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Reheat effect on the improvement in efficiency of the turbine driven by pulse detonation

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Defence Technology（防务技术） 2024年第1期31卷 200-210页

作者： Junyu Liu Zhiwu Wang Zixu Zhang Junlin Li weifeng Qin Jingjing huang School of Power and Energy Northwestern Polytechnical UniversityXi’an 710072China Shenzhen Research Institute of Northwestern Polytechnical University Shenzhen 518057China Mechanical Engineering College Xi’an Shiyou UniversityXi’an 710065China

Due to the strong unsteadiness of pulse detonation,large flow losses are generated when the detonation wave interacts with the turbine blades,resulting in low turbine efficiency.Considering that the flow losses are dissipated into the gas as heat energy,some of them can be recycled during the expansion process in subsequent stages by the reheat effect,which should be helpful to improve the detonationdriven turbine efficiency.Taking this into account,this paper developed a numerical model of the detonation chamber coupled with a two-stage axial turbine,and a stoichiometric hydrogen-air mixture was used.The improvement in turbine efficiency attributable to the reheat effect was calculated by comparing the average efficiency of the stages with the efficiency of the two-stage turbine.The research indicated that the first stage was critical in suppressing the flow unsteadiness caused by pulse detonation,which stabilized the intake condition of the second stage and consequently allowed much of the flow losses from the first stage to be recycled,so that the efficiency of the two-stage turbine was improved.At a 95%confidence level,the efficiency improvement was stable at 4.5%—5.3%,demonstrating that the reheat effect is significant in improving the efficiency of the detonation-driven turbine.

关键词： Pulse detonation turbine engine Hydrogen detonation Turbine efficiency Reheat effect Multi-cycle detonation

Lithium sulfide:a promising prelithiation agent for high-performance lithium-ion batteries

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SusMat 2024年第1期4卷 34-47页

作者： Junkang huang weifeng Li Wenli Zhang Bixia Lin Yang Wang SiuWing Or Shuhui Sun Zhenyu Xing School of Chemistry South China Normal UniversityGuangzhouP.R.China Guangdong Provincial Key Laboratory of Plant Resources Biorefinery School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhouP.R.China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchunP.R.China Department of Electrical and Electronic Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong Institut National de la Recherche Scientifique(INRS) Centreénergie Matériaux TélécommunicationsVarennesCanada

Lithium-ion batteries are widely used in portable electronics and electric vehicles due to their high energy density,stable cycle life,and low self-discharge.However,irreversible lithium loss during the formation of the solid electrolyte interface greatly impairs energy density and cyclability.To compensate for the lithium loss,introducing an external lithium source,that is,a prelithiation agent,is an effective strategy to solve the above problems.Compared with other prelithiation strategies,cathode prelithiation is more cost-effective with simpler operation.Among various cathode prelithiation agents,we first systematically summarize the recent progress of Li_(2)S-based prelithiation agents,and then propose some novel strategies to tackle the current challenges.This review provides a comprehensive understanding of Li_(2)S-based prelithiation agents and new research directions in the future.

关键词： Li-ion batteries prelithiation Li2S prelithiation agent metallothermic reduction reaction

Discriminative Features of Abnormities in a Spiral Groove Gas Face Seal Based on Dynamic Model Considering Contact

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Chinese Journal of Mechanical Engineering 2022年第2期35卷 135-149页

作者： Yuan Yin weifeng huang Decai Li Songtao Hu Xiangfeng Liu Ying Liu State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China

It is a difficult task to root the cause of the failure of a gas face seal because different causes may result in similar observations.In the work being presented,the discrimination of multiple types of abnormities in a spiral groove gas face seal is studied.A dynamic model is employed to analyze groups of cases in order to uncover the dynamic behaviors when the face contact is induced by different mixtures of abnormities,whose discriminative features when motion and contact are monitored are studied and uncovered.A circumferential-pattern-related oscillation phenomenon is discovered,which is extracted from contact information and implies the relative magnitude of the moment on stator and the rotor tilt.The experimental observation shows consistent results.It means that the grooves(or other circumferential patterns)generate useful informative features for monitoring.These results provide guidance for designing a monitored gas face seal system.

关键词： Gas face seals Dynamics Tribology Nonlinear system

Review of Clustering Technology and Its Application in Coordinating Vehicle Subsystems

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Automotive Innovation 2023年第1期6卷 89-115页

作者： Caizhi Zhang weifeng huang Tong Niu Zhitao Liu Guofa Li Dongpu Cao Chongqing Automotive Collaborative Innovation Centre The State Key Laboratory of Mechanical TransmissionsChongqing UniversityChongqing 400044China State Key Laboratory of Industrial Control Technology Institute of Cyber‑Systems and ControlZhejiang UniversityHangzhou 310027China School of Vehicle and Mobility Tsinghua UniversityBeijingChina

Clustering is an unsupervised learning technology,and it groups information(observations or datasets)according to similarity measures.Developing clustering algorithms is a hot topic in recent years,and this area develops rapidly with the increasing complexity of data and the volume of datasets.In this paper,the concept of clustering is introduced,and the clustering technologies are analyzed from traditional and modern perspectives.First,this paper summarizes the principles,advantages,and disadvantages of 20 traditional clustering algorithms and 4 modern algorithms.Then,the core elements of clustering are presented,such as similarity measures and evaluation index.Considering that data processing is often applied in vehicle engineering,finally,some specific applications of clustering algorithms in vehicles are listed and the future development of clustering in the era of big data is highlighted.The purpose of this review is to make a comprehensive survey that helps readers learn various clustering algorithms and choose the appropriate methods to use,especially in vehicles.

