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A novelapproachforsuppressingleakage flow throughturbinebladetipgaps

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Propulsion and Power Research 2022年第4期11卷 431-443页

作者： tianyi wang Yimin Xuan Jiangsu Province Key Laboratory of Aerospace Power System Nanjing University of Aeronautics and AstronauticsNanjing210016China

Tip clearance leakage flow of the turbine bade is an important factor limiting the augment of the high pressure turbine efficiency,which should be suppressed utilizing certain ***,the passive control method with the traditional structure is more and more difficult to satisfy the suppressing ability of the advanced turbine *** the present paper,a synergetic suppressing method by combining the approach of blade shape modification and spontaneous injection is adopted,to construct a novel tip *** aerodynamic characteristics of the tip leakage flow(TLF)with different blade tip configurations,such as the squealer,squealer-winglet(SW)and squealer-winglet-spontaneous injection holes(SWS)composite configurations,are numerically *** impacts of several key geometric parameters,such as the winglet width and the space ng of spontaneous injection holes,are also *** to the adjustment of the winglet,the SW tip configuration can get better suppressing effect on TLF than the squealer *** SWS synergetic suppression tip decrease the leakage flow rate and the leakage mixing loss on the basis of the SW tip due to the blocking effect of the spontaneous injection *** key geometric parameters study shows that the suppressing effect of the TLF can be improved by reasonably increasing the winglet width and reducing the spacing between spontaneous injection holes.

关键词： Gas turbine Blade Tip leakage flow Squealer winglet tip Spontaneous injection

Design and analysis of linear oscillating motor for linearpump application-magnetic field, dynamics and thermotics

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Frontiers of Mechanical Engineering 2016年第4期11卷 351-362页

作者： Zongxia JIAO tianyi wang Liang YAN School of Automation Science and Electrical Engineering BeihangUniversity Beijing 100191 China Shenzhen Research Institute ofBeihang University Shenzhen 518057 China

A linear oscillating motor is an electromagnetic actuator that can achieve short-stroke reciprocating movement directly without auxiliary transmission mechanisms. It has been widely used in linear pump applications as the source of power and motion. However, because of the demand of high power density in a linear actuation system, the performance of linear oscillating motors has been the focus of studies and deserves further research for high power density. In this paper, a general framework of linear oscillating motor design and optimization is addressed in detail, including the electromagnetic, dynamics, and thermal aspects. First, the electromagnetic and dynamics characteristics are modeled to reveal the principle for optimization. Then, optimization and analysis on magnetic structure, resonant system, and thermal features are conducted, which provide the foundation for prototype development. Finally, experimental results are provided for validation. As a whole, this process offers complete guidance for high power density linear oscillating motors in linear pump applications.

关键词： linear oscillating motor linear pump magnetic field motor optimization

Boosted electrochemical performance of Na_(3)V_(2)(PO_(4))_(3) at low temperature through synergistical F substitution and construction of interconnected nitrogen-doped carbonaceous network

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Journal of Materials Science & Technology 2023年第19期150卷 159-167页

作者： Jiabao Li Ziqian Li Shaocong Tang tianyi wang Likun Pan Chengyin wang School of Chemistry and Chemical Engineering Yangzhou University180 Si-Wang-Ting RoadYangzhouJiangsu 225002China Shanghai key laboratory of Magnetic Resonance School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062China

