多管汽车热电发电机传热和发电性能的数值模拟

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-04-07 DOI:10.1016/j.csite.2025.106091

Xiao-bi Wang , Jin-liang Zeng , Xun Liu , Chu-qi Su , Xin Xiong , Yi-Ping Wang

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引用次数: 0

摘要

为了提高汽车尾气热电发电机的性能，本文对带有多管热交换器的汽车尾气热电发电机进行了数值评估。分析了不同几何结构的波纹管中复杂流动状态对设备传热和发电的影响。计算考虑了不同的废气质量流量、传热效率以及基于发电量和发电效率的熵变。结果表明，增加波纹管的高径比有利于流体的强度，如二次流。波纹环距离的增加有利于扩大二次流等流体的影响范围。当废气流速为 10-30 g/s 时，与光滑管相比，这些变化可提高传热和传热效率，但同时管内的摩擦阻力也会增加。发电效率提高到 1.2-2 倍，最大输出功率为 120W，为优化热电发电机提供了数据支持。

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Numerical simulation of a multi-tube automotive thermoelectric generator for heat transfer and power generation performance

To improve the performance of automotive exhaust thermoelectric generators, a numerical evaluation of automotive exhaust gas thermoelectric generators with multi-tube heat exchangers is carried out in this paper. The influence of complex flow states in corrugated tubes with different geometric structures on the device's heat transfer and power generation is analyzed. The calculation considers different mass flow rates of exhaust gas, heat transfer efficiency and entropy change based on power generation output and power generation efficiency. The results show that the increase of the height-diameter ratio of the corrugated tube is beneficial to the strength of the fluid such as the secondary flow. The rise in distance of the corrugated ring is encouraged to increase the influence range of the fluid such as the secondary flow. When the exhaust gas flow rate is 10–30 g/s, these changes can enhance the heat transfer and heat transfer efficiency compared with the smooth tube, but at the same time, the frictional resistance inside the tube will also increase. The power generation efficiency is increased to 1.2–2 times, and the maximum output power is 120W, which provides data support for optimising thermoelectric generators.

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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.