低温流量计标定平台冷箱内管道热应力分析  

Thermal stress analysis of pipelines in cryogenic flowmeter calibration platform

作　　者：李欢 李俊杰[2] 章凯 李晓明 Li Huan;Li Junjie;Zhang Kai;Li Xiaoming(Institute of Machinery and Electrical Engineering,Anhui Jianzhu University,Hefei 230601,China;High Magnetic Field Laboratory,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]安徽建筑大学机械与电气工程学院,合肥230601 [2]中国科学院合肥物质科学研究院强磁场科学中心,合肥230031

出　　处：《低温工程》2023年第4期55-62,共8页Cryogenics

基　　金：中国科学院战略性先导科技专项课题资助(XDC10010400);中国科学院合肥研究院院长基金资助(No.YZJJ2021QN29)。

摘　　要：针对冷箱内管道在低温状态下受到的压力、重力以及因降温收缩而产生的应力,根据有限元理论,考虑静压和温度的热固耦合作用,建立以稳态热传导为基础的低温管道热应力模型。对其进行网格无关性验证,并以低温管道的整体结构为研究对象进行数值模拟,得到不同管道在施加温度载荷前后的应力应变情况以及管道在预冷时应力变化规律。结果表明,低温下管道的最大等效应力为135.74 MPa,最大位移量为3.42 mm,管道在预冷过程中最大等效应力为127.3 MPa,满足管道结构的设计要求。With regard to the pressure,equipment gravity and stress caused by thermal con-traction of the pipelines in the cold box at low temperature,the couple effect of static pressure and temperature was first considered.Then,the thermal stress analysis model for cryogenic pipeline was developed based on steady state heat conduction,the grid-independent verification was carried out,and the numerical simulation of the overall structure of the cryogenic pipeline was conducted numerical simulation.The influence of temperature on stress-strain of different pipelines and the stress variation rule of pipelines during precooling process were obtained.The results show that the maximum equivalent stress of pipeline at low temperature is 135.74 MPa and the maximum displacement is 3.42 mm.The maximum equivalent stress of the pipeline in the precooling process is 127.3 MPa,which meets the design requirements of pipeline structure.

关 键 词：冷箱 低温管道 数值模拟 热应力 稳态热传导 

分 类 号：TB663[一般工业技术—制冷工程]