Detached Eddy Simulation of Vortex Structure and Flow Loss of Flat Film Cooling

被引：0
|
作者：
Wu Q. [1 ,2 ]
Yin Z. [1 ,2 ,3 ]
Zhang H.-L. [1 ,2 ,3 ]
Xu Y.-J. [1 ,2 ,3 ]
Chen H.-S. [1 ,2 ,3 ,4 ]
机构：
[1] Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing
[2] University of Chinese Academy of Sciences, Beijing
[3] Nanjing Institute of Future Energy System, Institute of Engineering Thermophysics, Chinese Academy of Science, Nanjing
[4] Dalian National Laboratory for Clean Energy, CAS, Dalian
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2023年 / 44卷 / 05期
关键词：
Aerodynamic loss; Cooling air mixing; Detached-eddy simulation; Film cooling; Gas turbine; Reynolds stress; Upright vortex;
D O I：
10.13675/j.cnki.tjjs.2203067
中图分类号：
学科分类号：
摘要：
The interaction between mainstream and cooling air will form a complex vortex structure and cause mixing losses，while the film cooling protects the high temperature parts. It is extremely important to study the interaction mechanism between loss and vortex structure for optimizing air-cooled turbine structure. The DES （Detached Eddy Simulation）method was used to compute the unsteady film-cooling flow field of flat plate cylinder hole，then the evolution law of the vortex system and the mixing loss were analyzed. As results，there are two different motion modes in the film flow field dominated by the windward vortex with the increase of the blowing ratio. The downstream cooling air at low blowing ratio is mainly controlled by the clockwise windward vortex，and at high blowing ratio，the anti-clockwise windward vortex and the clockwise leeward vortex simultaneously control the movement of the downstream cooling air. Spectral analysis shows that there is a clear multiple relationship among the flow field disturbance frequencies. The fundamental frequency signal is generated by the shedding vortex，and the frequency is linearly related to the blowing ratio. Loss analysis shows that the flow field loss，which accounts for more than 90% of the entropy loss，is mainly caused by the heat transfer between the cooling air and the mainstream. © 2023 Journal of Propulsion Technology. All rights reserved.
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