缠绕管内超临界甲烷流动换热特性研究  

Study on flow heat transfer characteristics of supercritical methane in a winding tube

作　　者：赵敏 杨雨青 栾林林 韩方玲 吴学红 吕财 Zhao Min;Yang Yuqing;Luan Linlin;Han Fangling;Wu Xuehong;Lv Cai(School of Energy and Power Engineering,Zhengzhou University of light industry,Zhengzhou 450000,Henan,China)

机构地区：[1]郑州轻工业大学能源与动力工程学院,郑州450000

出　　处：《低温与超导》2022年第5期58-64,共7页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51476149);河南省高等学校重点科研项目(20A470016);郑州市协同创新专项(校重大重点项目培育)(2021ZDPY0107)资助。

摘　　要：基于变Pr;模型对超临界甲烷的流动换热特征进行研究,建立不同几何结构参数的管道模型,对比研究管道浮升力、离心力、重力、流动加速对流动换热影响。结果表明,修正Pr;后的湍流模型将模拟误差由12%以上降至6%以下;换热系数随缠绕直径的减小而增大,减小缠绕管的缠绕直径可以减弱流动加速对传热的恶化作用;换热系数随管道直径的减小而增大,减小管道直径可以增强浮升力对传热的强化作用;重力、浮升力和离心力耦合作用使得绕管内湍动能分布发生向内下侧的偏移。The flow and heat transfer characteristics of supercritical methane were investigated based on the variable Pr;model. A winding tube model with different geometrical structure parameters were established to compare and investigate the effects of buoyancy, centrifugal force, gravity and flow acceleration on fluid flow and heat transfer. The results show that the modified Pr;turbulence model reduces the simulation error from over 12% to less than 6%;the heat transfer coefficient increases with the decrease of winding diameter. Reducing the winding diameter of the wound tube can weaken the deterioration of flow acceleration on heat transfer;the heat transfer coefficient increases with the decrease of tube diameter. Reducing tube diameter can enhance the enhancement effect of buoyancy on heat transfer;the coupling effect of gravity, buoyancy and centrifugal force makes the turbulent kinetic energy distribution in the tube shift inward and downward.

关 键 词：超临界甲烷 PR 模型 缠绕管 换热性能 数值模拟 

分 类 号：TK01[动力工程及工程热物理]