摘要
为改善薄壁双层壁叶片的气膜冷却特性,基于圆锥孔构建了圆锥组合孔,并对心形孔结构进行优化,研究了2种气膜孔在不同吹风比下的冷却、流动特性以及气膜孔内涡旋结构对射流涡旋结构的影响。结果表明:气膜孔入口处射流发展对出口射流的冷却、流动特性具有决定作用;气膜孔下游射流涡旋结构与吹风比有关,当吹风比为1.0时,心形孔和圆锥组合孔的气膜冷却效率均达到最高;心形孔下游中心区域为典型的反肾形涡旋结构,当吹风比为1.0时其气膜冷却效率相较于圆锥组合孔提高了约8%。
In order to improve the film cooling characteristics of thin-double-walled blades, a conical combined hole was constructed based on the conical hole, and the structure of the heart shaped hole was optimized, so as to study cooling and flow characteristics of two types of film holes at different blowing ratios, as well as the effects of vortex structure in film hole on jet vortex structure. Results show that the development of jet at the inlet of filming hole has decisive effect on cooling and flow characteristics of the outlet jet. The jet vortex structure downstream the film hole depends on blowing ratio, film cooling effectiveness of both heart shaped hole and conical combined hole reaches the maximum at the blowing ratio of 1.0. The central area of downstream the heart shaped hole shows as a typical inverse renal vortex structure. When the blowing ratio is 1.0, film cooling efficiency of the heart shaped hole is about 8% higher than that of the conical combined hole.
作者
叶秀
武美萍
缪小进
陆佩佩
YE Xiu;WU Meiping;MIAO Xiaojin;LU Peipei(School of Mechanical Engineering,Jiangnan University,Wuxi 214122,Jiangsu Province,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2021年第12期1045-1053,共9页
Journal of Chinese Society of Power Engineering
关键词
薄壁双层壁叶片
心形孔
圆锥组合孔
短长径比
流动特性
thin-double-walled blade
heart shaped hole
conical combined hole
short aspect ratio
flow characteristics
作者简介
叶秀(1996-),女,江苏沭阳人,硕士研究生,研究方向为航空发动机高温部件冷却结构优化。电话(Tel.):15061883054,E-mail:15061883054@163.com。
