摘要
采用数值模拟方法,研究了不同吹风比下孔排间距对复合角双射流气膜冷却特性的影响。结果表明,较小的孔排间距形成的反肾形涡为上下结构且不对称,冷却效果提高有限;而较大的孔排间距有利于形成左右对称的反肾形涡,能够在下游形成大面积的展向冷气覆盖,同时射流更好地贴附于壁面,大大提高了冷却效率;并将该结构应用到某重型燃气轮机静叶上,取得了良好的冷却效果。
By using a numerical simulation method,studied was the influence of the hole-row spacing on the air-film cooling characteristics of a dual jet flow with a composite angle at different air ratios.It has been found that the reverse kidney shaped vortex formed by a relatively small hole-row spacing is of a upper and lower structure and unsymmetrical and the improvement of the air-film cooling effectiveness is limited while a relatively large hole-row spacing is favorable for forming a right and left symmetrical reverse kidney shaped vortex,capable of forming a large area cooling air coverage along the chord direction at the lower reaches and meanwhile making the jet flow attached to the wall surfaces better,thus greatly enhancing the cooling efficiency.Such a structure was applied in the stator blades of a heavy-load gas turbine and a good cooling effectiveness was achieved.
出处
《热能动力工程》
CAS
CSCD
北大核心
2011年第5期513-517,627-628,共5页
Journal of Engineering for Thermal Energy and Power
基金
国家重点基础研究发展规划(973)基金资助项目(2007CB210108)
关键词
气膜冷却
双射流
孔排间距
反肾形涡
air-film cooling,dual jet flow,hole-row spacing,reverse-kidney-shaped vortex
