液氢温区下单温区双管道绝热支撑的热-结构耦合研究分析

Thermal structural coupling analysis of double pipe heat insulation support in single temperature zone of liquid hydrogen

以液氢温区下的单温区低温双管道为研究对象,对其进行了热流分析,建立了数学模型及几何模型,采用有限元方法进行了热-结构耦合分析求解,分析了不同壁厚下漏热、应力及形变的变化规律,和不同隔热孔径下的漏热、应力及形变的变化规律。研究结果表明:壁厚减小,漏热值减少,绝热支撑总体应力增加,支撑形变增大;相同壁厚下,隔热孔孔径增大,漏热值减小,支撑应力减小,形变增大。最终,针对某工程使用的单温区双低温管道,拟合出了壁厚与各个参数量的曲线、方程及漏热值与最大应力的函数方程式,得出最薄壁厚可取为0.638 mm。针对隔热孔孔径的优化,拟合出了孔径与漏热及最大形变的曲线、函数,确定了支撑的最优孔径为82.9 mm。

The heat flow of single temperature zone cryo double pipeline in liquid hydrogen temperature zone was analyzed,the mathematical model and geometric model were established,the thermal structural coupling analysis was solved by finite element method,and the variation laws of heat leakage,stress and deformation under different wall thickness and different diameter of insulation hole were analyzed. The results show that the wall thickness decreases,the heat leakage value decreases,the overall stress of the heat insulation support increases and the support deformation increases. Under the same wall thickness,the thermal insulation hole diameter increases,the heat leakage value decreases,the support stress decreases and the deformation increases. Finally,for the single temperature zone and double cryo pipeline used in a project,the curves and equations of wall thickness and various parameters,as well as the functional equations of heat leakage value and maximum stress were fitted,and it was concluded that the most thin wall thickness can be0. 638 mm. For the optimization of the diameter of the insulation hole,the curves and functions of the diameter,heat leakage and maximum deformation were fitted,and the optimal diameter of the support was determined to be 82. 9 mm.