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Thermal-Economic Comparative Analysis and Optimization of the Maisotsenko Gas Turbine Cycle under Different Configurations

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Journal of Thermal Science 2024年第6期33卷 2151-2165页

作者： SHI Qile HE Weifeng YAO Zhaohui GAO Yanfei su pengfei HAN Dong Advanced Energy Conservation Research Group College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China Collaborative Innovation Center for Advanced Aero-Engine Beijing 100191China State Key Laboratory of Long-Life High Temperature Materials Dongfang Electric Corporation Dongfang Turbine Co.LTDDeyang 618000China

The widespread adoption of Maisotsenko gas turbine cycle(MGTC)is significantly constrained by the design and manufacturing complexity of the *** proposition of innovative approaches to regulate the water carrying capacity and operational environment of the saturator,coupled with the performance and economic evaluation of systems under various configurations,can substantially facilitate its commercial *** the conventional two-stage MGTC system that solely comprises aftercooling and regenerative processes,this study proposes a three-stage MGTC system with an intercooling process(IMGTC),which considers the reuse of cooling water and energy *** pricing allocation and energy depreciation characteristics of components are analyzed,and the impact of key variables is ***,economic optimization of the system is conducted using ISIGHT to identify the optimal parameter combination and *** results indicate that the saturator price of IMGTC is lower and its exergy efficiency is higher than that of *** average water capacity of the IMGTC saturator is only 57.4%of that of the MGTC saturator,but the average exergy efficiency of IMGTC is 1.1%higher than that of ***,external parameters all lead to the levelized cost of electricity(LCOE).Thermo-economic optimization shows that the optimal LCOE of IMGTC is 0.26%lower than that of *** study confirms the feasibility of IMGTC,as well as its thermodynamic and economic advantages over MGTC.

关键词： Maisotsenko gas turbine cycle intercooling exergy efficiency levelized cost of electri thermo-economicoptimization

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Fatigue Topology Optimization Design Based on Distortion Energy Theory and Independent Continuous Mapping Method

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Computer Modeling in Engineering & Sciences 2021年第7期128卷 297-314页

作者： Hongling Ye Zonghan Li Nan Wei pengfei su Yunkang sui Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing100124China

Fatigue failure is a common failure mode under the action of cyclic loads in engineering applications,which often occurs with no obvious *** maximum structural stress is far below the allowable stress when the structures are *** at the lightweight structure,fatigue topology optimization design is investigated to avoid the occurrence of fatigue failure in the structural conceptual design ***,the fatigue life is expressed by topology variables and the fatigue life filter *** continuum fatigue optimization model is established with the independent continuous mapping(ICM)***,fatigue life constraints are transformed to distortion energy constraints explicitly by taking advantage of the distortion energy ***,the optimization formulation is solved by the dual sequence quadratic programming(DSQP).And the design scheme of lightweight structure considering the fatigue characteristics is ***,numerical examples illustrate the practicality and effectiveness of the fatigue optimization *** method further expands the theoretical application of the ICM method and provides a novel approach for the fatigue optimization problem.

关键词： Fatigue optimization distortion energy theory S-N curve independent continuous mapping method

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Evolutionary mechanism and frequency response of graphite electrode at extreme temperatures

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Nano Research 2024年第8期17卷 7283-7289页

作者： Shanpeng Pei Zhiyong Zhang Xiuli Zhang Yan Liu Xiang Han Linshan Luo pengfei su Chaofei Lan Wei Huang Ziqi Zhang Ming-Sheng Wang Songyan Chen Department of Physics Xiamen UniversityXiamen 361005China Shandong Electric Power Engineering Consulting Institute Corporation Jinan 250031China State Key Lab of Physical Chemistry of Solid surfaces College of MaterialsXiamen UniversityXiamen 361005China School of Semiconductor Science and Technology South China Normal UniversityFoshan 528225China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China National Key Laboratory of Integrated Circuits and Microsystems Chongqing 400000China

