Journal of energy storage最新文献

A practical state of health estimation method for lithium-ion batteries using charging duration in different voltage segments 基于不同电压段充电时间的锂离子电池健康状态评估方法

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117712

Guangfeng Wang, Changlong Li, Zhongrui Cui, Haitao Yuan, Naxin Cui

{"title":"A practical state of health estimation method for lithium-ion batteries using charging duration in different voltage segments","authors":"Guangfeng Wang, Changlong Li, Zhongrui Cui, Haitao Yuan, Naxin Cui","doi":"10.1016/j.est.2025.117712","DOIUrl":"10.1016/j.est.2025.117712","url":null,"abstract":"<div><div>Accurate state of health (SOH) estimation for lithium-ion batteries is essential for the safety and reliability of electric vehicles and energy storage system. However, the variability and unpredictability of actual charging voltage ranges limit the applicability of many existing methods. This study estimates SOH using a data-driven method that utilizes the charging duration of different voltage segments, making it applicable to a wide range of charging voltages. The whale optimization algorithm-optimized radial basis function neural network (WOA-RBFNN) is employed for SOH estimation. Five voltage segments with significantly changes due to battery aging are selected based on incremental capacity analysis (ICA), instead of directly selecting the charging duration of the voltage segments or the peaks and valleys from the incremental capacity curve (ICC). It is verified through ICA that the charging duration is proportional to the ICC’ envelope area, making it a suitable health indicator (HI) for each voltage segment. Then, the WOA-RBFNN is employed to construct the mapping between charging duration and SOH. The proposed method is validated using two representative datasets. The results demonstrate that the mean absolute error is below 0.589%, and the root mean square error is below 0.701%. The proposed method is applicable to a wide range of charging voltage, enhancing its practical usability.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117712"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Reduced graphene oxide/calcium alginate/polyethylene glycol composite phase change material with double-network structure for enhanced photothermal conversion 用于增强光热转化的还原氧化石墨烯/海藻酸钙/聚乙二醇复合相变材料

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117791

Peiyuan Li , Xinquan Zou , Yuwei Feng , Jiangfeng Luo , Shuolei Ma , Jianxiong Wang , Weihong Guo , Jikui Wang

{"title":"Reduced graphene oxide/calcium alginate/polyethylene glycol composite phase change material with double-network structure for enhanced photothermal conversion","authors":"Peiyuan Li , Xinquan Zou , Yuwei Feng , Jiangfeng Luo , Shuolei Ma , Jianxiong Wang , Weihong Guo , Jikui Wang","doi":"10.1016/j.est.2025.117791","DOIUrl":"10.1016/j.est.2025.117791","url":null,"abstract":"<div><div>Phase change materials (PCMs) are widely used in thermal energy storage and temperature regulation due to their ability to absorb and release latent heat during phase transitions. However, conventional PCMs often suffer from leakage and low thermal conductivity, which significantly limits their practical applications. Although polymer networks have been employed to encapsulate PCMs, challenges such as lack of functional modification, complex processing steps and high production costs still need to be resolved. We presented a strategy for synthesizing a double-network composite phase change material through the in situ self-assembly of graphene oxide (GO) within a sodium alginate (SA) matrix, combined with ionic crosslinking between SA and Ca<sup>2+</sup>, resulting in a reduced graphene oxide/calcium alginate/polyethylene glycol (RGO/CA/PEG) composite phase change material. CA imparted good dispersibility to RGO under the premise of effective encapsulation of PEG, and reduced the pressure of RGO encapsulation, resulting in a significant reduction in the preparation cost of the material. The results show that the RGO/CA/PEG has a high energy storage density (145.54 J/g) and can be maintained at 70 °C for 6 h without any leakage. Meanwhile, the construction of the RGO/CA double network enabled the PEG to have good thermal conductivity (127.78 % improvement over pure PEG) and photothermal conversion (85.54 %). The above studies show that the material has good application prospects for solar energy harvesting, battery thermal management, and thermal energy storage.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117791"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

The need for aging-aware control methods in lithium-ion batteries: A review 锂离子电池对老化感知控制方法的需求综述

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117653

Victor Vega–Garita , Mohsen Heydarzadeh , Amirhossein Hosseinzadeh Dadash , Eero Immonen

引用次数: 0

CFD assessment on thermal management behavior of lithium ion battery by employing phase change material and spiral fins 采用相变材料和螺旋翅片的锂离子电池热管理性能CFD评估

