LNG低温波纹软管流动及传热特性数值模拟  

Numerical simulation of flow and heat transfer characteristics of LNG cryogenic corrugated hoses

作　　者：杨泰鸿 刘军鹏[1] 武昌旭 YANG Taihong;LIU Junpeng;WU Changxu(College of Safety and Ocean Engineering,China University of Petroleum(Beijing);Faculty of Civil and Environmental Engineering,University of Alberta)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院 [2]阿尔伯塔大学土木与环境工程学院

出　　处：《油气储运》2023年第12期1410-1418,共9页Oil & Gas Storage and Transportation

基　　金：国家自然科学基金面上项目“考虑残余应力的柔性立管复合抗拉铠装线强度失效机制”,52171286。

摘　　要：LNG波纹软管具有较好的柔性力学特性及柔顺性,但受其轮廓结构及传热系数较大的影响,会导致LNG运输过程中产生较大的热损,降低输送效率。为此,采用数值模拟方法,分别对LNG在光管和5种不同结构参数的波纹软管进行的输送流动和传热特性进行分析,探究波纹高度、波纹间距、雷诺数等对管道传热特性的影响规律,并采用综合热力性能指标(Performance Evaluation Criteria,PEC)对管道传热特性进行表征。结果表明:波纹软管比光管具有更高的努塞尔数和摩阻系数,具有更好的传热特性;波纹软管内努塞尔数随雷诺数的增大而增大,摩阻系数随雷诺数的增大而减小,并在高雷诺数下逐步稳定;相同雷诺数下,波纹软管努塞尔数随波纹高度的增大而增大,随波纹间距的增大而减小,同时摩阻系数与波纹高度、波纹间距的变化成正比,其中波纹高度的影响最大。研究成果可为LNG低温波纹软管的工程应用及其结构优化设计提供理论指导。LNG corrugated hoses have better flexible mechanical properties and compliance.However,due to the influence of its outline structure and the large heat transfer coefficient,large heat loss is caused during LNG transportation,with the transportation efficiency reduced.Therefore,the flow and heat transfer characteristics of LNG in the plain tube and the corrugated hoses with 5 types of different structural parameters were analyzed with the numerical simulation method.Meanwhile,the influence laws of the corrugation depth,corrugation pitch and Reynolds number on the heat transfer characteristics of the hoses were explored,and the heat transfer characteristics of the hoses were characterized with the thermal performance evaluation criterion(PEC).The results show that:The corrugated hoses have higher Nusselt number,greater friction coeficient and better heat transfer characteristics than the plain tubes.The Nusselt number in the corrugated hoses increases with the increase of Reynolds number,while the friction coefficient decreases with the increase of Reynolds number and becomes stable at high Reynolds number.Under the same Reynolds number,the Nusselt number of the corrugated hoses increases with the increase of the corrugation depth,but decreases with the increase of the corrugation pitch.Besides,the friction coeficient is proportional to the change of the corrugation depth and pitch,and the corrugation depth has the greatest influence.Generally,the research results could provide theoretical guidance for the engineering application and the structural optimization design of LNG cryogenic corrugated hoses.(13 Figures,3 Tables,23 References)

关 键 词：LNG 低温波纹软管 光管 传热性能 流动特性 数值模拟 

分 类 号：TE832[石油与天然气工程—油气储运工程]