IF 9 1区工程技术

Energy Pub Date : 2025-03-26 DOI: 10.1016/j.energy.2025.135687

Liqi Hu, Shanshan Chen, Chengjie Zhang, Lijuan Zhou, Aijun Li

{"title":"Understanding the heterogeneous roles of China's sectors under the shock of second Trump administration's new tariffs: A novel method of shock-based input-output data envelopment analysis","authors":"Liqi Hu, Shanshan Chen, Chengjie Zhang, Lijuan Zhou, Aijun Li","doi":"10.1016/j.energy.2025.135687","DOIUrl":"10.1016/j.energy.2025.135687","url":null,"abstract":"<div><div>Existing studies on input-output analysis quantify losses resulting from new tariffs, but provide limited insight into identifying vulnerable sectors and regions. This study first integrates loss analysis with efficiency analysis, and is capable of assessing vulnerability. Methodologically, this study proposes a novel shock-based input-output DEA model and an extended input-output model. Furthermore, four coefficients are adopted to capture sectoral interconnections and loss propagation. Empirically, this study considers new tariffs possibly adopted by the second Trump administration on China. Our main conclusions are summarized below. Firstly, China's overall indirect losses significantly outweigh direct losses, with indirect losses being 3.6 times direct ones. Secondly, loss distribution displays pronounced heterogeneity across sectors and provinces. Electronic and Telecommunications Equipment sector experiences large direct (27.11 % of China's total) and indirect losses (18.90 % of total). Four eastern provinces (Guangdong, Jiangsu, Zhejiang and Shanghai) experience large indirect losses (69.05 % of total). Thirdly, energy industry belongs to a typical relatively supportive industry, with limited direct losses but large indirect losses. Finally, inefficiency sources vary much across industries and provinces. Particularly, Shanxi, Shandong, and Inner Mongolia exhibit significant potential for improving efficiency in energy industry. Consequently, policymakers should develop well-suited strategies to efficiently allocate limited resources, prioritizing recovery of vulnerable sectors and provinces.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"324 ","pages":"Article 135687"},"PeriodicalIF":9.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heat resistance analysis and performance improvement of an innovative micro heat pipe PV/T system

IF 9 1区工程技术

Energy Pub Date : 2025-03-26 DOI: 10.1016/j.energy.2025.135818

Rui Li , Panpan Zhai , Yadong Cao , Jinping Li , Juejie Zhu , Vojislav Novakovic

{"title":"Heat resistance analysis and performance improvement of an innovative micro heat pipe PV/T system","authors":"Rui Li , Panpan Zhai , Yadong Cao , Jinping Li , Juejie Zhu , Vojislav Novakovic","doi":"10.1016/j.energy.2025.135818","DOIUrl":"10.1016/j.energy.2025.135818","url":null,"abstract":"<div><div>Reducing heat resistance is an effective means to enhance the performance of photovoltaic/thermal (PV/T) systems. However, there is currently a lack of quantitative research on the heat resistance of PV/Ts, especially under outdoor conditions. To address this issue, experiments were conducted on typical days of spring, summer, autumn, winter in Lanzhou (36.1°N/103.9°E, 1517m), a city in northwest China. After determining the optimal tilt angle to be 45°, the heat resistance of each component of the PV/T panel (EVA, TPT, M − HP, heat conductive adhesive, airfoil fin heat exchanger, and the internal wall of the airfoil fin heat exchanger and water) was analyzed. The heat resistance for internal wall of airfoil fin heat exchanger wall and water was the highest among PV/T collector, reaching 49.05 %. In order to reduce this heat resistance, a rectangular heat exchanger was designed. The heat resistance for the internal wall of the rectangular heat exchanger and water was 31.0 % of the heat resistance for the internal wall of the airfoil fin heat exchanger and water. Numerical simulations have shown that the M-HP-PV/T system equipped with a rectangular heat exchanger has an overall efficiency improvement of 12.8 % compared to an airfoil fin heat exchanger.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135818"},"PeriodicalIF":9.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimizing thermal stress distribution in heat-pipe-cooled microreactors using multi-physics data-driven methods

IF 9 1区工程技术

Energy Pub Date : 2025-03-26 DOI: 10.1016/j.energy.2025.135679

Junda Zhang , Yinuo Chen , Xiaojing Liu , Xiang Chai , Hui He , Jinbiao Xiong , Tengfei Zhang

{"title":"Optimizing thermal stress distribution in heat-pipe-cooled microreactors using multi-physics data-driven methods","authors":"Junda Zhang , Yinuo Chen , Xiaojing Liu , Xiang Chai , Hui He , Jinbiao Xiong , Tengfei Zhang","doi":"10.1016/j.energy.2025.135679","DOIUrl":"10.1016/j.energy.2025.135679","url":null,"abstract":"<div><div>Heat-pipe-cooled microreactors represent cutting-edge nuclear energy systems, but they are faced with significant design challenges. The neutronic–thermal–mechanical interactions within these reactors are complex, and the excessive thermal stress in the core monolith threatens the structural integrity. We present an advanced multi-physics coupling method combining high-fidelity neutronic, thermal-hydraulic, and mechanical simulations. The model employs Monte Carlo neutron transport, finite element solid thermodynamics, and a heat pipe wall temperature model, coupled using Picard iteration. Leveraging this multi-physics coupling method, we have developed data-driven models utilizing artificial neural networks, which reduced each calculation time from 6 h to 4 min without sacrificing accuracy. To reduce the peak stress in the monolith, the non-dominated sorting genetic algorithm (NSGA-II) is applied to optimize key design parameters, such as fuel enrichment, active core height, and fuel rod pitch. An innovative heat-pipe-type optimization strategy was formulated, facilitating effective redistribution of core temperature and substantially reducing thermal stress without undermining key safety parameters or reactor performance. The optimization results showcased a 59% reduction in peak stress, with the maximum value decreasing to 68 MPa, thereby ensuring the stress levels remain within safe limits. This work suggests a viable solution for managing the thermal stress issues in heat-pipe-cooled microreactors.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135679"},"PeriodicalIF":9.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Review of the potential and challenges of MOF-based adsorption heat pumps for sustainable cooling and heating in the buildings

IF 9 1区工程技术

Energy Pub Date : 2025-03-26 DOI: 10.1016/j.energy.2025.135846

Jubair A. Shamim , Kashif Nawaz , Ming-Hsuan Hu , Paris Pasqualin , Easwaran N. Krishnan , Stephen P. Kowalski , Palash Kumar Bhowmik , Rajagopalan Parameshwaran , Wei-Lun Hsu , Yunho Hwang , Hirofumi Daiguji

{"title":"Review of the potential and challenges of MOF-based adsorption heat pumps for sustainable cooling and heating in the buildings","authors":"Jubair A. Shamim , Kashif Nawaz , Ming-Hsuan Hu , Paris Pasqualin , Easwaran N. Krishnan , Stephen P. Kowalski , Palash Kumar Bhowmik , Rajagopalan Parameshwaran , Wei-Lun Hsu , Yunho Hwang , Hirofumi Daiguji","doi":"10.1016/j.energy.2025.135846","DOIUrl":"10.1016/j.energy.2025.135846","url":null,"abstract":"<div><div>Heat pumps are regarded as the most suitable means to meet the future demand of heating and cooling in the building, as they require small input of electrical energy and output high thermal energy. Vapor compression heat pump (VCHP) and transcritical-CO<sub>2</sub> heat pump are the two major heat pump technologies currently dominating the market. However, VCHP system suffers from its fugitive emission of hydrofluorocarbon (HFC) refrigerants, and transcritical-CO<sub>2</sub> system requires high operating pressure (typically 9–13 MPa). For low-to-medium temperature heating and cooling applications thermally driven adsorption heat pump (AHP) provides a better alternative to VCHP and transcritical-CO<sub>2</sub> system as AHP uses natural refrigerants and operates at a much lower pressure. But currently available AHP technology has the limitation of low coefficient of performance (<em>COP)</em>. Advances in synthesizing metal-organic frameworks (MOF) with high gas adsorption capacity have created an opportunity to address the problem of low <em>COP</em> of current AHP technology. This article reviews the progress made in the past decade in utilizing MOF and conventional adsorbents with different working fluids in AHP technology and compares their performance. The article also summarizes the key challenges for the MOF-based AHP technology and provides the authors’ perspective to address these challenges.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135846"},"PeriodicalIF":9.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic performance of an integrated heat pump system coupled free cooling and waste heat recovery in data centers