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117707

Juan Du, Shuao Jia, Xiangxiu Huang, Tao Xie, Lei Zhao, Yuxiang Hong

{"title":"CFD assessment on thermal management behavior of lithium ion battery by employing phase change material and spiral fins","authors":"Juan Du, Shuao Jia, Xiangxiu Huang, Tao Xie, Lei Zhao, Yuxiang Hong","doi":"10.1016/j.est.2025.117707","DOIUrl":"10.1016/j.est.2025.117707","url":null,"abstract":"<div><div>Boosting the heat transfer capability of phase change materials (PCM) is crucial for their application in the efficient thermal management of power batteries. One of the most prevalent enhancement methods is the use of fins. This paper innovatively presents a spiral fin-PCM design for the thermal management of 26650 batteries. The effects of fin numbers (<em>N</em>) and rotational angles (<em>θ</em>) on thermal performance were numerically scrutinized, with results compared to traditional straight fins. Key findings reveal that natural convection is crucial in battery heat dissipation. As <em>N</em> and <em>θ</em> escalate, the average integral value of the average velocity generally increases. Furthermore, spiral fins reduce the melting time by a maximum of 2 min compared to straight fins. The influence of the fin rotation angle on the transient heat absorption and power of PCM is relatively small, but it has a significant impact on the battery temperature uniformity. Compared to straight fins, coiled fins can reduce the platform temperature in the heat absorption process. Relative to the former, using <em>N</em> = 3 and <em>θ</em> = 180° can maximally reduce battery temperature by 2.7 °C.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117707"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 graphene oxide reduction: A multistep approach for enhanced electrochemical performance 优化氧化石墨烯还原：提高电化学性能的多步骤方法

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117780

Iman Sengupta , Madhav Prabhakar Chavhan , Suddhapalli S.S. Sharat Kumar , Sudipto Chakraborty , Somenath Ganguly

{"title":"Optimizing graphene oxide reduction: A multistep approach for enhanced electrochemical performance","authors":"Iman Sengupta , Madhav Prabhakar Chavhan , Suddhapalli S.S. Sharat Kumar , Sudipto Chakraborty , Somenath Ganguly","doi":"10.1016/j.est.2025.117780","DOIUrl":"10.1016/j.est.2025.117780","url":null,"abstract":"<div><div>The present work reduces graphene oxide (GO) using thermal, chemical, and a multistep method by combining both techniques. The effects of reduction methodologies on the structure and electrochemical performance of the reduced graphene oxide (rGO) specimens are investigated. The reduction methodology not only influences the carbon content and intercalation of carbon layers but also significantly affects the porosity features in terms of micro and mesopores, resulting in different electrochemical behaviours. Despite the high surface area of thermally reduced graphene oxide, the absence of micropores and high defect density hinder charge storage. Chemical reduction eliminates epoxy functionalities to partially restore the sp<sup>2</sup> network, promoting charge storage and transport. In contrast, the multistep reduction technique produces appreciable intercalation, eliminates functionalities such as epoxy and hydroxyl to restore the sp<sup>2</sup> network, and introduces significant micropores beneficial to improved charge storage. The specific capacitance of multistep-reduced graphene oxide is found to be five times greater than thermally reduced graphene oxide and two times greater than chemically reduced graphene oxide in a symmetric cell. Furthermore, such a multistep rGO type of cell provides excellent rate capability with stable cyclic performance and delivers a specific energy of 17 Wh kg<sup>−1</sup> at a specific power of 0.9 kW kg<sup>−1</sup>.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117780"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Impact of hydrogen storage on the characteristics and mechanical properties of trona deposits 储氢对氢离子沉积特征和力学性能的影响

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117806

Ehsan Dabbaghi , Kam Ng , Tyler C. Brown

{"title":"Impact of hydrogen storage on the characteristics and mechanical properties of trona deposits","authors":"Ehsan Dabbaghi , Kam Ng , Tyler C. Brown","doi":"10.1016/j.est.2025.117806","DOIUrl":"10.1016/j.est.2025.117806","url":null,"abstract":"<div><div>Underground hydrogen storage (UHS) represents a promising avenue for storing excess energy for future use. To ensure the safe implementation of this technology, it is crucial to evaluate the potential alterations hydrogen might induce in the host rock. This research studied the impact of hydrogen (H<sub>2</sub>) on the mechanical properties of trona rock collected from Sweetwater County, Wyoming, USA. Twelve cylindrical specimens were prepared: three with a diameter of 25 mm and nine with a diameter of 38 mm. Specimens underwent treatment with gas compositions of 50 %H<sub>2</sub> and 100 %H<sub>2</sub> over two weeks, under 4 MPa of pressure and at room temperature. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, and both uniaxial and triaxial compression tests were performed. Trona specimens treated with 50 %H<sub>2</sub> and 100 %H<sub>2</sub> exhibited, on average, 14 % and 33 % lower triaxial compressive strength, respectively, than that of untreated specimens. However, the elastic modulus of specimens treated with 50 %H<sub>2</sub> and 100 %H<sub>2</sub> increased by an average of 88 % and 166 %, respectively, compared to untreated specimens. This study shows that the rock's mechanical properties and microstructure are influenced by the reaction between H<sub>2</sub> and trona-related minerals.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117806"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Impact of battery ageing history on future degradation rates and capacity recovery effects in NMC 622 pouch cells 电池老化历史对NMC 622袋式电池未来降解率和容量恢复效果的影响

