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为了研究内冷通道横流条件下气膜冷却的流动和换热特性,采用窄带瞬态液晶测量技术获得了内冷通道横流条件下吹风比分别为0.5,1,2时气膜孔下游冷却效率和表面传热系数云图,并通过数值模拟得到了气膜孔内及下游区域流场的详细信息.结果表明:内冷通道横流对气膜孔下游冷却效率和表面传热系数分布有重要的影响.横流增强了气膜孔射流的展向分布能力,增强了高吹风比时气膜冷却效果.另外,气膜孔下游涡的分布出现明显的不对称性,涡的结构更加复杂.
In order to study the flow and heat transfer characteristics of the film cooling under cross-flow conditions, narrow-band transient liquid crystal measurement technology was used to obtain the cooling efficiency and Surface heat transfer coefficient cloud and get the detailed information of the flow field in the inner and the downstream of the film hole by numerical simulation.The results show that the cross flow of the inner cooling channel has an important influence on the cooling efficiency and the surface heat transfer coefficient distribution downstream of the film hole. The cross-flow enhances the jet distribution ability of the film and enhances the film cooling effect at high blow ratio. In addition, the distribution of the vortex downstream of the film hole shows obvious asymmetry and the vortex structure is more complicated.