大型轴类工件喷气冷却流动和传热特性的数值模拟  

Numerical simulation of flow and heat transfer of air jets cooling for large-scale industrial shafts

作　　者：姜泽毅[1] 柳翠翠[1] 张欣欣[1] 马强[2] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]中国航空规划建设发展有限公司,北京102206

出　　处：《热科学与技术》2011年第4期287-290,共4页Journal of Thermal Science and Technology

摘　　要：以某喷气冷却装置为参考,对缝隙喷气冷却大型轴类工件展开研究。通过数值模拟研究了具有两相对缝隙的大型轴类工件(直径D=1 000～3 000mm)喷气冷却装置内的流动传热特性,对比数值计算结果与实验数据验证了模型预测的准确性,探讨了大型喷气冷却装置内部气体的流动特点,分析了双缝隙喷气冷却轴类工件的传热规律,获得了轴类工件表面平均Nu与Re和无量纲曲率半径(D/B)的回归表达式。结果表明:平行于轴向方向,缝隙射流冲击区域和壁面射流区域轴向速度较小,射流以外区域轴向速度相对较大,平均轴向速度随装置高度的增加而增加;工件轴截面平均Nu不随装置高度的变化而变化;轴类工件表面平均Nu(Num)随D/B的增大而减小。Slot jets impingement cooling for large-scale industrial shafts was studied based on an air jets cooling equipment. Flow and heat transfer of air jets cooling equipment, formed by two face-to- face slots, for large-scale industrial shafts （Diameter. D----1 000 - 3 000 mm） was numerical investigated. The numerical model was validated by comparing with experimental data. Air flow and heat transfer characteristics of big air jets cooling equipment were discussed. The correlation of average Nu for large-scale industrial shafts in terms of Re and dimensionless curvature radius （D/B） was obtained. The results show that： Axial velocity is small in the slot jets and wall jets regions but it＇s larger beyond the jets. Average axial velocity increases with increasing height of the equipment. Average Nu of axial section doesn＇t change with the height. Average Nu （Num） of large-scale industrial shafts decreases with increasing D/B.

关 键 词：大型轴类工件 喷气冷却 流动传热 数值模拟 

分 类 号：TK011[动力工程及工程热物理]