关键词： Unsupervised learning Clustering Similarity measures Vehicle

Method for solving the nonlinear inverse problem in gas face seal diagnosis based on surrogate models

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Frontiers of Mechanical Engineering 2022年第3期17卷 229-243页

作者： Yuan YIN weifeng huang Decai LI Qiang HE Xiangfeng LIU Ying LIU State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing100084China

Physical models carry quantitative and explainable expert knowledge.However,they have not been introduced into gas face seal diagnosis tasks because of the unacceptable computational cost of inferring the input fault parameters for the observed output or solving the inverse problem of the physical model.The presented work develops a surrogate-model-assisted method for solving the nonlinear inverse problem in limited physical model evaluations.The method prepares a small initial database on sites generated with a Latin hypercube design and then performs an iterative routine that benefits from the rapidity of the surrogate models and the reliability of the physical model.The method is validated on simulated and experimental cases.Results demonstrate that the method can effectively identify the parameters that induce the abnormal signal output with limited physical model evaluations.The presented work provides a quantitative,explainable,and feasible approach for identifying the cause of gas face seal contact.It is also applicable to mechanical devices that face similar difficulties.

关键词： surrogate model gas face seal fault diagnosis nonlinear dynamics tribology

Diversity and connectedness of brine shrimp viruses in global hypersaline ecosystems

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Science China(Life Sciences) 2024年第1期67卷 188-203页

作者： Xuan Dong Cixiu Li Yiting Wang Tao Hu Fan Zhang Fanzeng Meng Meirong Gao Xuekai Han Guohao Wang Jiahao Qin Hans Nauwynck Edward CHolmes Patrick Sorgeloos Liying Sui Jie huang weifeng Shi State Key Laboratory of Mariculture Biobreeding and Sustainable Goods Yellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesLaboratory for Marine Fisheries Science and Food Production ProcessesLaoshan LaboratoryKey Laboratory of Maricultural Organism Disease ControlMinistry of Agriculture and Rural AffairsQingdao Key Laboratory of Mariculture Epidemiology and BiosecurityQingdao 266071China Shandong Provincial Hospital Affiliated to Shandong First Medical University Jinan 250021China Key Laboratory of Emerging Infectious Diseases in Universities of Shandong Shandong First Medical University&Shandong Academy of Medical SciencesTaian 271000China Dalian Ocean University Dalian 116023China Asian Regional Artemia Reference Center Tianjin University of Science&TechnologyTianjin 300457China Ghent University Ghent 9000Belgium Sydney Institute for Infectious Diseases School of Medical SciencesThe University of SydneySydney 2006Australia Network of Aquaculture Centres in Asia-Pacific Bangkok 10900Thailand School of Public Health Shandong First Medical University&Shandong Academy of Medical SciencesJinan 250117China

Brine shrimp(Artemia)has existed on Earth for 400 million years and has major ecological importance in hypersaline ecosystems.As a crucial live food in aquaculture,brine shrimp cysts have become one of the most important aquatic products traded worldwide.However,our understanding of the biodiversity,prevalence and global connectedness of viruses in brine shrimp is still very limited.A total of 143 batches of brine shrimp(belonging to seven species)cysts were collected from six continents including 21 countries and more than 100 geographic locations worldwide during 1977–2019.In total,55 novel RNA viruses were identified,which could be assigned to 18 different viral families and related clades.Eleven viruses were dsRNA viruses,16 were+ssRNA viruses,and 28 were−ssRNA viruses.Phylogenetic analyses of the RNA-directed RNA polymerase(RdRp)showed that brine shrimp viruses were often grouped with viruses isolated from other invertebrates and fungi.Remarkably,most brine shrimp viruses were related to those from different hosts that might feed on brine shrimp or share the same ecological niche.A notable case was the novel brine shrimp noda-like virus 3,which shared 79.25%(RdRp)and 63.88%(capsid proteins)amino acid identity with covert mortality nodavirus(CMNV)that may cause losses in aquaculture.In addition,both virome composition and phylogenetic analyses revealed global connectedness in certain brine shrimp viruses,particularly among Asia and Northern America.This highlights the incredible species diversity of viruses in these ancient species and provides essential data for the prevalence of RNA viruses in the global aquaculture industry.More broadly,these findings provide novel insights into the previously unrecognized RNA virosphere in hypersaline ecosystems worldwide and demonstrate that human activity might have driven the global connectedness of brine shrimp viruses.

