Numerical analysis on effects of coolant swirling motion on film cooling performance
Numerical analysis on effects of coolant swirling motion on film cooling performance
复制标题
冷却剂旋流运动对气膜冷却性能影响的数值分析
DOI：
10.1016/j.ijheatmasstransfer.2015.07.055
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发表时间：
2015-11
影响因子：
5.2
通讯作者：
Feng Zhenping
中科院分区：
文献类型：
--
作者：
Yang Xing;Liu Zhao;Liu Zhansheng;Feng Zhenping
对燃气涡轮机端壁圆柱形、三叶草形和复合角孔气膜冷却性能进行了数值研究。通过调节安装在涡流室底壁上与垂直方向成一定角度的两个小喷孔，在涡流室内获得不同的旋流数和正、反旋流方向的旋流冷却剂射流。采用雷诺平均Navier-Stokes方程（RANS）和SSTk-ω湍流模型，在等密度比为1.5，吹风比为0.5 ~ 1.5的范围内进行了数值模拟。结果表明，对于3种典型气膜孔，适当的旋流作用可以显著提高气膜冷却效率。复合角气膜孔的气膜冷却效率不仅对旋流强度敏感，而且对旋流方向也很敏感。对于圆柱形和三叶草形气膜孔，旋流射流对气膜冷却的强化效果不同，而对于复合角气膜孔，在高吹风比下，旋流射流会降低喷射强化换热效果。对于三叶草形孔，气膜冷却对端壁净换热量的减少在射流角θ= ±20°时达到最大值，而对于圆柱形孔和复合角孔，则取决于吹风比和旋流方向。
A numerical study on effects of swirling coolant on film cooling performance is conducted for cylindrical, clover shaped and compound angle holes on a gas turbine endwall model. Various swirl numbers and positive and negative swirling direction of the swirling coolant jet are attained inside a swirl chamber by adjusting two small jet holes, which are installed on the swirl chamber bottom wall and incline at a certain jet angle to vertical direction. Reynolds-averaged Navier–Stokes (RANS) with SSTk–ωturbulence model simulation is performed at a constant density ratio of 1.5 and a range of blowing ratio from 0.5 to 1.5. Compared with the case for non-swirling coolant, the results show that properly applying swirling motion into the coolant could dramatically improve the film cooling effectiveness for the three types of typical film holes. The film cooling effectiveness of the compound angle film hole is sensitive to not only the swirling strength but also the swirling direction. Heat transfer with film cooling is more or less enhanced by swirling jet in the case of cylindrical and clover shaped film holes, while the heat transfer enhancement by injection could be reduced by swirling jet at high blowing ratio for the compound angle film hole. The reduction of net heat transfer to the endwall with film cooling can achieve its maximum value at jet angle ofθ= ±20° for the clover shaped hole, while as to the cylindrical and compound angle holes it depends on blowing ratio and swirling direction.
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影响因子：
1.7
作者：
Y. Okita;M. Nishiura
通讯作者：
Y. Okita;M. Nishiura
影响因子：
1.7
作者：
K. Thole;M. Gritsch;A. Schulz;S. Wittig
通讯作者：
K. Thole;M. Gritsch;A. Schulz;S. Wittig
DOI：
10.1299/jsmeted.2004.283
发表时间：
2004
期刊：
--
影响因子：
--
作者：
Y. Kuya;C. Nuntadusit;H. Ishida;K. Momose;H. Kimoto
通讯作者：
Y. Kuya;C. Nuntadusit;H. Ishida;K. Momose;H. Kimoto
影响因子：
1.9
作者：
Bogard, DG;Thole, KA
通讯作者：
Thole, KA
DOI：
10.1115/gt2008-51361
发表时间：
2008
期刊：
--
影响因子：
--
作者：
D. Rigby;J. Heidmann
通讯作者：
D. Rigby;J. Heidmann