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为了探讨湍流度对一种新型气膜孔射流气膜冷却影响,利用商业软件提供的有限体积法求解N-S方程,对湍流度分别为0.4%、10%和20%时的双出口孔射流冷却效率进行数值模拟。吹风比变化范围为0.5到2.0。首先将圆柱孔射流冷却效率计算结果和实验数据进行了对比,二者吻合较好。计算得到了双出口孔射流气膜冷却下的流场、径向平均冷却效率。结果表明,湍流度和吹风比对冷却效率都有较大影响。湍流度为0.4%和10%时,最高冷却效率在吹风比1.0时获得;湍流度30%时,最高冷却效率在吹风比2.0时获得。吹风比0.5和1.0时,冷却效率随着湍流度的增加而降低;吹风比2.0时,冷却效率随着湍流度的增加而增加。
In order to investigate the effect of turbulence on the film cooling of a new type of film-hole jet, the finite volume method provided by the commercial software was used to solve the NS equation. The jet cooling efficiency of double outlet holes at the turbulence degrees of 0.4%, 10% and 20% Numerical simulation. Blow ratio range of 0.5 to 2.0. First, the calculated results of the cooling efficiency of the cylindrical hole jet were compared with the experimental data, the two agree well. The flow field and the radial average cooling efficiency of the double exit hole jet film were calculated. The results show that the turbulence and blowing ratio have a greater impact on the cooling efficiency. When the turbulence degree is 0.4% and 10%, the maximum cooling efficiency is obtained at the blow ratio of 1.0. When the turbulence degree is 30%, the maximum cooling efficiency is obtained at the blow ratio of 2.0. When the blowing ratio is 0.5 and 1.0, the cooling efficiency decreases with the increase of turbulence. When the blowing ratio is 2.0, the cooling efficiency increases with the increase of turbulence.