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Influence of Real Gas Properties on Aerodynamic Losses in a Supercritical CO_(2) Centrifugal Compressor

Journal of Thermal Science 2024年第6期33卷 2032-2046页

作者： yang mingyang CAI Ruikai ZHUGE Weilin yang Bijie ZHANG yangjun School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Vehicle and Mobility State Key Laboratory of Intelligent Green Vehicle and MobilityTsinghua UniversityBeijing 100084China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK

Supercritical carbon dioxide(SCO_(2))centrifugal compressor is a key component of a closed Brayton cycle system based on SCO_(2).A comprehensive understanding of the loss mechanism within the compressor is vital for its optimized ***,the physical properties of SCO_(2) are highly nonlinear near the critical point,and the internal flow of the compressor is closely related to its properties,which inevitably influences the generation of aerodynamic losses within the *** paper presents a comprehensive investigation of the compressor's loss mechanism with an experimentally validated numerical *** real gas model of CO_(2) embodied in the Reynolds-Averaged Navier-Stokes(RANS)model was used for the ***,the numerical simulation method was validated against the experimental results of Sandia SCO_(2) ***,performance and loss distribution of the compressor were compared among three fluids including SCO_(2),ideal CO_(2)(ICO_(2))and ideal air(IAir).The results showed that the performance of SCO_(2) was comparable to IAir under low flow coefficient,however markedly inferior to the other two fluids at near choke *** distribution among the three fluids was *** the impeller,SCO_(2) was the most inefficient,followed by ICO_(2) and *** discrepancies were magnified as the flow coefficient *** is due to a stronger Blade-to-Blade pressure gradient that intensifies boundary layer accumulation on walls of the shroud/***,owing to the reduced sonic speed of SCO_(2),a shock wave appears earlier at the throat region and SCO_(2) encounters more intenseboundarylayerseparation.

关键词： SCO_(2) centrifugal compressor loss mechanism real gas properties

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Overview of boosting options for future downsized engines

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Science China(Technological Sciences) 2011年第2期54卷 318-331页

作者： RICARDO Martinez-Botas APOSTOLOS Pesiridis yang mingyang Imperial College London Exhibition Road London SW7 2AZ UK Tsinghua University Beijing 100084 China

Driven by a demand for better fuel economy and increasingly stringent emissions regulations over a wide range of customers and applications,engine manufacturers have turned towards engine downsizing as the most potent enabler to meet these *** boosting systems becoming ever more numerous as the technical solutions to complex boosting requirements of the internal combustion engine increase,it is time for an overview of available and under development boosting technologies and systems and for a discussion of their relevance to downsizing *** presented analysis shows that there are no standard solutions for all the different applications as the trends indicate a rising complexity to meet with the extreme boosting requirements predicted for the remainder of the *** trends include variable geometry,a shift from single to two(or more)stages,extensive actuation for bypassing exhaust flows,exhaust flow regulation and pulsating exhaust energy recovery, severe electrification and an extensive effort downstream from the turbine to capture waste heat after the principal turbo- charger/supercharger system.

关键词： engine downsizing boosting technologies boosting system

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Flow Loss Mechanism in a Supercritical Carbon Dioxide Centrifugal Compressor at Low Flow Rate Conditions

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Journal of Thermal Science 2024年第1期33卷 114-125页

作者： yang Zimu JIANG Hongsheng ZHUGE Weilin CAI Ruikai yang mingyang CHEN Haoxiang QIAN Yuping ZHANG yangjun State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

With the advantages of high efficiency and compact structure,supercritical carbon dioxide(sC02)Brayton cycles have bright prospects for development in energy conversion *** one of the core components of the power cycle,the centrifugal compressor tends to operate near the critical point(304.13 K,7.3773 MPa).Normally,the compressor efficiency increases as the inlet temperature *** the inlet temperature is close to the critical point,the density increases sharply as the temperature decreases,which results in quickly decreasing of volume flow rate and efficiency *** flow loss mechanism of the sCO_(2) compressor operating at low flow rate is studied in this *** fluid dynamics(CFD) simulations for sCO_(2)compressor were carried out at various inlet temperatures and various mass flow *** the sCO_(2)compressor operates at low volume flow rate,the flow loss is generated mainly on the suction side near the trailing edge of the *** flow loss is related to the counterclockwise vortexes generated on the suction side of the main *** vortexes are caused by the flow separation in the downstream region of the impeller passage,which is different from air compressors operating at low flow *** reason for this flow separation is that the effect of Coriolis force is especially severe for the sCO_(2) fluid,compared to the viscous force and inertial *** lower flow rates,with the stronger effect of Coriolis force,the direction of relative flow velocity deviates from the direction of radius,resulting in its lower radial *** lower radial relative flow velocity leads to severe flow separation on the suction side near the trailing edge of the main blade.

