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Cold start performance analysis of PEMFC with different assisted heating strategies

Case Studies in Thermal Engineering 2025年 71卷

作者： Wenhao Li Jianjun Yang Changqing Du Jie Zhao Qianqian Xin Fuwu Yan Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan China Hubei Research Center for New Energy and Intelligent Connected Vehicle Wuhan University of Technology Wuhan China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200 China

Large-scale use of proton exchange membrane fuel cell (PEMFC) is restricted by the challenge of cold start. A three-dimensional, transient, multiphase flow cold-start model is established to investigate the effects of different assisted heating strategies. The variations of ice volume fraction and temperature distribution of catalyst layer and their influences on cold start performance of PEMFC are discussed in detail, under coolant-assisted heating strategy, air-assisted heating strategy and the combination of two strategies at −20 °C. The results show that coolant-assisted heating strategy has significant effect on the cold start performance. There is an appropriate coolant flow velocity and heating power to balance cold start performance and energy consumption. Air-assisted heating strategy has minimal improvement on the cold start performance. Moreover, an interesting point is that on the basis of coolant-assisted heating adoption, the heat brought by the air-assisted heating although not much but can effectively improve water storage capacity of the ionomer. This makes the combination of two strategies has more excellent cold start performance, namely, catalyst layer's ice volume fraction decreases by 7.7 % and cold start time shortens by 2 s, compared to coolant-assisted heating, which provides valuable information for practical cold start strategy design of PEMFC.

关键词： Proton exchange membrane fuel cell Three-dimensional model Cold start Assisted heating strategy

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Low-cost biodegradable lead sequestration film for perovskite solar cells

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Journal of Energy Chemistry 2023年第9期84卷 311-320页

作者： Yiming Xiong Haoyu Cai Wang Yue Wenjian Shen Xuehao Zhu Juan Zhao Fuzhi Huang Yi-Bing Cheng Jie Zhong State Key Laboratory of Advanced Technology of Materials Composite Technology Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216GuangdongChina School of Automobile Engineering Wuhan University of TechnologyWuhan 430070HubeiChina

Despite the high efficiency that has been achieved for the perovskite solar cells(PSCs),the hazardous lead leakage from the perovskite absorber layer is one of the crucial barriers still hindering its penetration into the commercial market for a large-scale ***,we report a novel low-cost and biodegradable lead sequestration layer with high compatibility for up-scalable encapsulation of *** a precisely designed cross-linking reaction of chemical agents,the as-made biodegradable chitosan composite film shows enhanced mechanical strength,chemical stability,and lead adsorption *** designed encapsulation strategy reduces over 99.99% lead leakage to <2 ppb under varied simulations of weather conditions(hail,rain,or flood),which meet the safe level of drinking water set by the US Environmental Protection Agency(EPA).Moreover,the PSC efficiency is improved from 21.91% to22.82% due to the improved light absorption from the printed biodegradable lead absorption ***,we present a prototype process of accumulation and recycling of lead compounds in PSCs derbies via the biodegradation *** on the low-cost biodegradable lead sequestration film,this environmental-friendly encapsulation strategy could address the lead leakage issue for further commercialization of PSCs.

关键词： Lead sequestration Cross-linking Perovskite solar cells Biodegradable Recycling

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Panel Acoustic Contribution Analysis in Automotive Acoustics Using Discontinuous Isogeometric Boundary Element Method

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 2307-2330页

作者： Yi Sun Chihua Lu Zhien Liu Menglei Sun Hao Chen Hubei Key Laboratory of Advanced Technology for Automotive Components(Wuhan University of Technology) Wuhan430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan528200China

In automotive industries,panel acoustic contribution analysis(PACA)is used to investigate the contributions of the body panels to the acoustic pressure at a certain point of ***,PACA is implementedmostly by either experiment-based methods or traditional numerical ***,these schemes are effort-consuming and inefficient in solving engineering problems,thereby restraining the further development of PACA in automotive *** this work,we propose a PACA scheme using discontinuous isogeometric boundary element method(IGABEM)to build an easily implementable and efficient method to identify the relative acoustic contributions of each automotive body *** IGABEMis more accurate and converges faster than continuous BEM and IGABEM in the interior sound pressure evaluation of automotive *** this work,a contribution ratio is defined to estimate the relative acoustic contribution of the structure panels;it can be calculated by reusing the coefficient matrix that has already been generated in the sound pressure evaluation *** utilization of the parallel technique enables the proposed method to be more efficient than conventional methods;it is validated in two numerical examples,including a car passenger compartment subjected to realistic boundary conditions.A sound pressure response experiment based on a steel box is conducted to verify the accuracy of the interior sound pressure calculation using discontinuous *** work is expected to promote the practical process of IGABEM for application in automotive acoustic problems.