The battery management system is employed to monitor the external temperature of the lithium-ion battery in order to detect any potential ***,this outside–in detection method often suffers from a lag and is therefore unable to accurately predict the battery’s real-time ***,an inside–out frequency response approach is used to accurately monitor the battery’s state at various temperatures in real-time and correlate it with the solid electrolyte interphase(SEI)evolution of the graphite *** SEI evolution at temperatures of−15,25,60,and 90℃exhibits certain regular characteristics with temperature *** a temperature of−15℃,the Li^(+)-solvent interaction of lithium-ion slowed down,resulting in a significant reduction in *** 25℃,a LiF-rich inorganic SEI was identified as forming,which facilitated lithium-ion ***,high temperatures would induce decomposition of lithium hexafluorophosphate(LiPF_(6))and lithium-ion *** the extreme temperature of 90℃,the SEI would be organic-rich,and Li_(x)P_(y)F_(z),a decomposition product of lithium salts,was further oxidized to Li_(x)PO_(y)F_(z),which led to a surge in the charge-transfer resistance at SEI(R_(sei))and a reduction in Coulombic efficiency(CE).This changing relationship can be recorded in real time from the inside out by electrochemical impedance spectroscopy(EIS)*** provides a new theoretical basis for the structural evolution of lithium-ion batteries and the regular characterization of EIS.

关键词： graphite electrode solid electrolyte interphase(SEI)film extreme temperatures frequency response evolutionary mechanism

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Cu nanowire array with designed interphases enabling high performance Si anode toward flexible lithium-ion battery

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Nano Research 2024年第3期17卷 1516-1524页

作者： pengfei su Ziqi Zhang Linshan Luo Zhiyong Zhang Chaofei Lan Yahui Li Shaowen Xu Shanpeng Pei Guangyang Lin Cheng Li Xiang Han Wei Huang Songyan Chen Fujian Provincial Key Laboratory of Semiconductors and Applications Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesDepartment of PhysicsXiamen UniversityXiamen 361005China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Science and Technology on Analog Integrated Circuit Laboratory Chongqing 400060China Shandong Electric Power Engineering Consulting Institute Co. Ltd.Jinan 250013China

To meet the growing demand for wearable smart electronic devices,the development of flexible lithium-ion batteries(LIBs)is *** is an ideal candidate for the anode material of flexible lithium-ion batteries due to its high specific capacity,low working potential,and earth *** largest challenge in developing a flexible silicon anode is how to maintain structural integrity and ensure stable electrochemical reactions during external *** this work,we propose a novel design for fabricating core–shell electrodes based on a copper nanowire(CuNW)array core and magnetron sputtered Si/C *** nanowire array structure has characteristics of bending under longitudinal stress and twisting under transverse stress,which helps to maintain the mechanical stability of the structure during electrode bending and *** low-temperature annealing generates a small amount of Cu3Si alloy,which enhances the connection strength between Si and the conductive network and solves the poor conductivity problem of Si,which is known as a semiconductor *** unique configuration design of CuNW@Si@C-400℃ leads to stable long cycle performance of 1109 mAh∙g^(-1) after 1000 cycles and excellent rate performance of 500 mAh∙g^(-1) at a current density of 10 A∙g^(-1).Furthermore,the CuNW@Si@C-400℃||LiFePO_(4)(LFP)full battery demonstrates excellent flexibility,with a capacity retention of more than 96%after 100 *** study provides a promising strategy for the development of flexible lithium-ion batteries.

关键词： flexible lithium-ion battery silicon anode magnetron sputtering core–shell electrode Cu nanowire array

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重型燃气轮机排气温度研究

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工程热物理学报 2024年第1期45卷 107-114页

作者：苏鹏飞赵世全方宇清洁高效透平动力装备全国重点实验室德阳618000 东方电气集团东方汽轮机有限公司德阳618000

本文针对某300 MW等级重型燃气轮机透平排气温度,构建了燃机性能计算模型,该模型除了包含常规燃机性能计算的功能外,加入了透平叶片材料、燃烧器OTDF&RTDF及叶片冷却流量对燃机性能的影响功能,应用该燃气轮机性能计算模型预测了L20A及M7... 详细信息

