Aerodynamic performance and over-expansion flow control of a supercritical CO2 co-rotating scroll expander for solid oxide fuel cell waste heat recovery

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-09-26 DOI:10.1016/j.tsep.2025.104146

Panpan Song , Ming Cheng , Zhenbo Lu , Dan Dan , Weilin Zhuge , Yangjun Zhang

{"title":"Aerodynamic performance and over-expansion flow control of a supercritical CO2 co-rotating scroll expander for solid oxide fuel cell waste heat recovery","authors":"Panpan Song , Ming Cheng , Zhenbo Lu , Dan Dan , Weilin Zhuge , Yangjun Zhang","doi":"10.1016/j.tsep.2025.104146","DOIUrl":null,"url":null,"abstract":"<div><div>The expander serves as the pivotal component within the waste heat recovery (WHR) power generation system. Compared to the Organic Rankine Cycle, the supercritical carbon dioxide (S-CO<sub>2</sub>) Brayton cycle is better suited for high-temperature WHR in solid oxide fuel cells (SOFCs). With the integrated development of WHR systems, the novel S-CO<sub>2</sub> co-rotating scroll expander (SCSE) holds significant potential for application in small-scale WHR due to its compact design and high energy conversion efficiency. Regrettably, research on SCSE remains limited, and its aerodynamic performance characteristics are still unknown. Consequently, this work combines CFD simulation with Taguchi-based grey correlation analysis to comprehensively evaluate the aerodynamic performance of the SCSE. The impact of key operational and structural parameters of the SCSE on the performance indices was quantified, and the parameter combinations corresponding to the optimal performance were identified. Additionally, an innovative and highly operable flow control strategy for asymmetric over-expansion is introduced, which is accomplished by reducing the ending angle of the scroll profile, resulting in a further increase of the specific power by 44.33 kW/kg and the isentropic efficiency by 2.22 %. This investigation facilitates the efficient and stable operation of the SCSE, which will establish a foundation for the development of a high-temperature WHR system of SOFCs.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104146"},"PeriodicalIF":5.4000,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermal Science and Engineering Progress","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2451904925009370","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}

引用次数: 0

Abstract

The expander serves as the pivotal component within the waste heat recovery (WHR) power generation system. Compared to the Organic Rankine Cycle, the supercritical carbon dioxide (S-CO₂) Brayton cycle is better suited for high-temperature WHR in solid oxide fuel cells (SOFCs). With the integrated development of WHR systems, the novel S-CO₂ co-rotating scroll expander (SCSE) holds significant potential for application in small-scale WHR due to its compact design and high energy conversion efficiency. Regrettably, research on SCSE remains limited, and its aerodynamic performance characteristics are still unknown. Consequently, this work combines CFD simulation with Taguchi-based grey correlation analysis to comprehensively evaluate the aerodynamic performance of the SCSE. The impact of key operational and structural parameters of the SCSE on the performance indices was quantified, and the parameter combinations corresponding to the optimal performance were identified. Additionally, an innovative and highly operable flow control strategy for asymmetric over-expansion is introduced, which is accomplished by reducing the ending angle of the scroll profile, resulting in a further increase of the specific power by 44.33 kW/kg and the isentropic efficiency by 2.22 %. This investigation facilitates the efficient and stable operation of the SCSE, which will establish a foundation for the development of a high-temperature WHR system of SOFCs.

查看原文本刊更多论文

固体氧化物燃料电池余热回收用超临界CO2同向旋转涡旋膨胀机气动性能及过膨胀流量控制

膨胀机是余热回收发电系统中的关键部件。与有机朗肯循环相比，超临界二氧化碳（S-CO2）布雷顿循环更适合固体氧化物燃料电池（sofc）的高温WHR。随着水冷堆系统的集成化发展，新型S-CO2同向旋转涡旋膨胀器（SCSE）由于其紧凑的设计和高能量转换效率，在小型水冷堆中具有巨大的应用潜力。遗憾的是，对超临界流体发动机的研究仍然有限，其气动性能特性仍然未知。因此，本工作将CFD模拟与基于田口的灰色关联分析相结合，对SCSE的气动性能进行综合评价。量化了SCSE关键运行参数和结构参数对性能指标的影响，确定了与最优性能相对应的参数组合。此外，还提出了一种创新的、高度可操作的非对称过膨胀流动控制策略，该策略通过减小涡旋型线结束角来实现，使比功率进一步提高44.33 kW/kg，等熵效率提高2.22%。本研究为超临界流体系统的高效、稳定运行奠定了基础，为高温超临界流体系统的发展奠定了基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.