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Thermodynamic Performance Analysis of E/F/H-Class Gas Turbine Combined Cycle with Exhaust Gas Recirculation and Inlet/Variable Guide Vane Adjustment under Part-Load Conditions

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Journal of Thermal Science 2024年第1期33卷 348-367页

作者： LI Keying CHI Jinling WANG Bo zhang shijie Key Lab of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Mechanical Electronic&Information Engineering China University of Mining&Technology-BeijingBeijing 100083China

Exhaust gas recirculation control(EGRC),an inlet air heating technology,can be utilized in combination with inlet/variable guide vane control(IGV/VGVC) and fuel flow control(FFC) to regulate the load,thereby effectively improving the part-load(i.e.,off-design) performance of the gas turbine combined cycle(GTCC).In this study,the E-,F-,and H-Class EGR-GTCC design and off-design system models were established and validated to perform a comparative analysis of the part-load performance under the EGR-IGV-FFC and conventional IGV-FFC strategies in the E/F/H-Class *** show that EGR-IGV-FFC has considerable potential for the part-load performance enhancement and can show a higher combined cycle efficiency than IGV-FFC in the E-,F-,and H-Class ***,the part-load performance improvement in the corresponding GTCC was weakened for the higher class of the gas turbine because of the narrower load range of EGR action and the deterioration of the gas turbine ***,EGR-IGV-FFC was inferior to IGV-FFC in improving the performance at loads below 50% for the H-Class *** results obtained in this paper could help guide the application of EGR-IGV-FFC to enhance the part-load performance of various classes of GTCC systems.

关键词： E/F/H-Class gas turbine combined cycle performance improvement part-load conditions exhaust gas recirculation inlet/variable guide vane

Multi‐feature fusion and memory‐based mobile robot target tracking system

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IET Cyber-Systems and Robotics 2024年第3期6卷 62-73页

作者： Hanqing Sun shijie zhang Qingle Quan College of Information Engineering Henan University of Animal Husbandry and EconomyZhengzhouHenanChina College of Information Technology and Computer Science University of the CordillerasBaguioPhilippines College of Electrical Engineering Henan University of TechnologyZhengzhouHenanChina

In crowded settings,mobile robots face challenges like target disappearance and occlusion,impacting tracking *** existing optimisations,tracking in complex environments remains *** address this issue,the authors propose a tailored visual navigation tracking system for crowded *** target disappearance,an autonomous navigation strategy based on target coordinates,utilising a path memory bank for intelligent search and re‐tracking is *** significantly enhances tracking *** handle target occlusion,the system relies on appearance features extracted by a target detection network and a feature memory bank for enhanced *** control technology ensures robust target tracking by fully utilising appearance information and motion characteristics,even in occluded *** testing on the OTB100 dataset validates the system's effectiveness in addressing target tracking challenges in diverse crowded environments,affirming algorithm robustness.

关键词： autonomous navigation Kalman filtering memory bank mobile robots proportional‐integral‐derivative

Regulation of the pore structure of carbon nanosheets based electrocatalyst for efficient polysulfides phase conversions

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Journal of Materials Science & Technology 2024年第4期171卷 37-46页

作者： Xiaoyang Liu Jingbo zhang Kangli Liu shijie zhang Rouhan Hou Xiaoyi Hu Peng zhang Guosheng Shao State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) Xingyang 450100China

The practical applications of lithium-sulfur(Li-S)batteries are hampered by the sluggish redox kinetics and polysulfides shuttle in the cyclic process,which leads to a series of problems including the loss of active materials and poor cycling *** this paper,the pore structures of carbon nanosheets based electrocatalysts were precisely controlled by regulating the content of water-soluble KCl *** relationship between pore structures and Li-S electrochemical behavior was studied,which demonstrates a key influence of pore structure in polysulfides phase *** the liquid-sloid redox reaction of polysulfides,the micropores and small mesopores(d20 nm)and macropores played a decisive *** a typical exhibition,the nickel-embedded carbon nanosheets(Ni-CNS)with a high content of large mesopores and macropores can aid Li-S batteries in exhibiting stable cycling performance(760.1 mAh g^(-1)at 1 C after 300 cycles)and superior rate capac-ity(847.8 mAh g^(-1)at 2 C).Furthermore,even with high sulfur loading(8 mg cm^(−2))and low electrolyte(E/S is around 6μL mg^(-1)),the high area capacity of 7.7 mAh cm^(−2)at 0.05 C could be *** work can provide a guideline for the design of the pore structure of carbon-based electrocatalysts toward high-efficiency sulfur species redox reactions,and afford a general,controllable,and simple approach to constructing high performance Li-S batteries.

