Experimental and numerical investigation on subsonic film cooling performance with subregional strategy

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-09-29 DOI:10.1016/j.ijheatmasstransfer.2025.127882

Chenfeng Wang , Guoqing Li , Jialin Liu , Ruofan Wang , Yanfeng Zhang , Xingen Lu

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Abstract

Subsonic film cooling performance is investigated, applying an experimental research method as the main approach with numerical simulation supplemented. The linear turbine cascade experiment of film cooling is designed and arranged to validate the subregional strategy, which adds different compound angles to the film cooling holes based on the extents of secondary flow. The strategy is applied to four types of blade models and all cases of the experiment are conducted under subsonic conditions with a high-temperature difference, enabling the acquisition of both film cooling and aerodynamic data. The impact of subregional strategy on film cooling and aerodynamic performance is progressively analyzed with mechanisms gradually clarified. Film Cooling Effectiveness, Total Pressure Loss Coefficient and Isentropic Mach Number are selected and gathered as analyzing parameters. According to the results at design incidence, subregional strategy of film cooling is experimentally and numerically proved to improve Film Cooling Effectiveness in all cases, which also brings mass flow rate fluctuation in the coolant cavity. Less loss generation is confirmed in certain cases with subregional strategy. By suppressing the passage vortex and counter-rotating vortex separately, loss can be cut down while providing better film cooling on different positions of the blade surfaces.

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分区域策略下亚音速气膜冷却性能的实验与数值研究

以实验研究为主要手段，数值模拟为辅助手段，对亚音速薄膜冷却性能进行了研究。设计并布置了线性涡轮叶栅气膜冷却实验，验证了基于二次流程度在气膜冷却孔上增加不同复合角度的分区域策略。该策略应用于四种类型的叶片模型，并且所有实验案例都是在亚音速条件下进行的，具有高温差异，可以同时获取气膜冷却和气动数据。分区域策略对气膜冷却和气动性能的影响逐步分析，机理逐渐明确。选取气膜冷却效率、总压损失系数和等熵马赫数作为分析参数。根据设计发生率的结果，实验和数值验证了分区域气膜冷却策略在各种情况下都能提高气膜冷却效率，但同时也带来了冷却剂腔内质量流量的波动。在某些情况下，通过分区域战略确认损失较少。通过分别抑制通道涡和反旋转涡，可以减少损失，同时在叶片表面不同位置提供更好的气膜冷却。

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来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer