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首页> 外文期刊>International Journal of Heat and Mass Transfer >Multi-parameter influence on combined-hole film cooling system
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Multi-parameter influence on combined-hole film cooling system

机译：多参数对复合孔膜冷却系统的影响

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摘要

Combined-hole film cooling system is a promising way to improve cooling efficiency of gas turbine. New combined-hole systems, such as double-jet [14], anti-vortex design [16] and NIKOMIMI [15] are developed to overcome the kidney vortexes. Round-hole and double-jet, which are typical in design of combined-hole film cooling system, are investigated in this study experimentally and numerically. It is observed that the anti-kidney vortexes produced in double-jet film cooling system are controlled by the pitch and compound angle of the two holes. The pitch of double-jet unit determines the formation of anti-kidney vortexes led by the interaction between two vortexes, while the compound angle affects the strength of each branch of anti-kidney vortexes. Being two of the most important factors for film cooling of gas turbine, blowing ratio and density ratio, vary in degree of influence on film cooling effectiveness, and the key point is whether the cooling gas has blown off from the surface. It is possible to achieve high film cooling effectiveness with a combined-hole system when the geometry parameters, (compound angle, pitch, etc.), and aerodynamic parameters, (blowing ratio, density ratio, etc.) match well on local flow structure.
机译：组合孔膜冷却系统是提高燃气轮机冷却效率的有前途的方法。新的组合孔系统，例如双射流[14]，抗涡流设计[16]和NIKOMIMI [15]被开发来克服肾脏涡流。通过实验和数值研究，对复合孔膜冷却系统设计中典型的圆孔和双射流进行了研究。观察到在双射流薄膜冷却系统中产生的反肾脏旋涡由两个孔的间距和复合角控制。双射流单元的螺距决定了由两个涡流之间的相互作用导致的反肾涡的形成，而复角影响反肾涡的每个分支的强度。吹气比和密度比是燃气轮机薄膜冷却的两个最重要的因素，其对薄膜冷却效率的影响程度各不相同，而关键是冷却气体是否已从表面吹散。当几何参数（复合角，螺距等）和空气动力学参数（吹塑比，密度比等）在局部流动结构上很好地匹配时，使用复合孔系统可以实现较高的薄膜冷却效率。

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