关键词： Hierarchical porous carbon network Electrocatalyst Molten salt templating method Modified separators Li-S batteries

A functional gel polymer electrolyte based on PVDF-HFP/gelatin toward dendrite-free lithium metal batteries

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Nano Research 2024年第4期17卷 2790-2799页

作者： Xiaoyi Hu Kangli Liu shijie zhang Guosheng Shao S.Ravi P.Silva Peng zhang State Center for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) ZhongyuanzhiguXingyang 450100China Nanoelectronics Center Advanced Technology InstituteUniversity of SurreyGuildfordGU27XHUK

The leakage of liquid electrolyte and the formation of lithium dendrites pose challenges to safety and stability of lithium metal batteries(LMBs).The appearance of gel polymer electrolyte(GPE)has obviously improved the safety of traditional ***,the limited inhibition of GPE on lithium dendrites is detrimental to the safety of ***,a kind of poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)/gelatin(GN)GPE with high ionic conductivity,high-temperature resistance,and flame-retardancy,was prepared by electrospinning and soaking *** the electrospinning network of PVDF-HFP,its affinity to liquid electrolytes,makes this GPE more beneficial to ions transport and the formation of ***,the GN with sol–gel properties,enhances the mechanical property(13.5 MPa)of HFP-GN ***,X-ray photoelectron spectroscopy(XPS)and density functional theory(DFT)suggest that the attraction of polar groups of GN to Li+can regulate the distribution of Li+and protect Li ***,the application of HFP-GN GPEs to LMBs with cathodes of LiFePO_(4) and LiCoO_(2) deliver excellent electrochemical performances:after 300 cycles,the LiFePO_(4)/HFP-GN GPE/Li battery keeps a low capacity decay rate of 0.09%at 5 C;after 400 cycles at 2 C,the LiCoO_(2)/HFP-GN GPE/Li cell retains a high capacity retention of 74%.This GPE is demonstrated for the application prospect of safe LMBs.

关键词： poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP) gelatin polar groups lithium metal battery lithium dendrite

Three-dimensional macroscopic absorbents: From synergistic effects to advanced multifunctionalities

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Nano Research 2024年第3期17卷 1952-1983页

作者： shijie zhang Di Lan Xingliang Chen Yueyuan Gu Junwen Ren Suxuan Du Shichang Cai Xiaomiao Zhao Zhiwei Zhao Guanglei Wu School of Material Science and Engineering Henan University of TechnologyZhengzhou 450001China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province Shaoxing UniversityShaoxing 312000China School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001China College of Electrical Engineering Sichuan UniversityChengdu 610065China Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationSchool of Electrical&Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China

The accelerated arriving of 5G era has brought a new round of intelligent transformation which will completely emancipate smart terminal *** the subsequent deleterious effect of electromagnetic wave on electronic devices is increasingly serious,driving the growth of next-generation electromagnetic wave *** a tactful combination of components and structures,three-dimensional(3D)macroscopic absorbents with fascinating synergy afford exceptional electromagnetic wave absorption,and tremendous efforts have been devoted to this ***,in terms of macroscopic absorbents and their synergistic effect,few reviews are proposed to comb the latest achievements and detailed *** review article focuses on the synergistic effect of macro-architectured absorbents mainly including structure-induced synergy,structure-components synergy,and multiple-components induced *** then the potential construction principles and strategies of macroscopic absorbents are ***,the key information for structures and components manipulation including nano-micro design and components regulation is further dissected by critically selected cutting-edge 3D macroscopic ***,a brief summary of multifunctional electromagnetic wave absorbents(EWAs)-based macroscopic structures is ***,the development prospects and challenges of these materials are discussed.

关键词： three-dimensional(3D)structures synergistic effect electromagnetic wave absorption absorption mechanism multifunction

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基于改进叠加法的变几何轴流压气机性能预测

清华大学学报（自然科学版） 2024年第5期64卷 869-878页

作者：刘欢张士杰中国科学院大学工程科学学院北京100190 中国科学院工程热物理研究所先进能源动力重点实验室北京100190

压气机作为燃气轮机的核心部件,对燃气轮机及其热力循环的性能影响显著,准确预测压气机性能至关重要。该文基于通用级特性曲线,采用改进的逐级叠加法构建了一个变几何多级轴流式压气机性能预测模型。该模型针对现代重型燃气轮机压气机... 详细信息

