Abstract: Using the method of constant heat flux, the convective heat transfer coefficients were investigated experimentally in the inclined multihole film cooling The main factors influencing the convective heat transfer include the blowing ratio,row to row spacing,hole to hole spacing and arrangement for inclined multihole The ranges of these parameters were:main fluid Reynolds number about 17 000 and blowing rates from 1 to 4 Measuremerts were done for 4 variant test plates The results indicated that the convective heat transfer coefficient increases greatly with film cooling and with the increasing of blowing rates for the same plate; the hole to hole spacing is more important than the row to row spacing for film cooling at the same condition

Key words: Gas turbine;Film cooling;Porous wall;Convective heat transfer;Heat transfer coefficient

摘要： 采用恒热流法 ,对 4种不同结构实验板的多斜孔气膜冷却壁表面换热系数进行了实验研究 ,研究的主要影响因素有 :吹风比、孔排列方式、孔间距和孔排距等 ,实验主流雷诺数约为 170 0 0 ,吹风比M =1～ 4。实验结果表明 :引入气膜冷却使表面换热系数明显增强 ;单一实验板换热随吹风比增大而增强 ;在相同单位面积开孔率情况下 ,列间距的影响大于排间距 ,即列间距越小换热越强。

关键词: 燃气涡轮发动机;薄膜冷却;多孔壁;对流传热;传热系数