IF 9 1区工程技术

Energy Pub Date : 2025-03-26 DOI: 10.1016/j.energy.2025.135838

Feng Zhou , Xuwen Tian , Yu Song , Guoyuan Ma

{"title":"Dynamic performance of an integrated heat pump system coupled free cooling and waste heat recovery in data centers","authors":"Feng Zhou , Xuwen Tian , Yu Song , Guoyuan Ma","doi":"10.1016/j.energy.2025.135838","DOIUrl":"10.1016/j.energy.2025.135838","url":null,"abstract":"<div><div>Recovering and reusing this waste heat for district heating is an effective strategy to enhance energy efficiency in data centers. To align data center waste heat recovery with heat consumer demand and improve energy utilization, a transient mathematical model of a data center-integrated heat pump district heating system was developed and validated. A case study involving a small data center with 300 standard racks in Beijing was conducted to analyze the system's operational and dynamic behavior. The results show that hot water and heating account for 35.70 % and 64.30 % of the total heat consumption, respectively. During the heating season, the heating heat pump unit exhibits a high heating coefficient of performance (COP), with a maximum heating COP of 5.27. Under year-round operation, the COP of the hot water heat pump unit exhibited periodic 24-h variations. Peak water consumption occurred from 6:00 to 9:00 and 21:00 to 24:00, with corresponding heating COP values of 3.87 and 4.24, respectively. The proposed system in addressing the cooling demand of the data center and the heating and hot water demands of the heat consumers, providing a feasible solution for improving the energy utilization efficiency of data centers.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135838"},"PeriodicalIF":9.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comparative study of radiant floor heating strategies for passive house in severely cold regions: A case study of Harbin

IF 9 1区工程技术

Energy Pub Date : 2025-03-26 DOI: 10.1016/j.energy.2025.135825

Xiaoni Gao , Yuchen Ji , Pengyuan Shen

{"title":"A comparative study of radiant floor heating strategies for passive house in severely cold regions: A case study of Harbin","authors":"Xiaoni Gao , Yuchen Ji , Pengyuan Shen","doi":"10.1016/j.energy.2025.135825","DOIUrl":"10.1016/j.energy.2025.135825","url":null,"abstract":"<div><div>This study explores the efficient heating strategy for passive houses in severely cold climates to improve the indoor thermal environment. Intermittent heating strategies based on indoor temperature to radiant floor heating system are applied and various heating methods under three heating strategies for passive houses are simulated. We proposed three metrics to rate the effectiveness of heating strategies: the indoor comfort rate (ICR), the physical comfort rate (PCR), and the thermal response coefficient (TRC), which are integrated to evaluate the performance of heating strategies comprehensively. It is shown that outdoor temperature fluctuation has little influence on the choice of heating strategy for passive houses. Furthermore, the short-interval heating strategy's ICR and PCR are above 90 %, and the TRC is above 0.2 h<sup>−1</sup>, demonstrating better performance than the continuous low temperature and long interval heating strategies. The results suggest the adoption of a short-interval heating mode for passive houses, with a suggested inlet water temperature of 60 °C and an indoor temperature control range of 22–26 °C. The study compares and analyzes three control strategies (continuous low-temperature heating, long interval heating, and short-interval heating), providing a reference for selecting appropriate heating strategies under different usage scenarios.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135825"},"PeriodicalIF":9.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative study on soot morphology and nanostructure characteristics of higher alcohol fuels and parent n-alkanes in co-flow diffusion flames

