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Investigation on film cooling and aerodynamic performance of blade tip with tangential jet cooling scheme at transonic flow

机译:跨型流动流动切向喷射冷却方案叶片尖端薄膜冷却和空气动力学性能研究

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摘要

An innovative blade tip cooling system is proposed in the current paper. The aerothermal characteristics of the blade tip with the tangential jet cooling scheme are investigated using the Pressure Sensitive Paint (PSP) technique under transonic flow conditions. The experiment is carried out at tip clearance gaps of 0.7% and 1.5% and four mass flow ratios. The cascade inlet Reynolds number and cascade exit Mach number are 370000 and 1.05, respectively. The computational fluid dynamics method was used to analyze the flow characteristics of the blade tip. The bottom wall of the tip cavity downstream of the tangential jet cooling scheme is completely covered by the secondary flow. With the mass flow ratio (MFR) increasing, the film cooling effectiveness (eta) of the whole blade tip surface is improved. The small tip clearance gap shrinks the low eta region in the mid-chord cavity near the suction-side. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译:本纸上提出了一种创新的刀片尖端冷却系统。 使用压敏涂料(PSP)技术在跨音质流动条件下采用压敏涂料(PSP)技术来研究叶片尖端的叶片尖端的空气特性。 实验在尖端间隙下进行0.7%和1.5%和四种质量流量比。 级联入口雷诺数和级联出口马赫数分别为370000和1.05。 计算流体动力学方法用于分析叶片尖端的流动特性。 切向射流冷却方案下游的尖端腔的底壁完全被二次流动覆盖。 随着质量流量比(MFR)的增加,整个叶片尖端表面的膜冷却效果(ETA)得到改善。 小尖端间隙差距缩小了在吸入侧的中间弦腔中的低ETA区域。 (c)2021 Elsevier Masson SAS。 版权所有。

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