本文针对某300 MW等级重型燃气轮机透平排气温度,构建了燃机性能计算模型,该模型除了包含常规燃机性能计算的功能外,加入了透平叶片材料、燃烧器OTDF&RTDF及叶片冷却流量对燃机性能的影响功能,应用该燃气轮机性能计算模型预测了L20A及M701F3的燃机性能,排气温度的预测精度在3℃以内。分析了压气机压比、压气机效率、燃烧器压损、燃烧器出口温度分布、透平级数、透平效率、透平叶片材料及冷气流量等参数对透平排气温度的影响规律,结果显示压气机压比、燃烧器出口温度分布、透平级数及效率、透平叶片材料及冷气流量对燃机透平排气温度影响较大,其中又以透平级数的设计选择对排气温度影响最大。在燃机设计时需要考虑到这些关键影响因素,使排气温度最终达到综合最优。

关键词：重型燃机性能计算排气温度布雷顿循环

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高速铁路轮轨电弧烧损绝缘节的研究

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铁道学报 2022年第8期44卷 36-41页

作者：苏鹏飞谭丽温润兰州交通大学自动化与电气工程学院甘肃兰州730070 西北民族大学电气工程学院甘肃兰州730030

高速列车经过站内牵引回流切断点时,牵引回流电流会短暂断开,此时在轮轨处会形成拉弧,电弧高温会使胶粘绝缘节碳化,导致其无法满足轨道电路绝缘的要求。为此基于Hertz接触理论及电接触理论,分析轮轨接触斑点上电压分布情况,并求解得到... 详细信息

高速列车经过站内牵引回流切断点时,牵引回流电流会短暂断开,此时在轮轨处会形成拉弧,电弧高温会使胶粘绝缘节碳化,导致其无法满足轨道电路绝缘的要求。为此基于Hertz接触理论及电接触理论,分析轮轨接触斑点上电压分布情况,并求解得到相应电压等级的电弧温度分布,分析绝缘节的碳化规律。结果表明,当轮轨电压达到20V时,电弧中心温度为97 K,说明20 V时不产生电弧,绝缘节此时并未发生碳化;当轮轨电压达到80.77 V时,绝缘节温度为1.369×10^(3)K,绝缘节碳化率达到100%。

关键词：电弧胶粘绝缘节相变碳化

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Tuning the electron transport behavior at Li/LATP interface for enhanced cyclability of solid-state Li batteries

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Nano Research 2023年第1期16卷 1634-1641页

作者： Linshan Luo Feng Zheng Haowen Gao Chaofei Lan Zhefei sun Wei Huang Xiang Han Ziqi Zhang pengfei su Peng Wang Shengshi Guo Guangyang Lin Jianfang Xu Jianyuan Wang Jun Li Cheng Li Qiaobao Zhang Shunqing Wu Ming-Sheng Wang Songyan Chen Department of Physics Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesKey Laboratory of Low Dimensional Condensed Matter Physics(Department of Education of Fujian Province)Jiujiang Research InstituteXiamen UniversityXiamen 361005China State Key Lab of Physical Chemistry of Solid surfaces College of MaterialsXiamen UniversityXiamen 361005China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Western Digital Corporation 951 Sandisk DrMilpitasCA 95035USA

An interlayer is usually employed to tackle the interfacial instability issue between solid electrolytes(SEs)and Li metal caused by the side ***,the failure mechanism of the ionic conductor interlayers,especially the influence from electron penetration,remains largely ***,using Li1.3Al0.3Ti1.7(PO4)3(LATP)as the model SE and LiF as the interlayer,we use metal semiconductor contact barrier theory to reveal the failure origin of Li/LiF@LATP interface based on the calculation results of density functional theory(DFT),in which electrons can easily tunnel through the LiF grain boundary with F vacancies due to its narrow barrier width against electron injection,followed by the reduction of ***,an Al-LiF bilayer between Li/LATP is found to dramatically promote the interfacial stability,due to the highly increased barrier width and homogenized electric field at the ***,the Li symmetric cells with Al-LiF bilayer can exhibit excellent cyclability of more than 2,000 h superior to that interlayered by LiF monolayer(~860 h).Moreover,the Li/Al-LiF@LATP/LiFePO4 solid-state batteries deliver a capacity retention of 83.2%after 350 cycles at 0.5 *** findings emphasize the importance of tuning the electron transport behavior by optimizing the potential barrier for the interface design in high-performance solid-state batteries.

