各向异性复合材料平板气膜冷却试验研究

Experimental Study of Film Cooling Over a Composite Flat Plate With Anisotropic Thermal Conductivity

针对导热系数各向异性的长纤维增韧复合材料平板,开展了气膜冷却效果的试验研究,详细分析了复合材料各向异性导热系数主方向同气膜出流角之间的偏角对气膜覆盖壁面冷却效果的影响.研究中发现,不同的偏角工况下,由于材料内部不同方向上导热能力的差异,气膜冷却的综合效果发生了较明显的改变.试验结果表明流向偏角α的增加,使得气膜覆盖壁面的平均综合冷却效率和温度分布均匀性均得到提升;展向偏角β对气膜覆盖壁面的平均综合冷却效率影响不大,但是β增加时,壁面温度分布的均匀性得到一定程度的改善。

Experimental study was performed to investigate the film cooling performance for a flat plate with anisotropic thermal conductivity where the plate had a single row of round holes. The effects of two angles on the cooling effectiveness were studied, i.e. the axial angleα and the spanwise angleβ, with regards to the inclined angle between the main thermal conductivity in the plate and the mainstream flow direction. The results showed that the anisotropy of the thermal conductivity and the inclined angles affected the cooling effectiveness obviously. Both of the average cooling effectiveness and the uniformity of temperature distribution were improved with a larger α. The β had little influence on the average cooling effectiveness, but affected the uniformity of temperature distribution.