关键词： PACA IGABEM discontinuous element automotive acoustics

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One-dimensional convolutional neural network model driven intelligent operation phases identification of hydraulic press using energy data

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Engineering Applications of Artificial Intelligence 2025年 155卷

作者： Liu, Yanxiong Shu, Yuwen Xu, Zhicheng Han, Senbo Zhang, Changbang Chen, Mingzhang Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan University of Technology Wuhan430070 China National Energy Key Laboratory for New Hydrogen-ammonia Energy Technologies Foshan Xianhu Laboratory Foshan528200 China

Continuously monitoring the equipment's working condition is critical to control the quality variations of the stamping metal. In the conventional monitoring platform, numerous sensors are retrofitted to the hydraulic press to monitor its condition with the high cost and complexity. In contrast to the method of retrofitting the hydraulic press, in this work, we propose an intelligent monitoring system to effortlessly and accurately assess and determine the operation phases of hydraulic press machinery with minimal retrofitting. In this system, a one-dimensional convolutional neural network (1-DCNN) model was established to deeply mine the underlay information contained in the equipment's power consumption data to predict the working status. Subsequently, Bayesian hyperparameters optimization algorithm was adopted to systematically explore the best combination of structural parameters of the 1-DCNN model for better performance. Concurrently, sensitivity analysis of these hyperparameters was conducted to quantitatively ascertain their influence on the model performance. Furthermore, some machine learning (ML) models were compared to the proposed 1-DCNN model and this proposed intelligent monitoring system was implemented on the cloud-based server, ultimately, to achieve real-time classification of operation phases of the hydraulic press. The study results revealed that the kernel size of convolution layers can significantly influence the classification accuracy of the 1-DCNN model compared to other hyperparameters. Compared to these traditional ML models, the proposed 1-DCNN model performed better with a commendable classification accuracy of 98.89 % in predicting operation phases. With the leverage of the proposed system, accurate quantitative assessments of energy consumption of each operation phase of the targeted hydraulic press were achieved, thereby offering invaluable insights for the formulation of energy-saving strategies. © 2025 Elsevier Ltd

关键词： Hydraulic tools

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Phase-field lattice-Boltzmann study on fully coupled thermal-solute-convection dendrite growth of Al-Cu alloy

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China Foundry 2024年第2期21卷 125-136页

作者： Yin-qi Qiu Meng-wu Wu Xun-peng Qin Shou-mei Xiong Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000HubeiChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

Dendrite growth is a complex liquid-solid phase transition process involving multiple physical factors.A phase-field lattice-Boltzmann method was developed to simulate the two-and three-dimension dendrite growth of Al-Cu *** effect of fully coupled thermal-solute-convection interaction on the dendrite growth was investigated by incorporating a parallel-adaptive mesh refinement algorithm into the numerical *** accurately reproducing the latent heat release,solute diffusion and convective transport behaviors at the liquidsolid interface,the interaction mechanism among thermal-solute-convection transport as well as their coupling effects on the dendrite growth dynamics were *** simulation results show that the release of latent heat slows down the dendrite growth rate,and both natural and forced convection disrupt the symmetrical growth of *** combination makes the growth of dendrites more complex,capturing important physical aspects such as recalescence,dendrite tip splitting,dendrite tilting,dendrite remelting,and solute plume in the simulation *** on the robustness and powerful ability of the numerical model,the formation mechanisms of these physical aspects were revealed.

关键词： simulation phase field dendrite growth thermal-solute-convection interaction

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Analysis and prediction of surface roughness for robotic belt grinding of complex blade considering coexistence of elastic deformation and varying curvature

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Science China(Technological Sciences) 2021年第5期64卷 957-970页

作者： XU XiaoHu YE SongTao YANG ZeYuan YAN SiJie ZHU DaHu DING Han State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China

Precision prediction of machined surface roughness is challenging facing the robotic belt grinding of complex blade,since this process is accompanied by significant elastic *** resulting poor prediction accuracy,to a great extent,is attributed to the existing prediction model which less considers the *** this paper,an improved scallop height model is developed to predict and assess the machined surface roughness by taking into account the elastic deformation and the varying curvature of blade,then robotic belt grinding experiments are carried out to evaluate the proposed model from the perspective of surface *** factors that influence the scallop height are analyzed,and the suitable empirical equation of surface roughness is proposed to assess and predict the surface quality from the aspect of blade concave and convex surface by adopting the constant scallop height machining.

关键词： robotic belt grinding scallop height elastic deformation surface roughness prediction

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Tribological Performance Improvement of Bearing Steel GCr15 by an Alternating Magnetic Treatment

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Acta Metallurgica Sinica(English Letters) 2017年第10期30卷 957-964页

作者： Yan-Li Song Cheng Yu Xia Miao Xing-Hui Han Dong-Sheng Qian Xu Chen Hubei Key Laboratory of Advanced Technology of Automotive Parts Wuhan University of Technology Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology School of Materials Science and Engineering Wuhan University of Technology

This paper discusses the tribological performance of the bearing steel GCr15 treated by an alternating magnetic field. The wear test results showed that the average of wear mass losses decreased by nearly 80% after the magnetic treatment, compared to those before the magnetic treatment. The micro-hardness and microstructures（i.e., grain size,carbide morphology and dislocation distribution） before and after the magnetic treatment were experimentally investigated,and the mechanism of the tribological performance improvement of the bearing steel GCr15 due to the magnetic treatment was then revealed based on the above results.