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117690

Johannes Rohwer , Frank Marken , Nico Didcock , Simon Erker , Wolfram Kohs , Helmut Grassberger , Christopher Vagg

{"title":"Impact of battery ageing history on future degradation rates and capacity recovery effects in NMC 622 pouch cells","authors":"Johannes Rohwer , Frank Marken , Nico Didcock , Simon Erker , Wolfram Kohs , Helmut Grassberger , Christopher Vagg","doi":"10.1016/j.est.2025.117690","DOIUrl":"10.1016/j.est.2025.117690","url":null,"abstract":"<div><div>Predicting the state of health (SoH) of Lithium-ion battery cells is essential for optimizing their utilization. Although electrochemical degradation models and data-driven approaches are promising for SoH estimation, they often rely on experiments with repeated idealized cycles and extended relaxation periods, leading to non-robust models for dynamic real-world conditions. This study presents a novel investigation on how different cycling sequences (ageing history) influence future degradation rates and SoH estimation. In a unique experimental design, four identical automotive-grade NMC pouch cells were initially subjected to different accelerated cycling conditions, followed by common protocols until the degradation curve passed its knee point. A detailed analysis was conducted on capacity evolution, swelling and apparent capacity fade. Results indicate that ageing history must be considered in SoH modelling, to achieve robustness under dynamic conditions and improve system safety. Under some conditions, the knee point onset was delayed by at least 50%, while in others, it did not occur at all. Additionally, reversible short-term capacity fade is strongly dependent on the cell’s state, with fresh cells exhibiting a drop of approximately 15% which gradually decreases to around 1% by the end of the test campaign. These findings highlight key considerations for transitioning from laboratory-based to real-world applicable SoH models. Finally swelling shows strong correlation with SoH (<span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> = 0.97), and is therefore a valuable alternative SoH indicator, especially in online in-service estimation techniques where controlled capacity checks under repeatable conditions are not available.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117690"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Mass production of ultralight graphene films by electrophoretic deposition to improve performance of lithium-ion and lithium-sulfur batteries 通过电泳沉积量产超轻石墨烯薄膜，以提高锂离子和锂硫电池的性能

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117865

Fei Li , Xiaojuan Liu , Mengting Wang , Yuxin Zhu , Chao Su , Tao Wei

{"title":"Mass production of ultralight graphene films by electrophoretic deposition to improve performance of lithium-ion and lithium-sulfur batteries","authors":"Fei Li , Xiaojuan Liu , Mengting Wang , Yuxin Zhu , Chao Su , Tao Wei","doi":"10.1016/j.est.2025.117865","DOIUrl":"10.1016/j.est.2025.117865","url":null,"abstract":"<div><div>Graphene films are promising to improve cycle performance and rate capability of LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> (LNMO) and lithium‑sulfur (Li<img>S) batteries. However, designing and fabricating ultralight and uniform graphene films directly on prepared electrodes or separators using simple, versatile, and high efficiency methods are still challenging. In this work, p-Phenylene diamine (pPD) reduced graphene oxide (pPD-rGO) films are deposited on the surface of LNMO electrode via electrophoretic deposition (EPD). The pPD-rGO modified LNMO electrode (LNMO/pPD-rGO), with the high LNMO loading (9 mg/cm<sup>2</sup>) and the ultralight pPD-rGO films loading (19 μg/cm<sup>2</sup>), remains 92.7 mAh/g with the capacity retention rate of 80.2 % after 1000th cycle at 1C. Moreover, a novel and unique EPD device is designed and assembled to present overlong and ultralight pPD-rGO and less defect graphene (LDG) films on commercial PP separators. The area density of pPD-rGO and LDG films are 17 and 100 μg/cm<sup>2</sup>, only accounting for 0.9 % and 5.5 % of PP separator weight, respectively. The pPD-rGO modified PP separator (PP/pPD-rGO) using in LNMO electrode enhances the capacity retention rate of 1000th cycles from 66.2 % to 80.6 %. The LDG modified PP separator (PP/LDG) using in high sulfur loading electrode (5 mg/cm<sup>2</sup>) not only exhibits the capacity retention rate of 81.1 % after 150th at 0.2C, but also can deliver reversible capacity of 738.9 mAh/g with the decay rate per cycle of 0.068 % after 250th cycle at 0.5C. All results show these ultralight graphene films on electrode or separator by EPD can effectively improve the performance of batteries due to reducing interface impedance. This work not only demonstrates the feasibility of the strategy of graphene films surface modification, but also proclaims the potential of EPD application prospect in high specific energy batteries.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117865"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Extracting health indicators from a single cycle of data based on the aging mechanism to accurately predict the knee point and remaining useful life of spent lithium-ion battery 基于老化机理的单周期数据提取健康指标，准确预测废锂离子电池的膝点和剩余使用寿命