IF 9 1区工程技术

Energy Pub Date : 2025-03-25 DOI: 10.1016/j.energy.2025.135843

Yang Hua, Xingwei Xiang, Desong Gao, Liang Qiu, Yiming Zhang

{"title":"Comparative study on soot morphology and nanostructure characteristics of higher alcohol fuels and parent n-alkanes in co-flow diffusion flames","authors":"Yang Hua, Xingwei Xiang, Desong Gao, Liang Qiu, Yiming Zhang","doi":"10.1016/j.energy.2025.135843","DOIUrl":"10.1016/j.energy.2025.135843","url":null,"abstract":"<div><div>Higher-alcohols, as carbon-neutral energy, are more suitable alternative fuels for engines due to their higher reactivity and energy density. Compared to lower alcohols, higher alcohols exhibit alkane-like reactivity due to hydroxyl groups weakening. This work investigated the soot particle microevolution of n-C5-C8 alcohols and alkanes experimentally and numerically. As carbon chain increases, high-soot region exhibits a transition from flame center to wings, with the transition for alcohols occurring at C5-C6, later than alkanes (C2-C3). Flame height, soot concentration, particle size and nanostructure order all increase for C5-C8 alcohols and n-alkanes with increasing carbon. Moreover, the soot characteristic parameters of alcohols gradually approach those of n-alkanes. As carbon increases from 5 to 8, the particle size difference between alcohols and alkanes decreases from 4.3 nm to 3.2 nm. Kinetic analysis showed that the benzene (A1) yields in n-C5-C8 alcohols and n-alkanes increase with increasing carbon chain, but the A1 concentration of alcohols is smaller than that of n-alkanes, which attributed to the inhibition of C2-C3 intermediates of by alcoholic OH. However, the difference in A1 peak decreases with increasing carbon chain due to the transition from the inhibitory effect to promoting effect of hydroxyl groups on C4 intermediates.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135843"},"PeriodicalIF":9.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wide-load combustion characteristics of lean coal tangential preheating combustion

IF 9 1区工程技术

Energy Pub Date : 2025-03-25 DOI: 10.1016/j.energy.2025.135845

Shujun Zhu , Haoyang Zhou , Zhaoyang Li , Xiongwei Zeng , Ziqu Ouyang , Jicheng Hui , Jiangong Lin , Kun Su , Hongshuai Wang , Hongliang Ding , Qinggang Lyu

{"title":"Wide-load combustion characteristics of lean coal tangential preheating combustion","authors":"Shujun Zhu , Haoyang Zhou , Zhaoyang Li , Xiongwei Zeng , Ziqu Ouyang , Jicheng Hui , Jiangong Lin , Kun Su , Hongshuai Wang , Hongliang Ding , Qinggang Lyu","doi":"10.1016/j.energy.2025.135845","DOIUrl":"10.1016/j.energy.2025.135845","url":null,"abstract":"<div><div>In this study, the preheating combustion technology is applied to pulverized coal tangential combustion, which is a main combustion mode of large-capacity pulverized coal boilers. The tangential combustion characteristics of pulverized coal and preheated fuel are compared, and wide-load coupled combustion characteristics are explored. The results demonstrate that the preheated fuel exhibited enhanced ignition and more stable combustion performance, which was advantageous for achieving deep and flexible peak shaving. Tangential preheating combustion system could realize the stable operation of 19 %–100 % combustion load. Compared to traditional pulverized coal burners, retrofitting the single-layer nozzle into a pre-circulating fluidized bed (PCFB) reduced NO<sub><em>x</em></sub> emissions by about 28 % and increased combustion efficiency by approximately 1 %. Moreover, the stable coupled combustion of pulverized coal and preheated fuel confirmed the feasibility of retrofitting PCFB layers in coal-fired boilers with multi-layer nozzles. Additionally, reducing the combustion load lowered NO<sub><em>x</em></sub> emissions but slightly decreased combustion efficiency. Furthermore, the diagonal operation of PCFBs could be used as an operating mode under ultra-low loads. The study demonstrates the viability of integrating preheating combustion technology and pulverized coal tangential combustion, proposing a novel low-load operation mode with potential application in coal-fired power plants.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135845"},"PeriodicalIF":9.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

System dynamics simulation model of price transmission in collaboration market of electricity, carbon, and green certificate driven by multiple policies