关键词： supercritical CO_(2) centrifugal compressor flow loss mechanism Coriolis force

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Electrochemical Property Bundles with of Manganese Oxide Nanobelt Layered Structure

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Chinese Journal of Chemistry 2012年第2期30卷 299-302页

作者： Kang,Liping Jiang,Yishu Tang,Xiuhua yang,mingyang Liu,Zonghuai Education Ministry Key Laboratory of Applied Surface and Colloid Chemistry School of Chemistry and Materials ScienceShaanxi Normal UniversityXi'anShaanxi 710062China The High School Affiliated to Northwest University Xi'anShaanxi 710069China

One-dimensional manganese oxide nanobelt bundles with birnessite-type structure have been synthesized by a hydrothermal process in a NaOH solution employing K-type layered manganese oxide as a precursor. The obtained manganese oxide nanobelt bundles exhibit excellent discharge properties and cycle stability. The initial capacity is 376 mAh-g-1 and the reversible capacity of 243 mAhog-1 is maintained after the 50th cycle at a current density of 20 mA·g-t. Meanwhile, the manganese oxide nanobelt bundles show an excellent cycle performance even if at relative high current density.

关键词： nanobelt bundle hydrothermal synthesis charge-discharge performance current density

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NudCL2 is required for cytokinesis by stabilizing RCC2 with Hsp90 at the midbody

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Protein & Cell 2024年第10期15卷 766-782页

作者： Xiaoyang Xu Yuliang Huang Feng yang Xiaoxia Sun Rijin Lin Jiaxing Feng mingyang yang Jiaqi Shao Xiaoqi Liu Tianhua Zhou Shanshan Xie Yuehong yang Department of Cell Biology Institute of Gastroenterology of the Second Affliated HospitalZhejiang University School of MedicineHangzhou 310009China Research Center for Children's Health and Innovation Binjiang Institute of Zhejiang UniversityHangzhou 310053China Department of Biochemistry Purdue UniversityWest LafayetteIN 47907United States Cancer Center Zhejiang UniversityHangzhou 310058China Center for RNA Medicine International Institutes of Medicinethe Fourth Affliated Hospital of Zhejiang University School of MedicineYiwu 322000China Children's Hospital Zhejiang University School of MedicineNational Clinical Research Center for Child HealthHangzhou 310052China

Cytokinesis is required for faithful division of cytoplasmic components and duplicated nuclei into two daughter ***,a protein-dense organelle that forms at the intercellular bridge,is indispensable for success-ful ***,the regulatory mechanism of cytokinesis at the midbody still remains ***,we unveil a critical role for NudC-like protein 2(NudCL2),a co-chaperone of heat shock protein 90(Hsp90),in cytokinesis regulation by stabilizing regulator of chromosome condensation 2(RCC2)at the midbody in mam-malian ***2 localizes at the midbody,and its downregulation results in cytokinesis failure,multinu-cleation,and midbody *** iTRAQ-based quantitative proteomic analysis,we find that RCC2 levels are decreased in NudCL2 knockout(KO)***,Hsp90 forms a complex with NudCL2 to stabilize RCC2,which is essential for ***2 depletion mirrors phenotypes observed in NudCL2-downregulated ***,ectopic expression of RCC2 rescues the cytokinesis defects induced by NudCL2 deletion,but not vice ***,our data reveal the significance of the NudCL2/Hsp90/RCC2 pathway in cytokinesis at the midbody.

