微小孔径旋转冲击射流换热特性的数值模拟  

Numerical Simulation of Heat-Transfer Characteristics of Swirling Impinging Jet with Micro-Aperture

作　　者：王长宏[1] 朱冬生[1] 涂娟[2] 汪南[1] 

机构地区：[1]华南理工大学传热强化与过程节能教育部重点实验室,广东广州510640 [2]广东省电力设计研究院,广东广州510600

出　　处：《华南理工大学学报（自然科学版）》2009年第3期47-52,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50376076);教育部新世纪人才支持计划项目(NCE040826)

摘　　要：采用数值模拟方法模拟了旋转冲击射流的换热过程,分析了换热过程中喷射孔径、喷射间距、旋转角速度以及流场分布特性对冲击射流换热的表面传热系数与平均换热效果的影响.结果表明:相同雷诺数下,3mm孔径射流的平均换热效果比6mm孔径的强;大孔径射流时的平均传热系数受角速度的影响要比小孔径时大;角速度的增加使换热板上的最大换热系数减小且由驻点向外偏移;旋转使板上的换热更加均匀,表现为角速度越高,平均表面传热系数曲线越平坦.In this paper, the heat transfer of swirling impinging jet is numerically simulated, and the effects of injection aperture, injection distance, swirling angular velocity and flow-field distribution characteristics on the surface heat-transfer coefficient and the average heat-transfer effect are analyzed. The results indicate that, with the same Reynolds number, the average heat-transfer effect of the jet from 3 mm-diameter nozzle is better than that from the 6 mm-diameter one, that the average heat-transfer coefficient of the jet form big-diameter nozzle is more greatly affected by the swirling angular velocity, that the maximum heat-transfer coefficient decreases as the swirling angu- lar velocity increases, with the peak value moving away from the stagnation point, and that the curve of average heat-transfer coefficient becomes more fiat as the swirling angular velocity increases, meaning that the swirling resuits in uniform heat transfer.

关 键 词：旋转冲击射流 数值模拟 表面传热系数 换热特性 

分 类 号：TB61[一般工业技术—制冷工程]