摘要
本文通过数值模拟分析圆柱孔和扩散孔的单斜孔气膜冷却特性,考察复合角、孔型和吹风比对流场和气膜冷却效果的影响。结果表明,复合角的引入使气膜侧向分布更宽,但冷却效果沿主流方向衰减更快。适中吹风比得到的气膜能更有效的保护壁面。在相同吹风比和复合角条件下,扩散孔的气膜冷却效率比圆柱孔更好,且冷却更为均匀持久。
A numerical simulation has been conducted to investigate the film effectiveness of film cooling using a single hole with two types of geometry: cylindrical hole with constant cross section and shaped hole with conically widened exit. The film cooling jet was injected through a 30° inclined hole to the surface and with lateral directions of 0°, 45° and 90°, for the blowing rates of 0.5, 1.0 and 2.0, respectively. Taking into consideration of film effectiveness, film coverage, average cooling capability, uniformity of film and amount of coolant, etc., the analysis indicates that the injected jet through the straight hole with compound angle spreads widely immediately downstream but lasts shortly, and that the film protects the surface effectively at moderate blowing rate. The use of a shaped hole shows noticeable advantage.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2004年第6期1034-1036,共3页
Journal of Engineering Thermophysics
基金
中国博士后科学基金资助(No.18152)
关键词
气膜冷却
单孔
数值模拟
复合角
扩散孔
film cooling
single hole
numerical simulation
compound angle
shaped hole
