-viscoplastic constitutive model,J-C failure criterion and penalty method contact algorithm.In this way,the crack propagation characteristics of CNG tanks and the release rules of high-pressure natural gas were analyzed.The results show that the tank cracks tend to propagate along the axial direction under physical explosion at a speed up to 200 m/s to 300 m/s,and the crack propagation is incremental without any dominant frequency.Besides,the reaction force generated by the rapid release of high-pressure natural gas can lead to the axial bending deformation of tanks.Moreover,the two ends of tanks are still under high internal pressure when crack propagation ends,and the energy of crack propagation is only provided by partial compressed natural gas.Generally,the research results have positive significance to the analysis and inversion of the physical explosion accident of CNG tanks.

关 键 词：CNG储气瓶 物理爆炸 裂纹扩展 流固耦合 

分 类 号：TE88[石油与天然气工程—油气储运工程]