论文部分内容阅读
为了研究新型高效涡轮铸冷叶片内部冷却通道中的流动特性,以铸冷叶片典型结构——双层壳型冲击/气膜复合冷却结构的平壁模型为研究对象,实验研究了该种冷却结构的综合流量系数Cd随冲击雷诺数Red(600～2800),主次流吹风比M(0.7～7),冲击间距比H/d(0.5～1.25),冲击孔和气膜孔间距比P/d(0,3,4)等参数的变化规律。研究结果表明:(1)Cd随着冲击雷诺数Red,吹风比M的增加而增大,在吹风比小于3工况下更为显著;(2)在相同的气动参数条件下,综合流量系数Cd随着孔排距比P/d的增加而增大,随着冲击间距比H/d的减小而显著降低。
In order to study the flow characteristics of the cooling channels in the interior of a new type of highly efficient turbo-cooled cast-iron blade, the flat-walled model of the typical structure of cast-cooling blade, double-shell shell impingement / film composite cooling structure was studied. The total discharge coefficient Cd varies with the impact Reynolds number Red (600 ~ 2800), the primary and secondary blow ratio M (0.7 ~ 7), the impact pitch ratio H / d (0.5 ~ 1.25) (0,3,4) and other parameters of the law of change. The results show that: (1) Cd increases with impact Reynolds number Red and blower ratio M, and is more significant when blower ratio is less than 3. (2) Under the same aerodynamic parameters, the integrated flow coefficient Cd increases with the increase of pore-to-row ratio P / d, and decreases significantly with the decrease of impact pitch ratio H / d.