关键词： cytokinesis midbody NudCL2 Hsp90 RCC2

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Research and development on transonic compressor of high pressure ratio turbocharger for vehicle internal combustion engines

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Science China(Technological Sciences) 2010年第7期53卷 1817-1823页

作者： ZHENG XinQian, ZHANG yangJun & yang mingyang State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China 1. State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing 100084 China

The pressure ratio required for a turbocharger centrifugal compressor increases with internal combustion engine power density. High pressure ratio causes a transonic flow field at the impeller inducer. Transonic flow narrows the stable flow range and de-teriorates stage efficiency. In this work, an advanced high pressure ratio transonic compressor was designed. The experimental results show that the maximum pressure ratio of this turbocharger is about 4.2, the maximum efficiency is above 80% and the stable flow range at the designed rotating speed is up to 34%. A turbocharger with this transonic compressor has been applied to some vehicle research actually, and improved power density by 40%.

关键词： turbocharger internal combustion (IC) engine compressor high pressure ratio transonic

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Facile electrodeposition of 3D concentration-gradient Ni-Co hydroxide nanostructures on nickel foam as high performance electrodes for asymmetric supercapacitors

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Nano Research 2015年第8期8卷 2744-2754页

作者： mingyang yang Hua Cheng Yingying Gu Zhifang Sun Jing Hu Lujie Cao Fucong Lv Minchan Li Wenxi Wang Zhenyu Wang Shaofei Wu Hongtao Liu Zhouguang Lu Department of Materials Science and Engineering South University of Science and Technology of China Shenzhen 518055 China College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

Novel three-dimensional （3D） concentration-gradient Ni-Co hydroxide nanostructures （3DCGNC） have been directly grown on nickel foam by a facile stepwise electrochemical deposition method and intensively investigated as binder- and conductor-free electrode for supercapacitors. Based on a three- electrode electrochemical characterization technique, the obtained 3DCGNC electrodes demonstrated a high specific capacitance of 1,760 F·g^-1 and a remarkable rate capability whereby more than 62.5% capacitance was retained when the current density was raised from 1 to 100 A·g^-1. More importantly, asymmetric supercapacitors were assembled by using the obtained 3DCGNC as the cathode and Ketjenblack as a conventional activated carbon anode. The fabricated asymmetric supercapacitors exhibited very promising electrochemical performances with an excellent combination of high energy density of 103.0 Wh·kg^-1 at a power density of 3.0 kW·kg^-1, and excellent rate capability-energy densities of about 70.4 and 26.0 Wh·kg^-1 were achieved when the average power densities were increased to 26.2 and 133.4 kW·kg^-1, respectively. Moreover, an extremely stable cycling life with only 2.7% capacitance loss after 20,000 cycles at a current density of 5 A·g^-1 was achieved, which compares very well with the traditional doublelayer supercapacitors.

关键词： electrodeposition concentration-gradient nickel cobalt hydroxides supercapacitors

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Pt nanodendrites with (111) crystalline facet as an efficient, stable and pH-universal catalyst for electrochemical hydrogen production

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Chinese Chemical Letters 2020年第9期31卷 2478-2482页

作者： Huifang Sun Qi Zeng Chen Ye yangguang Zhu Feiyue Chen mingyang yang Li Fu Shiyu Du Jinhong Yu Nan Jiang Jianxiong Liu Tianzhun Wu Cheng-Te Lin Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and Engineering(NIMTE)Chinese Academy of Sciences.Ningbo 315201China Shenzhen Institutes of Advanced Technology Chinese Academy of ScienceShenzhen 518055China Center of Material Science and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Laboratory of Environmental Biotechnology School of Environmental and Civil EngineeringJiangnan UniversityWuxi 214122China College of Science Henan University of TechnologyZhengzhou 10463China College of Materials and Environmental Engineering Hangzhou Dianzi UniversityHangzhou 310018China Ningbo Institute of Materials Technology and Engineering(NIMTE) Chinese Academy of SciencesNingbo 315201China

High-performance nanomaterial catalysts for hydrogen evolution reaction via electrochemical water splitting are significant to the development of hydrogen *** this work,we report a robust and highly active catalyst fabricated through direct electrochemical deposition of Pt nanodendrites at the surface of activated carbon(Pt NDs).Owing to the large elect roc he mically active area and the exposed(111) facet of Pt,Pt NDs exhibits outstanding activity towards hydrogen evolution reaction with a low requiring overpotential of 0.027 V at 10 mA/cm2 and Tafel slope of ≈22 mV/dec in acidic *** addition,the hydrogen yield of Pt NDs is 30%-45% larger than that of commercial Pt/C at the same Pt ***,Pt NDs exhibits excellent lo ng-term durability whose hydrogen production efficiency remains unchanged after six-hour hydrogen production,while the efficiency of commercial Pt/C catalyst decayed 9% under the same *** the superiority of catalytic activity and stability,this Pt NDs present great potentiality towards practical hydrogen production application.

