基于二维瞬态导热反问题方法测量气体射流冲击换热系数  

Experimental measurement of air jet impinging heat transfer coefficient based on 2-D transient inverse heat conduction method

作　　者：丁翠娇[1] 豆瑞锋[2] 陈超[1] 田大鹏[1] 郭强[2] 温治[2] 

机构地区：[1]武汉钢铁(集团)公司研究院 [2]北京科技大学能源与环境工程学院

出　　处：《冶金能源》2017年第1期28-33,共6页Energy For Metallurgical Industry

基　　金：国家自然科学基金资助项目(51306016)

摘　　要：基于Levenber-Marquardt迭代法建立了二维瞬态导热反问题模型。结合实验,测定了厚规格材料表面射流冲击换热系数随着时间的变化规律。同时,采用RNG k-ε湍流模型建立了相应的CFD仿真模型。数值分析和实验结果表明:所建立的二维瞬态导热反问题模型能够准确计算表面换热系数;厚规格材料冷却过程中,冷却开始时,表面换热Nu数迅速上升。当冷却时间大于50s时,Nu数逐步趋于平缓并维持不变;由于材料内部横向热流的影响,瞬态实验的局部Nu数高于稳态实验的局部Nu数。Based on Levenber - Marquardt iteration method, a 2 - D transient inverse heat conduction method was built. Combined with experimental method, the convective heat transfer coefficients on the surface of thick target plate were measured. By using RNG k - ε turbulence model, a CFD mathematical was built. The numerical and experimental results indicate that the 2 - D transient inverse heat conduction method can obtain the convective heat transfer coefficient accurately; during the cooling of thick target plate, Nu number increases rapidly after the onset of air jet impinging, and reaches a plateau when the cooling time greater than 50s ; the local Nu number determined by transient experimental method is greater than steady experimental result, which is caused by lateral heat conduction inside the thick target plate.

关 键 词：导热反问题 对流换热系数 气体射流冲击 Levenber—Marquardt迭代法 

分 类 号：TK124[动力工程及工程热物理—工程热物理]