摘要
开展了整环机匣的热辐射-对流耦合计算,获得了综合传热系数拟合关系式,并进行了实验测试验证。研究发现:封闭腔内,热辐射的存在大幅强化了壁面换热,辐射热流占总换热量比值可达90%以上。在3层机匣结构中,当发射率在0.3~0.8变化时,机匣沿径向方向上的温度梯度减小,主流区域的对流换热得到加强,半封闭区域对流强度降低。发射率为0.8时,外机匣流体侧壁面的辐射热流占总换热量的33.3%。
The heat radiation-convection coupling calculation of the entire ring casing was carried out,the comprehensive heat transfer coefficient fitting relationship was obtained,and the experimental test was verified.The study found that the existence of heat radiation in the enclosed cavity greatly strengthened the wall heat transfer.The ratio of radiant heat flow to the total heat transfer can reach more than 90%.In the three-layer receiver structure,when the emissivity changed from 0.3 to 0.8,the temperature gradient in the radial direction of the receiver decreased,the convective heat transfer in the mainstream area was strengthened,and the convective intensity in the semi-enclosed area decreased.When the emissivity was 0.8,the radiant heat flow on the fluid sidewall of the outer casing accounted for 33.3%of the total heat transfer.
作者
陈皓
李嘉伟
史航
汪彤
宋方舟
王天壹
刘向雷
CHEN Hao;LI Jiawei;SHI Hang;WANG Tong;SONG Fangzhou;WANG Tianyi;LIU Xianglei(Shenyang Engine Research Institute,Aero Engine Corporation of China,Shenyang 110015,China;College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2022年第8期1597-1606,共10页
Journal of Aerospace Power
基金
国家科技重大专项(2017-Ⅲ-0010-0036)。
关键词
涡轮机匣
机匣实验
自然对流
流固耦合
辐射换热
turbine casing
casing experiment
natural convection
fluid-solid coupling
radiation heat transfer