Benefitting from its unique NASICON-type framework,the Na_(3)V_(2)(PO_(4))_(3)(NVP)cathodes have aroused extensive interest and have been deemed as the promising cathode candidate for sodium-ion batteries(SIBs).Unfortunately,the poor electronic conductivity,combined with the undesirable volume variations,seriously hinders the practical application of NVP cathode,especially at low ***,a dual-strategy,F substitution accompanied by V vacancies and the construction of three-dimensional(3D)nitrogen-doped carbonaceous frameworks(NC),were employed for the NVP cathode(F-NVP/C@3DNC).The former can remarkably decrease the particle size and enhance Na^(+)migration capability,increasing the ionic ***,the electronic connection and effective buffering can be obtained from the latter,strengthening the electrode ***,up to 100 cycles at 0.1 A g^(-1),a reversible capacity of 113.8 mAh g^(-1),approaching the theoretical value(117 mAh g^(-1)),is demonstrated,accompa-nied by impressive capacity retentions at 1.0(93.75%after 4800 cycles)and 20.0 A g^(-1)(92.7%after 1000 cycles).More importantly,even at-20℃,a superior specific capacity(102.6 mAh g^(-1) after 100 cycles at 0.1 A g^(-1))and high capacity retention(86.6%at 20.0 A g^(-1) up to 1000 cycles)can still be obtained ***,the design of F-NVP/C@3DNC provides insights for the fabrication of polyanion cathodes for applications at low temperatures with modified structure stability and reaction kinetics.

关键词： Na_(3)V_(2)(PO_(4))_(3) F substitution Interconnected carbonaceous frameworks Ionic/electronic conductivity Performance at low temperature

Flexible sodium-ion capacitors boosted by high electrochemicallyreactive and structurally-stable Sb_(2)S_(3)nanowire/Ti_(3)C_(2)Tx MXene film anodes

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Nano Research 2023年第4期16卷 5592-5600页

作者： Jian Yang tianyi wang Xin Guo Xiaoxue Sheng Jiabao Li Chengyin wang Guoxiu wang Institute for Innovative Materials and Energy Faculty of Chemistry and Chemical EngineeringYangzhou UniversityYangzhou 225002China Centre for Clean Energy Technology School of Mathematics and PhysicsFaculty of ScienceUniversity of Technology SydneySydneyNSW 2007Australia

The rapid development of portable,foldable,and wearable electronic devices requires flexible energy storage *** capacitors(SICs)combining the high energy of batteries and the high power of supercapacitors are promising ***,the lack of flexible and durable electrode materials that allow fast and reversible Na+storage hinders the development of flexible ***,we report a high-capacity,free-standing and flexible Sb2S3/Ti_(3)C_(2)Tx composite film for fast and stable sodium *** this hybrid nano-architecture,the Sb_(2)S_(3)nanowires uniformly anchored between Ti_(3)C_(2)Tx nanosheets not only act as sodium storage reservoirs but also pillar the two-dimensional(2D)Ti_(3)C_(2)Tx to form three-dimensional(3D)channels benefiting for electrolyte ***,the highly conductive Ti_(3)C_(2)Tx nanosheets provide rapid electron transport pathways,confine the volume expansion of Sb_(2)S_(3)during sodiation,and restrain the dissolution of discharged sodium polysulfides through physical constraint and chemical *** to the synergistic effects of the one-dimensional(1D)Sb_(2)S_(3)nanowires and 2D MXenes,the resultant composite anodes exhibit outstanding rate performance(553 mAh·g−1 at 2 A·g−1)and cycle stability in sodium-ion ***,the flexible SICs using Sb2S3/Ti_(3)C_(2)Tx anodes and active carbon/reduced graphene oxide(AC/rGO)paper cathodes deliver a superior energy and power density in comparison with previously reported devices,as well as an excellent cycling performance with a high capacity retention of 82.78%after 5,000 *** work sheds light on the design of next-generation low-cost,flexible and fast-charging energy storage devices.

