采用内横流供给结构的双射流气膜冷却的气动传热性能

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-09-23 DOI:10.1016/j.ijthermalsci.2025.110321

Shouzuo Li, Xiangyu Wang, Yishu Liu, Songtao Wang, Le Cai

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引用次数: 0

摘要

双射流气膜冷却结构被认为是一种有效的冷却涡轮热截面部件的方法。最近的研究强调了内部供应配置对外膜冷却的气动和热特性的重要影响。因此，本研究通过数值模拟的方法研究了带肋和不带肋两种横流条件下双射流气膜冷却孔的气动和换热性能。该研究考察了四种吹气比（M = 0.5至2.0）的正负交叉流供应方向，并使用空腔供应情况作为比较的基线。通过修改几何和气动边界条件，重点分析了不同供气配置下流场结构、气动损失和冷却性能的变化。结果表明，在低吹气比条件下，双喷气膜冷却孔受横流的影响较大。与空腔供电工况相比，横流工况下的流量系数降低了45.1%。不同的内横流供给形式表现出不同的最佳吹气比，当M≥2.0时，顺横流供给形式开始表现出冷却性能的优势。本研究强调了在高吹气比（M≥1.5）条件下，合理配置冷却结构（包括内部结构、供气方向和孔参数）对于大幅度提高气膜冷却性能的重要性。研究结果为双射流膜冷却配置提供了可操作的设计原则和性能优化指南。

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Aerodynamic and heat transfer performance of double-jet film cooling using internal crossflow supply configuration

The double-jet film-cooling structure is recognized as an effective method for cooling the hot-section parts of turbines. Recent studies highlight the significant impact of internal supply configurations on the aerodynamic and thermal characteristics of external film cooling. Therefore, this study investigates the aerodynamic and heat transfer performance of double-jet film-cooling holes under crossflow conditions, both with and without ribs, through numerical simulation. The study examines both positive and negative crossflow supply directions across four blowing ratios (ranging from M = 0.5 to 2.0), using a cavity supply case as the baseline for comparison. By modifying the geometric and aerodynamic boundary conditions, the focus is on analyzing the changes in the flow field structure, aerodynamic losses, and cooling performance across various supply configurations. The results reveal that at low blowing ratios, double-jet film-cooling holes are significantly affected by crossflow. Compared to the cavity supply case, the discharge coefficient in the crossflow cases decreases by up to 45.1 %. Different internal crossflow supply configurations exhibit distinct optimal blowing ratios, with the smooth crossflow supply configurations beginning to demonstrate advantages in cooling performance when M ≥ 2.0. This research emphasizes the importance of a rational configuration of the cooling structure—including the internal structure, supply direction, and hole parameters—for substantially enhancing film cooling performance under high blowing ratios (M ≥ 1.5). The findings deliver actionable design principles and performance optimization guidelines for double-jet film cooling configurations.

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.