关键词： brine shrimp Artemia virus diversity novel virus discovery global connectedness hypersaline ecosystem

Adsorption behavior of activated carbon for the elimination of zearalenone during bleaching process of corn oil

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Grain & Oil Science and Technology 2023年第1期6卷 24-33页

作者： Yuyuan Hu Chuanguo Ma weifeng huang Shujing Guo Tong Wang Jun Liu College of Food Science and Engineering Henan University of TechnologyZhengzhou 450001China National Engineering Research Center of Wheat and Corn Further Processing Henan University of TechnologyZhengzhou 450001China

Zearalenone is a mycotoxin produced by Fusarium species.It frequently contaminates cereals used for foods or animal feeds,especially deposited in crude corn oil.Certain amounts of zearalenone can be removed during refining processes.In this study,we studied the influence of activated carbon and six industial absorbents(zeolite,diatomite,attapulgite,perlite,montmorillonite and activated clay)on the elimination of zearalenone during bleaching process of corn oil and explored the absorption mechanism of activated carbon.Results showed that activated carbon had an excellent adsorption capacity of zearalenone compared with the other six industrial adsorbents.For activated carbon,a high removal rate of zearalenone(exceeding 83%)from heavily zearalenone-polluted corn oil was achieved and the removal rate of zearalenone was kept above 60%after five regeneration cycles.The research on the adsorption mechanism of activated carbon showed that Freundlich adsorption isotherm model and pseudo-second-order kinetic model could well described the adsorption process.The thermodynamic study demonstrated that adsorption process was spontaneous and exothermic.Fourier transform infrared spectroscopy and Raman spectroscopy further revealed that activated carbon was effectively combined with zearalenone viaπ-πinteraction.Thus,activated carbon is an efficient and suitable adsorbent to control the levels of zearalenone during bleaching process of corn oil.This study not only proposed a systematic research scheme for the mechanism study of activated carbon for the elimination of zearalenone in corn oil,but also provided the scientific basis for developing effective methods to eliminate zearalenone in refined vegetable oils.

关键词： Zearalenone Adsorbents Activated carbon Adsorption kinetics Corn oil

Dynamical investigation of tunable magnetism in Au@Ni-carbide nanocrystals by a combined soft and hard X-ray absorption spectroscopy

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Nano Research 2022年第5期15卷 4320-4326页

作者： weifeng huang Jianxin Kang Tingwen Chen Dawei Pang Lihua Wang Hang Wei Changchun Yang Dongfeng Zhang Lin Guo College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China School of Electronic Engineering Jiujiang UniversityJiujiang 332005China School of Chemistry Beihang UniversityBeijing 100191China Institute of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100124China

Nickel based magnetic nanocrystals have been widely applied in magnetic and catalytic facilities.Tunable magnetic properties of nickel can be easily obtained via non-magnetic doping or phase transformation.However,phase transformation from face centered cubic(fcc)to hexagonal close packed(hcp)induced magnetism adjustment of Ni are always confused with nickel carbide(Ni_(3)C),due to the similar atomic structures of hcp-Ni and Ni3C.Here,we present series of Au@Ni-carbide magnetic materials achieved from the controlled carbonation of Au@Ni core-shell structures,whose magnetism is tunable by adjusting the amount of carbon in the Ni layer.Ex-situ hard X-ray absorption spectroscopy(XAS)at the metal K edge and soft XAS at both metal L edge and carbon K edge provide solid evidence for the carbonation process from fcc-Ni to Ni_(x)C,rather than phase transformation to hcp-Ni.Further investigation reveals that the magnetism of the hybrids is mainly contributed from the residual fcc-Ni.The result represents an accurate and effective way to distinguish hexagonal Ni_(3)C from hcp-Ni,and provides the pathway to control magnetism of Ni-based materials for applications.

关键词： X-ray absorption spectroscopy soft X-ray absorption spectroscopy carbide nickel carbonation process magnetism

Rigid–flexible hybrid surfaces for water-repelling and abrasionresisting

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Friction 2023年第4期11卷 635-646页

作者： Songtao HU weifeng huang Jinbang LI Tom REDDYHOFF Xiaobao CAO Xi SHI Zhike PENG Andrew DEMELLO Daniele DINI State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China School of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK Department of Chemistry and Applied Biosciences ETH ZurichZurich 8093Switzerland School of Mechanical Engineering Ningxia UniversityYinchuan 750021China

Droplets impacting solid superhydrophobic surfaces is appealing not only because of scientific interests but also for technological applications such as water-repelling.Recent studies have designed artificial surfaces in a rigid–flexible hybrid mode to combine asymmetric redistribution and structural oscillation water-repelling principles,resolving strict impacting positioning;however,this is limited by weak mechanical durability.Here we propose a rigid–flexible hybrid surface(RFS)design as a matrix of concave flexible trampolines barred by convex rigid stripes.Such a surface exhibits a 20.1%contact time reduction via the structural oscillation of flexible trampolines,and even to break through the theoretical inertial-capillary limit via the asymmetric redistribution induced by rigid stripes.Moreover,the surface is shown to retain the above water-repelling after 1,000 abrasion cycles against oilstones under a normal load as high as 0.2 N·mm−1.This is the first demonstration of RFSs for synchronous waterproof and wearproof,approaching real-world applications of liquid-repelling.

关键词： surface droplet impact hydrophobic abrasion