关键词： MXene Sb_(2)S_(3)nanowires flexible energy storage devices sodium-ion batteries sodium-ion capacitors

Interface Engineering of Fe_(7)S_(8)/FeS_(2) Heterostructure in situ Encapsulated into Nitrogen‑Doped Carbon Nanotubes for High Power Sodium‑Ion Batteries

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Nano-Micro Letters 2023年第8期15卷 167-180页

作者： Penghao Song Jian Yang Chengyin wang tianyi wang Hong Gao Guoxiu wang Jiabao Li College of Chemistry and Chemical Engineering Yangzhou University180 Si‑Wang‑Ting RoadYangzhou 225002JiangsuPeople’s Republic of China Centre for Clean Energy Technology Faculty of ScienceUniversity of Technology SydneyPO Box 123BroadwayNSW 2007Australia Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education College of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022People’s Republic of China

Heterostructure engineering combined with carbonaceous materials shows great promise toward promoting sluggish kinetics,improving electronic conductivity,and mitigating the huge expansion of transition metal sulfide electrodes for high-performance sodium ***,the iron sulfide-based heterostructures in situ hybridized with nitrogen-doped carbon nanotubes(Fe_(7)S_(8)/FeS_(2)/NCNT)have been prepared through a successive pyrolysis and sulfidation *** Fe_(7)S_(8)/FeS_(2)/NCNT heterostructure delivered a high reversible capacity of 403.2 mAh g^(−1) up to 100 cycles at 1.0 A g^(−1) and superior rate capability(273.4 mAh g^(−1) at 20.0 A g^(−1))in ester-based ***,the electrodes also demonstrated long-term cycling stability(466.7 mAh g^(−1) after 1,000 cycles at 5.0 A g^(−1))and outstanding rate capability(536.5 mAh g^(−1) at 20.0 A g^(−1))in ether-based *** outstanding performance could be mainly attributed to the fast sodium-ion diffusion kinetics,high capacitive contribution,and convenient interfacial dynamics in ether-based electrolyte.

关键词： Iron sulfides Heterostructure Nitrogen-doped carbon nanotubes Ester-based electrolyte Ether-based electrolyte

Synthesis of porous hematite nanorods loaded with CuO nanocrystals as catalysts for CO oxidation

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Journal of Natural Gas Chemistry 2011年第6期20卷 669-676页

作者： Jianliang Cao Yan wang tianyi Ma Yuping Liu Zhongyong Yuan Institute of New Catalytic Materials science Key Laboratory of Advanced Energy Materials Chemistry （Ministry of Education） College of Chemistry Nankai University Tianjin 300071 China

Porous hematite （α-Fe2O3） nanorods with the diameter of 20-40 nm and the length of 80-300 nm were synthesized by a simple surfactant-assisted method in the presence of cetyltrimethylammonium bromide （CTAB）.The α-Fe2O3 nanorods possess a mesostructure with a pore size distribution in the range of 5-12 nm and high surface area,exhibiting high catalytic activity for CO *** nanocrystals were loaded on the surface of porous α-Fe2O3 nanorods by a deposition-precipitation method,and the catalysts exhibited superior activity for catalytic oxidation of CO,as compared with commercial α-Fe2O3 powders supported CuO *** enhanced catalytic activity was attributed to the strong interaction between the CuO nanocrystals and the support of porous α-Fe2O3 nanorods.

关键词： porous materials iron oxide nanostructures CuO supported nanocatalysts catalytic CO oxidation

Fault Diagnosis Method Based on Xgboost and LR Fusion Model under Data Imbalance

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Journal of Beijing Institute of Technology 2022年第4期31卷 401-412页

作者： Liling Ma tianyi wang Xiaoran Liu Junzheng wang Wei Shen School of Automation Beijing Institute of TechnologyBeijing 100081China

Diagnosis methods based on machine learning and deep learning are widely used in the field of motor fault ***,due to the fact that the data imbalance caused by the high cost of obtaining fault data will lead to insufficient generalization performance of the diagnosis *** response to this problem,a motor fault monitoring system is proposed,which includes a fault diagnosis method(Xgb_LR)based on the optimized gradient boosting decision tree(Xgboost)and logistic regression(LR)fusion model and a data augmentation method named data simulation neighborhood interpolation(DSNI).The Xgb_LR method combines the advantages of the two models and has positive adaptability to imbalanced ***,the DSNI method can be used as an auxiliary method of the diagnosis method to reduce the impact of data imbalance by expanding the original data(signal).Simulation experiments verify the effectiveness of the proposed methods.

