Fluid flow and heat transfer characteristics in the leading of blades at rotating state
-
摘要: 用数值模拟的方法对旋转状态下涡轮叶片前缘冷却结构进行了数值研究,该结构由进气腔、叶片尾缘块和前缘块构成,对此结构不同的旋转速度情况进行了计算,根据计算结果分析了旋转对涡轮叶片前缘流动与换热的影响.计算结果表明,旋转状态下带气膜出流的冲击流动中,前尾缘冲击面的换热随着转速的增加而减小,且尾缘冲击面的换热比前缘冲击面的换热要好;同时前尾缘冲击面换热的差别随着转速的增加将越来越小.Abstract: Numerical simulation was performed to study the cooling configuration in the leading of blades at rotating state. The configuration was consisted of entering gas cavity, trailing edge and leading edge blocks. Computation was carried out for the different rotating velocity. The influence of rotating velocity on the fluid flow and heat transfer characteristics of this configuration was carried out. To impinging flow along the blade with outflow film under rotating state,the conclusion of numerical computation is given as follows:The heat transfer of the leading and trailing impingement surfaces are enhanced with the rotating velocity increasing. The heat transfer at the blade trailing impingement surface is stronger than at the leading impingement surface. The difference of heat transfer between the leading and trailing impingement surfaces decreases with the rotating velocity increasing.
-
Key words:
- heat transfer /
- numerical computation /
- rotating /
- impingement cooling
-
[1] Martin H. Heat and mass transfer between impinging gas jets and solid surface . Advances in Heat Transfer, 1977, 13:1~60 [2] Choi M, Seoung H, Yang G. Measurements of impinging jet flow and heat transfer on a semi-circular concave surface[J]. International Journal of Heat and Mass Transfer,2000,43:1811~1822 [3] Akella K V, Han J C. Jet impingement cooling in rotating two-pass rectangular channels with smooth walls . AIAA-97-2488,1997 [4] Epstein A H, Kerrebrock J L, Koo J J. Rotational effects on impingement cooling[M]. Hemisphere Publ Corp, 1987. 86~102 [5] 吴 宏,陶 智,徐国强,等.带气膜出流的旋转叶片冲击冷却的实验研究[J].航空动力学报,2000,15(4):375~380 Wu Hong,Tao Zhi,Xu Guoqiang,et al. Experiments of impinging cooling in leading edges of rotating blades with outflow film[J].Journal of Aerospace Power, 2000,15(4):375~380(in Chinese) [6] 陶文铨. 数值传热学[M]. 西安:西安交通大学出版社,2001 Tao Wenquan. Numerical heat transfer [M]. Xi'an:Xi'an Jiaotong University Press, 2001(in Chinese)
点击查看大图
计量
- 文章访问数: 3095
- HTML全文浏览量: 172
- PDF下载量: 1227
- 被引次数: 0