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.
出处
《热科学与技术》
CAS
CSCD
2011年第4期287-290,共4页
Journal of Thermal Science and Technology
关键词
大型轴类工件
喷气冷却
流动传热
数值模拟
large-scale industrial shafts
air jets cooling
flow and heat transfer
numerical simulation