关键词： imbalanced data fault diagnosis data augmentation method

In-situ electro-polymerization of L-tyrosine enables ultrafast,long cycle life for lithium metal battery

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Chinese Chemical Letters 2023年第5期34卷 561-566页

作者： Zihao Chu Sidong Zhuang Jiahui Lu Jiabao Li Chengyin wang tianyi wang College of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

The growth of dendrites in the lithium(Li)metal anode hinders the commercialization of lithium metal batteries(LMBs).Electrolyte additives have proved to be an effective way to solve the problem of dendrites and improve the coulombic ***,we propose a strategy of using L-tyrosine(L-Tyr)as an additive to protect the lithium metal anode in situ,where L-Tyr can be electropolymerized in situ to form an ordered array of nanosheets on the surface of the lithium metal anode to uniformly deposit lithium *** the same time,the addition of L-Tyr changed the structure of the solvent in the electrolyte,because the carboxyl group on L-Tyr make DME form hydrogen bonds ***,the reduction of free DME makes more TFSI-involved in the formation of the SEI film on the electrode surface,which increases the proportion of LiF in the SEI *** 2 wt%L-Tyr,Li||Li symmetric cells superior cycle stability in ether electrolytes,Li|Cu cells y improved stability up to 200 cycles with an average CE of 93.1%in ether electrolytes and Li||Li_(4)Ti_(5)O_(12)(LTO)demonstrated an excellent cycling capabilitie with 119 mAh/g capacity retention by the 5000^(th)cycle.

关键词： Lithium metal battery Tyrosine In situ Eelectropolymerization lithium dendrite

Three-dimensional crosslinked nanoarchitectonics of CoP@NC anchored on Ti_(3)C_(2)T_(x) with high ionic diffusion and enhanced sodium storage performance

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Journal of Materiomics 2023年第6期9卷 1185-1195页

作者： Zhihao Gu Jiabao Li Penghao Song Yu wang Jian Yang tianyi wang Chengyin wang School of Chemistry and Chemical Engineering Yangzhou University180 Si-Wang-Ting RoadYangzhou225002JiangsuChina

Transition metal phosphides(CoP,etc.),featuring rich natural abundance and remarkable theoretical capacity,suffer from extremely poor rate capability and severe energy decay for sodium storage due to their huge volume change and low electronic ***,an elaborate hierarchical superstructure,nitrogen-doped carbon wrapped CoP in-situ anchored on Ti_(3)C_(2)Tx MXene(CoP@NC/Ti_(3)C_(2)Tx),was fabricated by crosslinking ZIF-67 on Ti_(3)C_(2)Tx flakes followed by successive carbonization and *** principle,the dual modification for CoP nanoparticles through NC coating and Ti_(3)C_(2)T_(x) support can dramatically accelerate the ionic/electronic transportation and alleviate the structure change upon repeated sodiation/desodiation,thus leading to superior electrode integrity,modified ohmic polarization,and excellent electrochemical ***,the elaborated hierarchical superstructure delivers impressive sodium storage performances with large capacity(396.06 mA·h/g at 0.1 A/g up to 100 cycles),robust rate performance(237.8 mA·h/g at 2.0 A/g),and satisfied cyclability(capacity retention of 81.3%at 1.0 A/g after 1,200 cycles).In principle,systematic electrochemical and characterizations measurements manifest that the high pseudocapacitive effect to charge storage,enhanced ionic diffusion kinetics,and remarkable electrochemical reversibility contribute to the impressive sodium storage performance of target CoP@NC/Ti_(3)C_(2)T_(x).Importantly,the unique modification strategy reported in this study paves a way to fabricate high-performance electrode for SIBs.

关键词： CoP ZIF-67 Ti_(3)C_(2)T_(x) High-performance Sodium-ion battery