带月牙形挡块的圆柱孔在涡轮叶片上的气膜冷却性能  

Film cooling performance of a cylindrical hole with a crescent-shaped block on turbine blade pressure and suction sides

作　　者：白伟 张鹏飞 张超[1,2] BAI Wei;ZHANG Pengfei;ZHANG Chao(Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control,Tianjin University of Technology,Tianjin 300384,China;National Demonstration Center for Experimental Mechanical and Electrical Engineering Education,Tianjin University of Technology,Tianjin 300384,China;Deepinfar Ocean Technology Inc.,Tianjin 300457,China)

机构地区：[1]天津理工大学天津市先进机电系统设计与智能控制重点实验室,天津300384 [2]天津理工大学机电工程国家级实验教学示范中心,天津300384 [3]深之蓝海洋科技股份有限公司,天津300457

出　　处：《天津理工大学学报》2024年第6期8-14,共7页Journal of Tianjin University of Technology

基　　金：国家自然科学基金(51976139)。

摘　　要：气膜冷却被广泛用于降低燃气轮机叶片的热负荷。近年来,在圆柱孔的下游放置一个月牙形挡块以提高冷却效率的冷却方式引起了部分学者的关注,并且在平板气膜冷却中进行了验证。文中通过计算流体力学方法进一步研究了下游挡块在平面叶栅中的冷却性能,考虑了叶片压力面和吸力面每个面上不同的两个位置。经过实验数据验证后,选择基于剪切应力模型的湍流模型来使方程封闭。结果表明,无论是压力面还是吸力面的月牙形挡块,与没有块体的情况相比,都提高了冷却性能并有着更高的气动损失,且在高吹风比下更加突出了其冷却性能的优越性。更广的冷气扩散和更高的冷却效率归因于阻塞效应产生的额外反肾形涡对。冷却性能和气动损失对冷却孔的具体位置很敏感,当冷却孔位于压力面时,冷却性能高于吸力面,气动损失较低。Film cooling is widely used to reduce the thermal load of gas turbine blades.In recent years,placing a crescent-shaped block downstream of the cylindrical hole has been proposed to enhance cooling effectiveness and has already been validated in flat-plate film cooling.The current work further studies the cooling performance of a linear cascade via the computational fluid dynamics method.Each different two locations located at blade pressure and suction sides are considered.The shear stress model based is selected as the turbulence model closure after verification by the published experimental data.The results show that the crescent-shaped block on either pressure or suction side improves cooling performance and a higher aerodynamic loss compared with no block case.The superiority of cooling performance enhancement is highlighted at a high blowing ratio of 1.5.The wider coolant spreading and higher cooling effectiveness are attributed to the additional anti-kidney-shaped vortex pair from the obstruction effect.The cooling performance and aerodynamic loss are sensitive to the specific location of the cooling hole.When the cooling hole is located on the pressure side,the cooling performance is higher than that on the suction side,and the aerodynamic loss is lower.

关 键 词：燃气轮机 气膜冷却 月牙形挡块 平面叶栅 冷却效率 气动损失 

分 类 号：TG155[金属学及工艺—热处理]