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为了解单孔结构平板气膜的冷却特性,该文对不同吹风比条件下的流场(M=0.75,1.0,1.5)进行了数值模拟,计算域采用FNM(fullnon-matched)形式的蝶形结构化网格来模拟射流,计算格式采用了包括LU-SGS-GE(lower upper symmetric Gauss Seidel Gaussian Elimination method)隐式格式和改良型高精度、高分辨率的MUSCLTVD(monotone upstream-centred scheme for conservation laws,total-variation-dim inishing)格式的时间推进算法求解三维Navier-Stokes方程以及低Reynolds数双方程湍流模型。计算结果表明随着吹风比的不断增大,由于卷吸作用的增强,射流大部分脱离壁面与主流进行掺混使得气膜冷却效率不断降低,这与实验所得结果基本吻合。
In order to understand the cooling characteristics of flat film with single-hole structure, the numerical simulation of the flow field (M = 0.75, 1.0, 1.5) under different blowing ratio conditions is carried out. The calculation domain is a butterfly with fullnon-matched (FNM) Structured meshes were used to simulate jets. The computational format adopted MUSCLTVD (monotone upstream-centred scheme for conservation) including implicit scheme of lower upper symmetric Gauss Seidel Gaussian Elimination method and improved high-precision and high-resolution laws, total-variation-diminishing) format to solve three-dimensional Navier-Stokes equations and low Reynolds number two-equation turbulence model. The calculation results show that with the increase of blowing ratio, the cooling efficiency of the film decreases due to the enhancement of entrainment, and most of the jet is mixed with the mainstream to separate the wall from the mainstream, which agrees well with the experimental results.