气动加热表面内侧液氮冷却数值研究  

Numerical investigation of liquid nitrogen cooling on the inner side of surface under aerodynamic heating

作　　者：李业芳[1] 张靖周[1] 

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《航空动力学报》2010年第11期2514-2519,共6页Journal of Aerospace Power

摘　　要：以Fluent计算软件为平台,利用混合两相流模型和Lemmon提出的液氮物性表达式,通过编写用户自定义程序(UDFs)实现对液氮物性和气液相间传输项的模拟,从而对一侧表面模拟气动加热热流条件、另一侧表面为绝热条件的二维矩形狭缝通道内的液氮流动换热进行了数值模拟.结果表明,利用液氮狭缝通道强化换热可以实现对气动加热表面的有效冷却;冷却通道沿程换热效果随着质量流率的增大而提高;在单位表面积质量流率一致的情况下,通道长度的增长有利于改善气动加热表面的冷却效果.The commercial flow solver Fluent software was utilized to numerically simulate the heat transfer of liquid nitrogen through a two-dimensional narrow rectangular channel,with one side surface used for simulating aerodynamic heating flux condition and the other side surface as adiabatic condition.The mixture multiphase model and expressions of liquid nitrogen properties presented by Lemmon were adopted,and the user-defined functions（UDFs） were introduced to simulate the properties of liquid nitrogen and the transfers between gas phase and liquid phase.Results indicate that liquid nitrogen enhanced heat transfer inside the narrow channels enables efficient cooling of the surface suffering serious aerodynamic heating flux;the increase of liquid nitrogen mass-flux leads to an enhanced heat transfer;with a constant mass-flux-to-superficial-area-ratio;the ascending length of the channel improves the cooling effectiveness positively.

关 键 词：液氮 气动加热 相变 狭缝通道 强化换热 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]