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117813

Hongyu Chen , Bin Yuan , Qinan Lu , Basit Ali Shah , Renzong Hu , Hongmin Wu , Xuefeng Zhou , Qiying Han , Sen Li

{"title":"Extracting health indicators from a single cycle of data based on the aging mechanism to accurately predict the knee point and remaining useful life of spent lithium-ion battery","authors":"Hongyu Chen , Bin Yuan , Qinan Lu , Basit Ali Shah , Renzong Hu , Hongmin Wu , Xuefeng Zhou , Qiying Han , Sen Li","doi":"10.1016/j.est.2025.117813","DOIUrl":"10.1016/j.est.2025.117813","url":null,"abstract":"<div><div>Spent lithium-ion batteries will degrade quickly and unpredictably to failure after the knee point. Therefore, predicting the knee point is a key prerequisite to forecast the remaining useful life (RUL) for evaluating the reuse value of spent lithium-ion batteries (LIBs). Given the lack of historical data and the need for minimal testing time in the large-scale application scenarios of huge spent battery value assessments, this work proposes a feature engineering method based on battery aging mechanisms to identify health indicators (HIs). Furthermore, these HIs are used for the knee point and RUL prediction. The proposed method does not require historical data and can accurately predict the knee point and RUL using data from any one of cycle within the entire battery life cycles. Testing on two typical datasets with samples of Li(NiCoMn)O<sub>2</sub> and LiFePO<sub>4</sub> LIBs, the mean absolute error, MAE (mean absolute percentage error, MAPE) for predicting the knee point is only 47.15 cycles (10.60 %) and 13.63 cycles (6.38 %) in the two different datasets, respectively. The MAE (MAPE) reaches as low as 40.70 cycles (8.11 %) and 11.81 cycles (5.04 %) for the RUL prediction, respectively. The proposed method demonstrates excellent predictive accuracy and time-saving performance, and then a significant practical value.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117813"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effect of inlet circulation on energy consumption of outlet conduit of low-head pump system for pumped storage and its optimization 进口循环对抽水蓄能低扬程泵系统出口管道能耗的影响及优化

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-07-23 DOI: 10.1016/j.est.2025.117823

Tianxu Yan , Baoyun Qiu , Guipeng Qi , Chen Li , Jianping Yuan

{"title":"Effect of inlet circulation on energy consumption of outlet conduit of low-head pump system for pumped storage and its optimization","authors":"Tianxu Yan , Baoyun Qiu , Guipeng Qi , Chen Li , Jianping Yuan","doi":"10.1016/j.est.2025.117823","DOIUrl":"10.1016/j.est.2025.117823","url":null,"abstract":"<div><div>Many large low-head pump stations can operate in reverse and utilize upstream and downstream lakes and rivers for pumped storage. The hydraulic loss in the outlet conduit accounts for a significant proportion of the pump head, greatly affecting the pump system efficiency. To investigate the effect of inlet circulation distribution on the hydraulic loss of the outlet conduit and the overall pump system efficiency, numerical simulations were conducted to analyze the flow patterns and energy fields of an isometric circular pipe and a siphon outlet conduit. Applying dynamic mode decomposition (DMD), the evolutionary properties of entropy production in the circular pipe were examined under non-rotating flow, swirling flow, and secondary flow, respectively. By distributing circumferential velocity at the inlet, the hydraulic characteristics in the outlet conduit were quantified and analyzed. Additionally, the effect of the guide vane outlet angle on the internal flow and energy performance of the pump system was evaluated. The results reveal that a proper swirling flow can reduce entropy production, which was confirmed in the experiment. A high pump system efficiency is achieved when the guide vane outlet angle is 101°-99° from hub to shroud, with the flow deflection angle at the guide vane outlet of 4°-7°, which reduces flow separation on the guide vane, unfavorable flow patterns in the outlet conduit, and rotational kinetic energy losses in the outlet sump. In this way, the pump system efficiency was improved by 14.57 percentage points. The findings provide valuable insights for improving the efficiency of rotating machinery systems with guide vanes.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117823"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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