摘要
对充分发展的过热蒸汽湍流射流冲击平板的流动和换热进行了数值研究,分析了射流温度和射流雷诺数对蒸汽射流冲击换热的影响,并与空气射流冲击换热进行了比较。通过AKN k-ε、V2F和SST k-ω三种湍流模型计算结果的对比可知,SSTk-ω模型模拟冲击射流流动和换热的效果最好。研究表明:在相同条件下蒸汽的冲击换热能力强于空气;射流温度的变化对空气的冲击换热基本没有影响,但是对蒸汽有较大影响;射流雷诺数越大,则蒸汽冲击射流的换热越强。
A numerical study of the flow and heat transfer characteristics of a fully developed steam jet impinging on a flat plate is performed,Reynolds number based on nozzle exit condition is varied from 10000 to 30000 and steam temperature ranged from 375 K to 500 K.The effects of Reynolds number and steam temperature on the impingement heat transfer are analyzed,and compared with air jet impingement.The results show that the performance of SST k-ωturbulence model used for impinging jet predictions is better than AKN k-ωand V2F turbulence models.Under the same conditions,the impingement cooling capability of steam is more powerful than that of air.The heat transfer coefficient for steam jet is more sensitive to its temperature than that for air jet.The local Nusselt number is increases as the steam jet Reynolds number increases.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2010年第5期831-834,共4页
Journal of Engineering Thermophysics
关键词
蒸汽冷却
冲击射流
强化传热
数值模拟
steam cooling
jet impingement
heat transfer enhancement
numerical simulation