关键词： Platinum nanodendrites Hydrogen evolution reaction Electrocatalytic activity Long-term durability pH-universal property

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Ultralow Interfacial Thermal Resistance of Graphene Thermal Interface Materials with Surface Metal Liquefaction

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Nano-Micro Letters 2023年第1期15卷 183-196页

作者： Wen Dai Xing-Jie Ren Qingwei Yan Shengding Wang mingyang yang Le Lv Junfeng Ying Lu Chen Peidi Tao Liwen Sun Chen Xue Jinhong Yu Chengyi Song Kazuhito Nishimura Nan Jiang Cheng-Te Lin Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and Engineering(NIMTE)Chinese Academy of SciencesNingbo 315201People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Institute of Advanced Technology Shandong UniversityJinan 250100People’s Republic of China Ningbo Institute of Materials Technology and Engineering(NIMTE) Chinese Academy of SciencesNingbo 315201People’s Republic of China The State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University800 Dong Chuan RoadShanghai 200240People’s Republic of China Advanced Nano-Processing Engineering Lab Mechanical Systems EngineeringKogakuin UniversityTokyo 192-0015Japan

Developing advanced thermal interface materials(TIMs)to bridge heat-generating chip and heat sink for constructing an efficient heat transfer interface is the key technology to solve the thermal management issue of high-power semiconductor *** on the ultra-high basal-plane thermal conductivity,graphene is an ideal candidate for preparing high-performance TIMs,preferably to form a vertically aligned structure so that the basal-plane of graphene is consistent with the heat transfer direction of ***,the actual interfacial heat transfer efficiency of currently reported vertically aligned graphene TIMs is far from *** addition to the fact that the thermal conductivity of the vertically aligned TIMs can be further improved,another critical factor is the limited actual contact area leading to relatively high contact thermal resistance(20-30 K mm^(2) W^(−1))of the“solid-solid”mating interface formed by the vertical graphene and the rough chip/heat *** solve this common problem faced by vertically aligned graphene,in this work,we combined mechanical orientation and surface modification strategy to construct a three-tiered TIM composed of mainly vertically aligned graphene in the middle and micrometer-thick liquid metal as a cap layer on upper and lower *** on rational graphene orientation regulation in the middle tier,the resultant graphene-based TIM exhibited an ultra-high thermal conductivity of 176 W m^(−1) K^(−1).Additionally,we demonstrated that the liquid metal cap layer in contact with the chip/heat sink forms a“liquid-solid”mating interface,significantly increasing the effective heat transfer area and giving a low contact thermal con-ductivity of 4-6 K mm^(2) W^(−1) under packaging *** finding provides valuable guidance for the design of high-performance TIMs based on two-dimensional materials and improves the possibility of their practical application in electronic thermal management.

关键词： Vertically aligned graphene Liquid metal Surface modification Thermal interface materials

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Harmonics Cancellation of Boost Converters Based on Two-Phase Sliding Mode

Harmonics Cancellation of Boost Converters Based on Two-Phas...

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第三十九届中国控制会议

作者： mingyang yang Yanmin Wang Ziming Niu School of Electrical Engineering and Automation Harbin Institute of Technology

This paper proposes a novel harmonics cancellation approach for DC-DC boost converters by using two-phase sliding mode（SM）.On the concept of multiphase SM and hysteresis modulation（HM）,the circuit topology of boost converter is extended into two parallel channels so that the two phase SM controllers can be applied for the direct ON/OFF control of *** trajectory of system state is analyzed in the neighbourhood of equilibrium state,and the influence relationship between the HM width and harmonics is *** three cases are considered and the cooperation strategy of the two SM controllers are deduced for the quantitative harmonics *** validate the proposed approach.

关键词： Boost converter Sliding mode Harmonics Hysteresis modulation

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