摘要
本文通过对发汗冷却的多孔区域进行二维非热平衡数值模拟,研究了多孔介质区域进口处对流换热系数、冷却剂流量局部降低以及多孔介质受热表面热流密度局部增大对青铜、陶瓷两种不同多孔材料的温度场的影响。计算结果表明,冷却剂在进口处与多孔壁面对流换热系数的增大使多孔介质内部趋向于热平衡;热端壁面对流换热系数、冷却剂流量的局部变化对陶瓷多孔壁面在该局部区域的影响要大于青铜多孔壁面,但青铜多孔壁面受影响的区域更大,而冷却剂流量的局部降低对两种材料固体、流体间温差的影响程度基本一致。
The influence of local variations of boundary condition on the heat transfer process of transpiration cooling within the ceramic and bronze porous media was analyzed numerically.The Local Thermal Non-Equilibrium（LTNE） model was adopted to predict the temperature filed of the solid and fluid phases within a 2-D computational domain.The calculated results indicate that increasing the heat transfer coefficient on the cold side surface intended to decrease the LTNE effect. In addition,the local heat flux increase and local coolant injection rate reduction resulted in a more pronounced effect on the temperature magnitude at the corresponding region of the ceramic porous wall,whereas the influenced domain was restricted to a smaller area than that of the bronze porous wall.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2010年第4期667-670,共4页
Journal of Engineering Thermophysics
基金
国家自然科学重点基金项目(No.50736003)
973项目(No.2007CB210107)
关键词
发汗冷却
二维数值模拟
非热平衡
边界条件
transpiration cooling
2-D numerical simulation
local thermal non-equilibrium
boundary conditions
