The present invention discloses a lateral film wall cold structure for a turbine blade, used for cooling a turbine blade. Near the turbine blade internal cooling passage is arranged impingement cooling holes, through cold blade internal wall is arranged on the outer surface of the blade of the cold shock cooling; film cooling holes in the wall of the side wall and the air cooling cavity side wall surface of blade, the film cooling hole entrance is arranged on the wall surface and the side wall of the cold cavity with the cold wall cavity connected by cold gas cavity wall. In the gas film cooling holes because of the change of cooling airflow in the film hole near the film hole surface of the inferior wall, makes the film flow after attachment to the wall is stronger, the film cooling efficiency is greatly improved. The cooling gas after several heat transfer, first by the impact of cooling holes on blade surface of impingement cooling, then flows through the film cooling holes on blade internal cooling, finally in the blade is formed on the external surface of the cooling gas film cooling, high utilization efficiency, good cooling effect. The cold structure of gas film wall has the characteristics of simple structure and easy processing.
【技术实现步骤摘要】
一种用于涡轮叶片的侧向气膜壁冷结构
本专利技术涉及燃气轮机涡轮叶片的冷却技术,具体地说,涉及一种用于涡轮叶片的侧向气膜壁冷结构。技术背景燃气轮机广泛应用于航空器推进器,陆用、船用发电等各种工业用途。提高转子进口温度是改善燃气轮机发动机特性的关键技术,先进燃气轮机转子进口温度远比叶片材料的熔点高,因此涡轮叶片中需要先进的冷却技术。目前,涡轮叶片冷却中广泛采用冲击冷却、内部对流冷却和气膜冷却等冷却方式。冲击冷却是指低温气体通过冲击孔对叶片内部表面进行射流冲击。冷却气流冲击驻点区壁面上有很高的换热系数,因此可利用这种冷却方式进行重点冷却。内部对流冷却是指在叶片内部冷却气流经叶片内腔,通过对流换热吸收热量,从而达到降低叶片温度的目的。气膜冷却是指冷却气通过气膜孔流出,在叶片表面形成温度较低的冷气膜将壁面与高温燃气隔离,带走燃气的热量,从而起到对叶片的保护作用。目前,涡轮叶片气膜冷却中主要采用圆柱型气膜孔,上世纪八十年代,国外学者(Goldstein,R.J.,Eckert,E.R.G.,andBurggraf,F.1974,“EffectsofHoleGeometryandDensityonThree-DimensionalFilmCooling,”Int.JournalofHeat&MassTransfer,Vol.17,pp.595-607.)对圆柱型气膜孔内涡结构进行了分析研究,结果发现冷却气体从供气腔进入气膜孔时发生较大的气流转向,在气膜孔进口处气体弯管效应明显,在气膜孔内会形成较强的分离涡,从而影响气膜出流后的冷却效率。冲击冷却,内部冷却和气 ...
【技术保护点】
一种用于涡轮叶片的侧向气膜壁冷结构,包括冲击冷却孔、壁冷腔、气膜冷却孔,涡轮叶片壁厚为H,其特征在于:所述壁冷腔位于涡轮叶片壁内部;壁冷腔高度H
【技术特征摘要】
1.一种用于涡轮叶片的侧向气膜壁冷结构,包括冲击冷却孔、壁冷腔、气膜冷却孔,涡轮叶片壁厚为H,其特征在于:所述壁冷腔位于涡轮叶片壁内部;壁冷腔高度Hi的取值范围为0.4~0.6H,壁冷腔宽度W的取值范围为3~5mm;所述冲击冷却孔位于涡轮叶片内冷却通道与壁冷腔底面处,且冲击冷却孔垂直于冷气侧叶片壁面与壁冷腔相连通;冲击冷却孔直径Di的取值范围为0.2~0.3mm,冲击冷却孔长度Li的取值范围为0.2~0...
【专利技术属性】
技术研发人员:朱惠人,孟通,魏建生,
申请(专利权)人:西北工业大学,
类型:发明
国别省市:陕西,61
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