IF 9 1区工程技术

Energy Pub Date : 2025-03-25 DOI: 10.1016/j.energy.2025.135852

Shuo Zhang , Zhenhao Xu , Yingzi Li , Jiayuan Zhang , Jiang Hu

{"title":"System dynamics simulation model of price transmission in collaboration market of electricity, carbon, and green certificate driven by multiple policies","authors":"Shuo Zhang , Zhenhao Xu , Yingzi Li , Jiayuan Zhang , Jiang Hu","doi":"10.1016/j.energy.2025.135852","DOIUrl":"10.1016/j.energy.2025.135852","url":null,"abstract":"<div><div>The new-type power system (NTPS) serves as the foundational support for constructing new-type energy system (NTES) and achieving dual carbon goals of China, within market-oriented operation driven by multiple policies. Based on the collaboration market of electricity, carbon and green certificate (CMECG), an orderly price transmission mechanism is the key issue for NPTS. In this paper, a system dynamics simulation model of price transmission in CMECG is proposed, driven by key multi-policy factors including green electricity consumption quota (GECQ), pre-allocation quota distribution ratios (PQDR) in the carbon market and offsetting ratios of Chinese certified emission reduction (ORCCER). Firstly, a collaborative operation framework of CMECG is constructed. Secondly, the causal loop diagrams and the flowchart for price transmission of CMECG are established. Finally, adopting the research path of China between 2025 and 2035, the collaborative operation processes of CMECG are simulated. The price transmission relationship of carbon and green certificates to electricity are separately fitted and sensitivity analyses are conducted. Relevant recommendations have been put forward to promote CMECG. The results show that the transmission of electricity price influenced by carbon price and green certificate follows linear and exponential relationships respectively, and that GECQ and PQDR have the most significant influence on carbon price, whereas the ORCCER has the most significant influence on green certificate price. The price transmission model of CMECG in NTPS based on system dynamics has obvious theoretical and practical significance for mechanism study of CMECG under multi-policies.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135852"},"PeriodicalIF":9.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the flow mechanisms in an axial fan with casing treatment at different Reynolds numbers

IF 9 1区工程技术

Energy Pub Date : 2025-03-25 DOI: 10.1016/j.energy.2025.135789

Jiangbin Zhao , Ziliang Li , Qiaodan Luo , Xingen Lu , Ge Han , Mingyang Wang

{"title":"Investigation of the flow mechanisms in an axial fan with casing treatment at different Reynolds numbers","authors":"Jiangbin Zhao , Ziliang Li , Qiaodan Luo , Xingen Lu , Ge Han , Mingyang Wang","doi":"10.1016/j.energy.2025.135789","DOIUrl":"10.1016/j.energy.2025.135789","url":null,"abstract":"<div><div>This study investigates the effects of Reynolds number (<span><math><mrow><mi>R</mi><mi>e</mi></mrow></math></span>) and axial slot casing treatment (ASCT) on the performance and internal flow mechanisms of a single-stage fan using a validated numerical method. The effect of <span><math><mrow><mi>R</mi><mi>e</mi></mrow></math></span> and ASCT on the performance of the fan are studied. A dimensionless loss analysis method based on the first law of thermodynamics is adopted to quantitatively assess the flow loss inside the fan. The results show that there are significant differences in the flow field and efficiency at different <span><math><mrow><mi>R</mi><mi>e</mi></mrow></math></span> due to differences in the boundary layer thickness and the spanwise separation degree. The difference between the boundary layer and secondary flow losses is the main reason for the efficiency discrepancy at different <span><math><mrow><mi>R</mi><mi>e</mi></mrow></math></span>. The thicker boundary layer at low <span><math><mrow><mi>R</mi><mi>e</mi></mrow></math></span> and the more severe secondary flow make the loss caused by the velocity gradient more significant. The broadening of the stall margin is attributed to the bleed and injection of the secondary flow caused by the recirculation of the ASCT. The ASCT has a significant effect on the inner loss of the rotor but no obvious effect on the stator. The source distribution of the loss is almost unaffected by the ASCT.</div></div>","PeriodicalId":11647,"journal":{"name":"Energy","volume":"323 ","pages":"Article 135789"},"PeriodicalIF":9.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energy最新文献