关键词： solid-state electrolyte Li metal LiF Al electron transport interfacial barrier

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Chromatograph Skeleton Components of Feng-flavor Baijiu during Different Production Stages

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Asian Agricultural Research 2022年第4期14卷 40-43页

作者： Lili LIU Hui YANG Zongke YAN Yaohua QI Xiong JING pengfei su School of Food and Biology Engineering Shaanxi University of Science & Technology Xi'an 710021 China Shaanxi Xifeng Wine Co. Ltd. Baoji 721000 China

Production of Feng-flavor baijiu includes six stages(first fermented stage,second fermented stage,third fermented stage,normal fermented stage and quitting fermented stage,ending of fermented stage).Each stage of the base liquor has its own *** main chromatogram structure components were analyzed by gas chromatography(GC),to explore the characteristics of base baijiu during different production stages,which can provide a reference for classification storage and body design of baijiu.

关键词： Feng-flavor baijiu Production stages Chromatograph skeleton components

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基于ANSYS的荷载工况对轮轨接触阻抗的影响

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重庆大学学报 2023年第6期46卷 122-129页

作者：苏鹏飞谭丽温润兰州交通大学自动化与电气工程学院兰州730070 西北民族大学电气工程学院兰州730030

高速铁路站内绝缘节烧损事故时有发生,轮轨接触电阻是引起轮轨电弧造成绝缘节烧损的重要指标,因此准确计算接触电阻是分析绝缘节烧损问题的重要基础,接触电阻的大小主要取决于轮轨接触斑点的面积。对此,通过有限元分析软件ANSYS计算不... 详细信息

高速铁路站内绝缘节烧损事故时有发生,轮轨接触电阻是引起轮轨电弧造成绝缘节烧损的重要指标,因此准确计算接触电阻是分析绝缘节烧损问题的重要基础,接触电阻的大小主要取决于轮轨接触斑点的面积。对此,通过有限元分析软件ANSYS计算不同荷载工况下轮轨接触面积,分析列车轴重和偏移量对接触电阻的影响规律。结果表明,轴重从9 t增加到27 t时,轮轨接触电阻减小近36.2%;横移量增大10 mm时,轮轨接触电阻减小18.9%。轮轨接触电阻的变化随着轴重和轮轨横移量的增加呈现相同变化趋势。

关键词：有限元法荷载工况接触面积接触电阻

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大型复杂锻件打磨路径的智能化规划方法

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机械工程学报 2024年第11期60卷 216-225页

作者：闫守鑫王伟苏鹏飞贠超北京航空航天大学机械工程及自动化学院北京100191

大型复杂锻件作为能源、船舶、交通等领域的主要承力构件,对后处理的尺寸精度和表面质量要求高,实现大型复杂锻件的自动化打磨是锻造行业亟待解决的共性难题。主要技术障碍之一是:大型复杂锻件存在较大的热变形、多种随机锻造缺陷,难以... 详细信息

大型复杂锻件作为能源、船舶、交通等领域的主要承力构件,对后处理的尺寸精度和表面质量要求高,实现大型复杂锻件的自动化打磨是锻造行业亟待解决的共性难题。主要技术障碍之一是:大型复杂锻件存在较大的热变形、多种随机锻造缺陷,难以自动生成打磨加工路径。首先提出了一种大型复杂锻件随机缺陷识别算法,通过随机采样一致性算法(Random sample consensus,RANSAC)与改进迭代最近点(Modified iterative closest point,M-ICP)算法相结合,对标准件点云与锻件点云进行配准,得到需要打磨的随机缺陷点云;接着,按照缺陷面积大小,对随机缺陷点云进行的分类,建立了打磨路径生成策略;然后,利用随机缺陷点云中的位置坐标信息,不需要CAD模型,直接生成了机器人打磨路径;最后,开展了大型复杂锻件的机器人打磨实验,实验结果表明:打磨路径智能化生成方法准确识别了随机锻造缺陷特征,正确规划了机器人打磨路径,提高了打磨效率和打磨质量,为大型复杂锻件后处理加工提供了技术方法。

关键词：缺陷识别智能化打磨路径规划大型复杂锻件

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