摘要
对无肋和带45°肋气膜冷却平板通道的三维对流换热与导热耦合传热问题进行了数值模拟。网格划分采用非结构化网格,湍流模型为SSTk-ω模型,近壁处采用壁面函数法,采用SIMPLEC算法求解速度和压力的耦合。计算获得了无肋和带45°肋气膜冷却平板的流场分布和平板内外表面的平均温度和平均换热系数。计算结果表明,带45°肋的气膜冷却平板表面平均温度较无肋气膜冷却平板表面平均温度低,而近气膜孔区域冷、热表面平均换热系数较无肋时高,而且肋的存在对增大冷空气出流比有利。
A numerical simulation was performed of the coupled heat transfer problem involving the three-dimensional convection heat exchange and heat conduction in a gas film-cooled flat plat channel without ribs and with 45o ribs. A non-structured network was adopted for network division. The turbulent flow model is of a SST k-ω one. A wall function method has been adopted for the near-wall location. The coupling of speed and pressure was solved by using a SIMPLEC algorithm. Through calculations obtained were for the gas film-cooled flat plate without ribs and with 45° ribs a flow field distribution and the average temperature and average heat exchange factor at the flat plate inner and outer surface. The calculation results indicate that the channel flow-field structure of the gas film-cooled flat plate with 45° ribs is relatively complicated. The surface average temperature of the flat plate is lower than that of the gas film-cooled flat plate without ribs. However, the cold and hot surface average heat exchange factor near the gas-film pore zone is higher than in the case when no ribs are provided. Furthermore, the presence of ribs is favorable for enhancing cold-air outward flow ratio.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2005年第4期411-413,共3页
Journal of Engineering for Thermal Energy and Power
关键词
肋
气膜冷却
温度
换热系数
数值模拟
出流比
rib, gas film cooling, temperature, heat exchange factor, numerical simulation, outward flow ratio
