Comprehensive study on cooling effectiveness and thermoelectric conversion of a novel helium/hydrogen-based closed Brayton cooling system for a hydrogen aero-engine

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2025-03-01 Epub Date: 2025-02-05 DOI:10.1016/j.csite.2025.105741

Qiurui Xin , Xiaohui Bai , Helong Jin , Chengao Duan , Yuxi Li , Cunliang Liu

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Abstract

The Brayton cycle and thermoelectric generators offer significant potential for cooling hydrogen aero-engines. However, existing research on Brayton cooling schemes integrated with thermoelectric generators (TEGs) remains limited, typically relying on assumed state parameters that are challenging to obtain. This study proposes a one-dimensional method that considers the coupling relationships between the mainstream, TEGs, and coolant, thereby investigating the cooling and thermoelectric conversion processes of aero-engines under real operating conditions. Subsequently, four cooling schemes—direct cooling (DC), Brayton cooling (BC), direct thermoelectric cooling (DTC), and Brayton thermoelectric cooling (BTC)—are analyzed. Consequently, the DC provides the best cooling performance, with the highest wall temperature of hot components below 750 K. The BC generates the highest mechanical power, reaching 124.7 kW. Furthermore, the utilization of TEGs reduces the cooling efficiency but increases the total power output of the schemes. Compared to the DC, the maximum wall temperature of the DTC increases by 496.3 K, while the thermoelectric power is the greatest, reaching 116.6 kW. The maximum wall temperature of the BTC rises by 335.5 K compared to the BC, whereas its total power output is the highest, at 142.3 kW. This study guides the cooling and waste heat utilization in hydrogen aero-engines.

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氢能航空发动机用新型氦/氢基封闭布雷顿冷却系统的冷却效果及热电转换的综合研究

布雷顿循环和热电发电机为冷却氢航空发动机提供了巨大的潜力。然而，现有的研究与热电发电机（teg）集成的布雷顿冷却方案仍然有限，通常依赖于假定的状态参数，这些参数很难获得。本研究提出了一种一维的方法，考虑了主流、teg和冷却剂之间的耦合关系，从而研究了航空发动机在实际工况下的冷却和热电转换过程。随后，分析了四种冷却方案：直接冷却（DC）、布雷顿冷却（BC）、直接热电冷却（DTC）和布雷顿热电冷却（BTC）。因此，直流提供了最佳的冷却性能，热部件的最高壁温低于750 K。BC的机械功率最高，可达124.7 kW。此外，teg的使用降低了冷却效率，但增加了方案的总输出功率。与直流相比，DTC的最大壁温增加了496.3 K，而热电功率最大，达到116.6 kW。BTC的最高壁温比BC高335.5 K，而其总输出功率最高，为142.3 kW。本研究对氢能航空发动机的冷却和余热利用具有指导意义。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.