摘要
为了研究动量比、湍流度和密度比对圆柱形气膜孔流动的影响规律,文章采用数值模拟方法,研究了圆柱形气膜孔的冷却效率,并与实验值进行了对比。结果表明,随着动量比的增大,二次流在气膜孔出口处逐渐偏离叶片;气膜孔出口下游存在1个高速区域,动量比增大,这一区域的速度随动量比的增大而减小。在湍流度和密度比保持不变的情况下,随着动量比增加,冷却效率计算值随着距离的增加在总体上呈现逐渐减小的趋势。在低密度比下,湍流度对冷却效率影响不大;当密度比为1.5时,湍流度的不同导致冷却效率产生显著差异,密度比越小,冷却效率越低。在喷口处,数值计算值与实验值存在一定的差异。数值模拟的结果能够定性地反映气膜孔的流动特性。
Section 1 of the full paper briefs the simulation procedure we have customarily employed and outlines the numerical simulation work done that is reported in this paper.Section 2 presents the simulation results,given in Figs.3 through 6,and their analysis;they show preliminarily that：（1） with increasing momentum ratio,the secondary flow deviates from the blade surface at the outlet of the gas film hole;there is an area of high speed with decreasing momentum ratio;（2） generally,the cooling effectivenesses decreases with increasing non-dimensional distance x/d when both the turbulence intensity and the density ratio are kept constant;（3） there is an obvious difference between numerical values and experimental values at the region near the exit of the gas film hole.All in all,numerical simulation,in our opinion,can determine the nature of the characteristics of gas-film flow.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2010年第6期911-915,共5页
Journal of Northwestern Polytechnical University
基金
大型动力装备制造基础研究基金(2007CB70770102)资助
关键词
动量比
湍流度
气膜孔
冷却效率
aircraft engines
cooling
turbomachine blades
turbulence
flow
momentum ratio
turbulence intensity
gas film
cooling effectiveness
作者简介
许卫疆（1974-），西北工业大学讲师，主要从事航空发动机高温部件冷却研究。
