Numerical study on the influence of surface emissivity on radiative heat transfer distribution in turbine vane

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-09-04 DOI:10.1016/j.ijthermalsci.2025.110270

Meng Xian-long , Yin Ruo-pu , Zhu Ya-song , Liu Cun-liang

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Abstract

With the continuous increase in turbine inlet temperature, the significance of radiative heat transfer effects in the thermal protection of hot-end components has become increasingly prominent. Research has shown that both the magnitude of emissivity and its directional characteristics significantly impact radiative heat flux. However, the coupling mechanism between the complex surface geometry of turbine vanes and emissivity characteristics (including the magnitude of emissivity and directional emissivity) remains insufficiently explored. The objective of this study is to investigate the underlying mechanisms by which different emissivity magnitudes and directional emissivity characteristics affect the distribution of radiative heat flux on turbine vane surfaces. To support this analysis, the traditional Monte Carlo method is modified by incorporating directional emissivity models. This approach is expected to provide theoretical insights and numerical reference for the thermal protection design of turbine vanes under high-temperature conditions. The findings reveal that surface emissivity plays a critical role in governing radiative heat flux distribution on the vane surface by affecting both emission and absorption processes, exhibiting a near-linear increase trend. However, its influence on the overall heat flux distribution is minimal, with the leading-edge region demonstrating a stronger sensitivity to emissivity changes due to its unique geometric features and flow field distribution. On the other hand, directional emissivity has a significant impact on both the magnitude and the spatial distribution characteristics of the radiative heat flux.

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表面辐射率对涡轮叶片辐射换热分布影响的数值研究

随着涡轮进口温度的不断升高，辐射换热效应在热端部件热防护中的意义日益突出。研究表明，辐射率的大小及其方向特性对辐射热通量有显著影响。然而，涡轮叶片复杂的表面几何形状与发射率特性（包括发射率的大小和方向发射率）之间的耦合机制尚未得到充分的探讨。本研究的目的是探讨不同发射率大小和定向发射率特性影响涡轮叶片表面辐射热通量分布的潜在机制。为了支持这一分析，对传统的蒙特卡罗方法进行了改进，加入了定向发射率模型。该方法有望为高温条件下涡轮叶片热防护设计提供理论见解和数值参考。研究结果表明，表面发射率通过影响叶片表面的发射和吸收过程，对叶片表面的辐射热通量分布起着至关重要的作用，呈现出近线性的增加趋势。然而，它对整体热流密度分布的影响很小，由于其独特的几何特征和流场分布，前缘区域对发射率变化的敏感性更强。另一方面，方向发射率对辐射热通量的大小和空间分布特征都有显著的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.