Effect of bleed hole on internal flow and heat transfer in matrix cooling channel
Effect of bleed hole on internal flow and heat transfer in matrix cooling channel
复制标题
排气孔对基体冷却通道内部流动和传热的影响
DOI：
10.1016/j.applthermaleng.2018.03.031
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发表时间：
2018-05
影响因子：
6.4
通讯作者：
Yigang Luan
中科院分区：
文献类型：
--
作者：
Haiou Sun;Tao Sun;Lianfeng Yang;Shi Bu;Yigang Luan
在燃气轮机叶片中，矩阵式是一种比传统的蛇形肋形通道传热更强、结构强度更高的内部冷却方案。在一些复合冷却设计中，冷却剂从内部通道抽到外腔以实现冲击。本文通过数值模拟分析了放血抽提对基体冷却通道内流场和传热的影响。采用RANS方法对流场和传热分布进行了详细的描述。所研究的矩阵通道由8个子通道组成，这些子通道形成两层，肋角为45°，子通道宽高比为1:1。结果表明，大尺度的顺流涡主导了子通道流动，从而增加了换热。抽提可以在排气孔周围产生极高的传热强化水平，并改变子通道中的流动结构。通过对不同孔径、孔位置和孔布置情况的比较，结果表明，排气孔位置对内部流动和换热的影响最为显著。子通道中心线与肋侧壁之间的排孔具有较强的换热性能。25%的萃取质量可保持内部基体冷却能力。虽然排气孔可以改善基体通道的热性能，但除非改变基体的基本结构，否则其热性能低于大多数传统的冷却方法。
Matrix is an internal cooling scheme which has advantages of stronger heat transfer and better structural strength than conventional serpentine ribbed channels in gas turbine blades. In some compound cooling designs, coolant is extracted from the internal channel to the outer chamber to realize impingement. This paper analyzes the effect of bleed extraction on the flow field and heat transfer in matrix cooling channel by numerical simulations. RANS method is employed to present detailed flow field and heat transfer distribution. The investigated matrix channel is comprised of eight sub-channels which form two layers, the rib angle is 45° and the sub-channel aspect ratio is 1:1. The results indicate that heat transfer augmentation is caused by the large-scale streamwise vortexes which dominate the sub-channel flow. Extraction can create extremely high heat transfer enhancement level around bleed holes and alter the flow structures in the sub-channel. Cases of different diameters, positions and arrangements of holes are compared and the result shows that the bleed position has the most significant effect on the internal flow and heat transfer. Bleed holes between the sub-channel centerline and rib-side wall can provide strong heat transfer and good thermal performance. The internal matrix cooling capacity can be maintained with 25% mass extraction. Although the thermal performance of matrix channel can be improved by bleed holes, it is lower than most of the conventional cooling methods unless the baseline matrix structure was modified.
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DOI：
10.1016/s0017-9310(98)00099-4
发表时间：
1998-12
影响因子：
5.2
作者：
S. Ekkad;Yizhe Huang;Je-Chin Han
通讯作者：
S. Ekkad;Yizhe Huang;Je-Chin Han
影响因子：
2.2
作者：
Sourabh Kumar;R. Amano;J. M. Lucci
通讯作者：
Sourabh Kumar;R. Amano;J. M. Lucci
DOI：
10.1115/94-gt-232
发表时间：
1994-06
期刊：
--
影响因子：
--
作者：
J. Shen;Z. Wang;P. Ireland;T. V. Jones;A. Byerley
通讯作者：
J. Shen;Z. Wang;P. Ireland;T. V. Jones;A. Byerley
DOI：
10.1115/gt2009-59873
发表时间：
2009
期刊：
--
影响因子：
--
作者：
I. Oh;K. Kim;Dong Hyun Lee;J. S. Park;H. Cho
通讯作者：
I. Oh;K. Kim;Dong Hyun Lee;J. S. Park;H. Cho
侧壁槽和针翅对涡轮叶片网格冷却通道性能的影响
影响因子：
6.4
作者：
Bu Shi;Yang Lianfeng;Qiu Hanghai;Luan Yigang;Sun Haiou
通讯作者：
Sun Haiou