气膜孔堵塞对叶片吸力面气膜冷却的影响  

Effect of Hole Blockage on the Film Cooling Effectiveness of a Blade on the Suction Side

作　　者：郭云修 李广超 曾睿 张魏 朱建勇 GUO Yunxiu;LI Guangchao;ZENG Rui;ZHANG Wei;ZHU Jianyong(School of Aero engine,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学航空发动机学院,沈阳110136

出　　处：《动力工程学报》2021年第1期28-35,共8页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51406124);辽宁省教育厅优秀人才计划资助项目(LR2019050)。

摘　　要：为阐明热障涂层工艺造成的气膜孔堵塞对气膜冷却的影响机理,采用数值模拟方法研究了叶片吸力面在气膜孔堵塞比为0.2、0.5和0.8,吹风比为0.5、1.0、1.5和2.0时的气膜冷却效率变化。结果表明:堵塞比越大,气膜冷却效率下降幅度越明显,孔下游气膜覆盖面积越小;相比无堵塞情况,堵塞比为0.8时展向平均气膜冷却效率退化为51%~98%,堵塞比为0.5时展向平均气膜冷却效率退化为24%~86%,堵塞比为0.2时展向平均气膜冷却效率退化小于5%;中小堵塞比时气膜冷却效率受吹风比变化的影响明显,大堵塞比时气膜冷却效率受吹风比变化的影响较小;随着堵塞比的增大,孔内喉部区域冷气出流时动量增大,冷气射流得到抬升,使气膜贴附性大幅变差。To study the influence mechanism of hole blockage on the film cooling effectiveness caused in the spraying process of thermal barrier coatings, the change rule of film cooling effectiveness was numerically investigated at the blockage ratio of 0.2, 0.5 and 0.8 on the suction surface, and at the blowing ratio of 0.5, 1.0, 1.5 and 2.0. Results show that the larger the blockage ratio is, the more obvious the decrease will be in film cooling effectiveness, with smaller film coverage in the downstream of the hole. Compared with no blockage case, the average spanwise film cooling effectiveness reduces by 51%-98% when the blockage ratio is 0.8, which drops by 24%-86% when the blockage ratio is 0.5;for the blockage ratio of 0.2, the degradation of average spanwise film cooling effectiveness is less than 5%. The change of film cooling effectiveness at small and medium blockage ratio is obviously affected by the blowing ratio, while that at large blockage ratio is less affected. With the increase of blockage ratio, the momentum flux in the throat area of film cooling hole rises, resulting in smaller coverage of film due to the lifted coolant jet.

关 键 词：叶片 气膜孔 气膜冷却效率 堵塞比 吹风比 

分 类 号：TK47[动力工程及工程热物理—动力机械及工程]