Numerical analysis of infrared radiation intensity of two-dimensional convergent divergent exhaust system considering the effects of multiple components

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-11-23 DOI:10.1016/j.ijthermalsci.2024.109567

Shengwen Hou, Qiang Wang, Haiyang Hu, Jifeng Huang, Shixiong Liu

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引用次数: 0

Abstract

With the development of computer technology, coupled simulation of multiple components has gradually gained attention. This paper focuses on an integrated model consisting of turbine, afterburner, and two-dimensional convergent divergent (2D-CD) nozzle. The multi-scale multi-group wideband k-distribution model (MSMGWB) was employed to calculate spectral transmittance, and wall emissivity was determined through experiments. The paper quantitatively analyzes the difference in infrared radiation (IR) intensity obtained from traditional computational methods compared to the integrated model, investigates the impact of turbine outlet swirl flow on infrared characteristics, and finally reveals the effects of low-emissivity coatings and turbine cooling on the infrared intensity of the integrated model. The results show that the turbine and afterburner have significant influence on the infrared characteristics of the exhaust system, which can't be ignored in the study. When the turbine is ignored, the IR intensity decreases by up to 8.7 % under swirl flow condition, while the IR intensity decreases by up to 9.7 % without swirl flow condition. If the infrared characteristics of turbine and afterburner are ignored, the IR intensity can decrease by 22.1 % at most and increase by 412.4 % at most. Cooling measures for turbine blades can significantly reduce the infrared intensity. When the turbine temperature is reduced by 240 K, the infrared intensity decreases by up to 28.4 %. Low emissivity measure for turbine structure has limited influence on infrared intensity. Applying low-emissivity measures to the afterburner high-temperature walls, the infrared radiation intensity can be reduced by up to 34.2 %. By combining all the effective infrared suppression measures mentioned above, the infrared intensity of the integrated model can be reduced by up to 53.1 %.

查看原文本刊更多论文

考虑多组件影响的二维会聚发散排气系统红外辐射强度数值分析

随着计算机技术的发展，多组件耦合仿真逐渐受到重视。本文主要研究由涡轮、后燃烧器和二维会聚发散（2D-CD）喷嘴组成的集成模型。采用多尺度多组宽带 k 分布模型（MSMGWB）计算光谱透射率，并通过实验确定壁面发射率。论文定量分析了传统计算方法得到的红外辐射（IR）强度与集成模型的差异，研究了涡轮出口漩涡流对红外特性的影响，最后揭示了低辐射涂层和涡轮冷却对集成模型红外强度的影响。研究结果表明，涡轮和后燃烧器对排气系统的红外特性有着不可忽视的重要影响。当忽略涡轮时，在漩涡流条件下红外强度最多降低 8.7%，而在无漩涡流条件下红外强度最多降低 9.7%。如果忽略涡轮和后燃烧器的红外特性，红外强度最多可降低 22.1%，最多可增加 412.4%。涡轮叶片冷却措施可显著降低红外强度。当涡轮温度降低 240 K 时，红外强度最多可降低 28.4 %。涡轮机结构的低发射率措施对红外线强度的影响有限。对后燃烧器高温壁采用低发射率措施，红外辐射强度最多可降低 34.2%。综合上述所有有效的红外线抑制措施，综合模型的红外线强度最多可降低 53.1%。

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.