关键词： Tribological performance Magnetic treatment Bearing steel

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Modelling and analysis of metal flowing behaviors in constraining ring rolling of tapered ring with thin wall and three high ribs

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Chinese Journal of Aeronautics 2023年第6期36卷 476-492页

作者： Lin HUA Duanyang TIAN Xinghui HAN Wuhao ZHUANG Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China

Tapered ring with thin wall and three high ribs(TRTWTHR),showing complicated geometry(wall thickness is less than 4 mm and rib height exceeds 20 mm),is extensively utilized to fabricate the critical structural parts of aerospace equipment such as spacecraft cabin,rocket body and fuel tank because of light weight and high carrying *** to fabricate TRTWTHR with high performance is a critical problem that aerospace area needs to *** this work,constraining ring rolling(CRR)technique is first adopted to form *** metal streamlines(UMS)and uncoordinated growth of three ribs easily occur in CRR of TRTWTHR,which makes the forming quality of TRTWTHR difficult to be *** with this difficulty,an analytical model that can predict UMS and the height of three ribs in CRR of TRTWTHR is established so as to guide the process design of ***,the reliability of the established analytical model and the feasibility of CRR of TRTWTHR are confirmed by FE simulation and ***,using the established analytical model,the window of UMS occurring relevant to the tapered angle of TRTWTHR and the location of the rib of middle end is ***,three uncoordinated growth modes among three ribs are found when the width of three ribs is identical and UMS do not occur,and the mechanisms of three uncoordinated growth modes are revealed.

关键词： Analytical model Constraining ring rolling Growth of three ribs Metal streamlines Tapered ring with thin wall and three high ribs

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In-situ defect passivation assisted three-step printing of efficient and stable formamidine-lead bromide solar cells

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Journal of Energy Chemistry 2024年第9期96卷 396-405页

作者： Hang Yang Tao Zhou Haoyu Cai Wenjian Shen Hao Chen Yongjun Liu Juan Zhao Yi-Bing Cheng Jie Zhong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216GuangdongChina School of Automobile Engineering Wuhan University of TechnologyWuhan 430070HubeiChina

Perovskite solar cells(PSCs)emerge as the most promising photovoltaics(PV)for their high performance and potential convenient cost-effective production routes comparing to the sophomore PV *** printed PSCs with simplified device architecture and fabrication procedures could further enhance the competitive strength of PSC *** this work,we present an in-situ defect passivation(ISDP)assisted full-printing of high performance formamidine-lead bromide(FAPbBr_(3))*** three rapid printing steps are involved for electron transporting layer(ETL),perovskite and carbon to form a complete solar cell on the low-cost fluorine-doped tin oxide(FTO)***-chain polymer monomethyl ether polyethylene glycol is particularly utilized as the ISDP passivator,leading to conformal coating on the rough FTO and defect passivation for both ETL and perovskite during printing.A high efficiency of 10.85%(certified 10.14%)and a high V_(oc)up to 1.57 V are achieved for the printed *** unencapsulated PSCs maintain above 90%of the initial efficiency after continuously heating at 85℃for 1000 h and over 80%of the efficiency after the maximum power point tracking for 3500 *** fully printed semitransparent PSCs with carbon grids(CGs)show average visible light transmittance over 33%and an efficiency of 8.81%.

关键词： Formamidinium lead bromide Fully printed Lowcosts Carbon electrode Semitransparent

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Effect of Mn addition on microstructure and mechanical properties of GX40CrNiSi25-12 austenitic heat resistant steel

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China Foundry 2024年第3期21卷 205-212页

作者： Guan-yu Jiang Meng-wu Wu Xiao-guang Yang Hui Wang Yu-yuan Zhu Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 441000HubeiChina Wescast Industries(China)Co. Ltd.Wuhan 430100China

Three types of steels were designed on the basis of GX40CrNiSi25-12 austenitic heat resistant steel by adding different Mn contents(2wt.%,6wt.%,and 12wt.%).Thermodynamic calculation,microstructure characterization and mechanical property tests were conducted to investigate the effect of Mn addition on the microstructure and mechanical properties of the austenitic heat resistant *** show that the matrix structure in all the three types of steels at room temperature is completely *** NbC and M_(23)C_(6)precipitate at grain boundaries of austenite *** the increase of Mn content,the number of carbides increases and their distribution becomes more *** the Mn content increases from 1.99%to 12.06%,the ultimate tensile strength,yield strength and elongation increase by 14.6%,8.0%and 46.3%,*** improvement of the mechanical properties of austenitic steels can be explained by utilizing classic theories of alloy strengthening,including solid solution strengthening,precipitation strengthening,and grain *** increase in alloy strength can be attributed to solid solution strengthening and precipitation strengthening caused by the addition of *** improvement of the plasticity of austenitic steels can be explained from two aspects:grain refinement and homogenization of precipitated phases.

关键词： austenitic heat resistant steel manganese microstructure mechanical properties

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