压气机作为燃气轮机的核心部件,对燃气轮机及其热力循环的性能影响显著,准确预测压气机性能至关重要。该文基于通用级特性曲线,采用改进的逐级叠加法构建了一个变几何多级轴流式压气机性能预测模型。该模型针对现代重型燃气轮机压气机的变几何特点,提出了考虑入口导叶(IGV)和可变静叶(VSV)的压气机级特性计算方法。通过在引气级所对应的连续性方程中扣除引气量的方式,该模型还预测了级间引气对压气机性能的影响。与实验结果的对比验证表明:该模型不仅可准确地预测压气机整机性能及变几何结构、级间引气对压气机性能的影响,结果的相对误差最低可达0.450%,而且可得到压气机各级的几何参数和热力学参数,为后续开发压气机部件稳态和动态模型提供了基础。

关键词：轴流式压气机变几何多级性能预测级间引气

虚拟集聚视域下中国农村金融包容的时空演化特征与驱动因素

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地理科学 2024年第6期44卷 1005-1015页

作者：田霖张仕杰田青郑州大学商学院河南郑州450001 河南省省直机关住房资金管理中心河南郑州450003

基于虚拟集聚视域下构建农村金融包容测度体系,利用熵值法拟合农村金融包容水平指数,借助时空地理加强回归等方法考察其时空动态分异特征和驱动因素。研究发现:(1)全国各省域农村金融包容水平呈逐年上升趋势,空间分布呈现“东部沿海高,... 详细信息

基于虚拟集聚视域下构建农村金融包容测度体系,利用熵值法拟合农村金融包容水平指数,借助时空地理加强回归等方法考察其时空动态分异特征和驱动因素。研究发现:(1)全国各省域农村金融包容水平呈逐年上升趋势,空间分布呈现“东部沿海高,中西部低”的梯度分异特征,且中西部的“追赶效应”显著;(2)考察期内非均衡性波动下降,但处于较高水平,有一定的两极分化趋势;农村金融包容总体差距呈逐渐波动下降态势,区域间差距是造成总体差距的主要根源所在,其次是区域内;(3)从影响因素分析,农村就业水平、农村居民收入水平、金融素养可有效支持农村金融得包容性发展;农村经济发展环境和城乡统筹发展两维度对金融包容的影响存在空间分异,城乡收入比始终为负效应,各影响因素对南北地区差异变化敏感度强于东西地区。

关键词：虚拟集聚农村金融包容时空地理加权回归时空异质性

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萱草新品种‘圣诞宝贝’和‘火流星’

园艺学报 2024年第2期51卷 459-460页

作者：白露张志国张世杰秦巧平上海应用技术大学生态技术与工程学院上海201418

萱草(Hemerocallis fulva)‘圣诞宝贝’是以‘圣诞红’为母本,以‘歉意’为父本杂交选育出的二倍体晚花品种,花期7—8月,花葶高72 cm,花径11 cm,花量极大,花色鲜艳,香味怡人。萱草‘火流星’是以‘萨米罗素’为母本,以‘秋红’为父本杂... 详细信息

萱草(Hemerocallis fulva)‘圣诞宝贝’是以‘圣诞红’为母本,以‘歉意’为父本杂交选育出的二倍体晚花品种,花期7—8月,花葶高72 cm,花径11 cm,花量极大,花色鲜艳,香味怡人。萱草‘火流星’是以‘萨米罗素’为母本,以‘秋红’为父本杂交选育出的二倍体中晚花品种,花期6—7月,花葶高65 cm,花径9 cm,花量极大,花色亮丽、花形为规则的五角星形。

关键词：萱草杂交品种

基于VOF-CA-LB耦合模型的枝晶运动行为研究

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特种铸造及有色合金 2024年第6期44卷 770-775页

作者：张冰朱宝丰张士杰张宇李日河北工业大学材料科学与工程学院天津300401

将计算流体力学中的流体体积函数法与模拟枝晶生长的元胞自动机模型耦合,研究凝固过程的晶粒运动行为。结果表明,流体体积函数法具有良好的界面保真性,可准确追踪固-液界面,不会对后续的枝晶生长计算产生影响;枝晶的运动行为会影响熔体... 详细信息

将计算流体力学中的流体体积函数法与模拟枝晶生长的元胞自动机模型耦合,研究凝固过程的晶粒运动行为。结果表明,流体体积函数法具有良好的界面保真性,可准确追踪固-液界面,不会对后续的枝晶生长计算产生影响;枝晶的运动行为会影响熔体中的溶质分布,从而影响枝晶的生长形态。该耦合模型可准确模拟枝晶运动过程,解决了元胞自动机方法研究晶粒运动行为无法同时满足高形状保真性和高计算效率的问题。

关键词：枝晶运动流体体积函数格子玻尔兹曼元胞自动机

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