超临界氢气在弯管中的流动换热计算  

Numerical Investigations of Supercritical Hydrogen Flow and Heat Transfer in Curved Tube

作　　者：周彪 吉宇[1] 孙俊[1] 孙玉良[1] 石磊[1] Zhou Biao;Ji Yu;Sun Jun;Sun Yuliang;Shi Lei(Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing,100084,China)

机构地区：[1]清华大学核能与新能源技术研究院

出　　处：《核动力工程》2019年第5期197-201,共5页Nuclear Power Engineering

基　　金：民用航天项目(D010501)

摘　　要：为探究超临界氢气流经喷管喉部时的流动换热特性,通过ANSYS FLUENT软件模拟超临界氢气在180°弯管中的流动换热现象,得到了氢气在弯管中的流场分布以及不同位置处的壁面温度分布。研究发现:由于离心力作用,管内氢气流动在弯管段向外侧径向偏移,产生了垂直于主流方向的二次流现象,使得内侧氢气流速低于外侧;由于弯管段的流量分布不均,导致弯管外侧换热得到强化,内侧则出现传热恶化现象。在本文研究工况下,弯管段出口附近的内侧壁面区域,壁面温度达到最高,传热恶化最为显著。In order to investigate the flow and heat transfer characteristics of the supercritical hydrogen running through the nozzle throat,this paper simulated the supercritical hydrogen flow in a 180°curved tube by ANSYS FLUENT,and obtained the velocity profiles and the wall temperature at various interested positions.It was found that the centrifugal force forced the hydrogen flow shift radially outward in the bend and induced the secondary flow perpendicular to the main flow,making the flow velocity on the inner side lower than that of the outer side.Furthermore,because of the non-uniform flow distribution along the circumferential tube wall,the heat transfer on the outer wall of the bend was strengthened,while deteriorated on the inner side.Based on the operating conditions in the current paper,the inner wall close to the exit of the curved section has the highest wall temperature,with the most notable heat transfer deterioration.

关 键 词：核热推进 超临界氢气 弯管 二次流 传热恶化 

分 类 号：TL329[核科学技术—核技术及应用]