摘要
为了揭示超临界甲烷(S-CH_(4))热交换器的传热机理,针对180°弯管内S-CH_(4)非均匀对流传热特性进行了研究。在验证数值方法可靠性基础上,获得了S-CH_(4)热物性场纵向和径向分布以及迪恩涡变化规律,并对比了弯管和直管换热能力。研究结果表明:受离心力、重力和弯管连续曲率共同影响,弯管纵向截面上S-CH_(4)热物性参数呈现明显的分界线且“非同心圆”分布;弯管内迪恩涡核心位置靠近于内壁;同时,迪恩涡有助于强化S-CH_(4)传热能力,局部弯管传热系数最大值位于内壁附近;当质量通量分别为300 kg/m^(2)·s和600 kg/m^(2)·s时,相比于直管,弯管传热系数增幅分别为18.8%和23.5%。研究结果为S-CH_(4)热交换器优化设计和应用提供了参考依据。
In order to reveal the heat transfer mechanism of supercritical methane(S-CH_(4))heat exchanger,the non-uniform convection heat transfer characteristics of supercritical methane(S-CH_(4))in a 180°curved duct are numerically analyzed.On the basis of verifying the reliability of the numerical method,the longitudinal and radial distribution of S-CH_(4) thermo-physical properties field and the distribution characteristics of“Dean vortices”are obtained,and the heat transfer capacity of curved duct and straight tube is compared.The results show that under the combined action of centrifugal force,gravity and continuous curvature of curved duct,the thermal properties of S-CH_(4) on the longitudinal section of curved duct present an obvious boundary line,and thermal-physical properties of S-CH_(4) on the radial section present the“non-concentric circle”distribution.The core position of“Dean vortices”is close to the inner wall of curved duct.At the same time,“Dean vortices”is helpful to enhance the heat transfer of S-CH_(4),the maximum value of local heat transfer coefficient locates in the inner wall of the curved duct.Compared with the straight tube,when the mass flux is 300 kg/m^(2)·s and 600 kg/m^(2)·s,the heat transfer coefficient of curved duct increases respectively by 18.8%and 23.5%.It provides a reference for the optimal design and application of S-CH_(4) heat exchanger.
作者
韩昌亮
尹鹏
韩芳明
贾际
许麒澳
辛镜青
姚安卡
HAN Chang-liang;YIN Peng;HAN Fang-ming;JIA Ji;XU Qi-ao;XIN Jing-qing;YAO An-ka(School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin,150080, China;Aerospace Haiying (Harbin) Titanium Co., Ltd., Harbin, 150029, China)
出处
《哈尔滨理工大学学报》
CAS
北大核心
2022年第3期30-36,共7页
Journal of Harbin University of Science and Technology
基金
国家自然科学基金(22108050)
黑龙江省百千万重大科技专项项目(2020ZX10A0038).
关键词
超临界甲烷
非均匀
传热
弯管
迪恩涡
supercritical methane
non-uniformity
convection heat transfer
curved duct
Dean vortices
