设计了单排,双排和三排分布形式和不同孔径的离散气膜孔结构,采用实验的方法分别对其对流换热特性进行了研究。研究结果表明,对流换热系数随着吹风比的增大而增大。在小吹风比时,沿冷却壁面的对流换热系数变化分为3个区段,在较大的吹风比或者孔径较大时,离散孔气膜冷却对流换热系数的分布规律与气流横掠平壁的对流换热规律基本相似。此外,在气膜孔当量直径一定的情况下,气膜孔的排列形式和吹风比均对对流换热系数有显著的影响。 The single-row, double-row and three-row disperse film pore structures with different pore sizes were designed. The convection heat transfer characteristics of the films were experimentally studied. The results show that the convective heat transfer coefficient increases with the increase of blowing ratio. At small blowing ratio, the convective heat transfer coefficients along the cooling wall are divided into three sections. When the blowing ratio is large or the diameter is large, the distribution of convective heat transfer coefficient and the sweeping Flat wall convection heat transfer law is similar. In addition, when the equivalent diameter of the film holes is constant, the arrangement of the film holes and the blowing ratio all have a significant influence on the convection heat transfer coefficient.