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Improving Film Cooling Performance by Using One-Inlet and Double-Outlet Hole

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Journal of Thermal Science 2010年第5期19卷 430-437页

作者： guang-chao Li and wei Zhang Aeroengine and Energy Engineering College,Shenyang Areospace University Shenyang China 110136 Aeroengine and Energy Engineering College Shenyang Areospace University Shenyang China

The film cooling performance of a trunk-branch hole is investigated by numerical simulation in this paper. The geometry of the hole is a novel cooling concept, which controls the vortices-pair existing at the mink hole outlet using the injection of the branch hole. The trunk-branch holes require easily machinable round hole as compared to the shaped holes. The flow cases were considered at the blowing ratios of 0.5, 0.75, 1.0, 1.5 and 2.0. At the low blowing ratio of 0.5, the vortices-pair at the outlet of the trunk hole is reduced and the laterally coverage of the film is improved. At the high blowing ratio of 2.0, the vortices-pair is killed by the vortex which is produced by the injection of the branch hole. The flow rate of the two outlets becomes more significantly different when the blowing ratio increases from 0.75 to 2.0. The discharge coefficients increase 0.15 and the laterally averaged film effectiveness improve 0.2 as compared to the cylindrical holes. The optimal blowing ratios occur at M=1.0 or M= 1.5 according to the various locations downstream of the holes.

关键词： aerospace propulsion system gas turbine film cooling heat transfer

From waste to wealth:Coal tar residue derived carbon materials as low-cost anodes for potassium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 464-475页

作者： Zhonghua Lu Jun Shen Xin Zhang Lingcong chao Liang Chen Ding Zhang Tao wei Shoudong Xu College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China College of Chemistry Taiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan 430205China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China

Carbon materials are widely recognized as highly promising electrode materials for various energy storage system *** tar residues(CTR),as a type of carbon-rich solid waste with high value-added utilization,are crucially important for the development of a more sustainable *** this study,we employed a straightforward direct carbonization method within the temperature range of 700-1000℃to convert the worthless solid waste CTR into economically valuable carbon materials as anodes for potassium-ion batteries(PIBs).The effect of carbonization temperature on the microstructure and the potassium ions storage properties of CTR-derived carbons(CTRCs)were systematically explored by structural and morphological characterization,alongside electrochemical performances *** on the co-regulation between the turbine layers,crystal structure,pore structure,functional groups,and electrical conductivity of CTR-derived carbon carbonized at 900℃(CTRC-900H),the electrode material with high reversible capacity of 265.6m Ah·g^(-1)at 50 m A·g^(-1),a desirable cycling stability with 93.8%capacity retention even after 100 cycles,and the remarkable rate performance for PIBs were ***,cyclic voltammetry(CV)at different scan rates and galvanostatic intermittent titration technique(GITT)have been employed to explore the potassium ions storage mechanism and electrochemical kinetics of *** indicate that the electrode behavior is predominantly governed by surface-induced capacitive processes,particularly under high current densities,with the potassium storage mechanism characterized by an“adsorption-weak intercalation”*** work highlights the potential of CTR-based carbon as a promising electrode material category suitable for high-performance PIBs electrodes,while also provides valuable insights into the new avenues for the high value-added utilization of CTR.

关键词： coal tar residue carbon materials anode potassium-ion batteries high value-added

对Glauber理论的相对论修正及散射振幅的高能行为

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高能物理与核物理 1978年第4期 336-342页

作者：鲍诚光赵维勤中国科学院高能物理研究所

本文把Glauber理论的基础——薛定格方程改为一个相对论性方程,求出该方程的Eikonal解,并进一步用它探讨了散射振幅的高能行为及其与唯象核力的关系.本文还提出了对Glauber理论加横动量和纵动量改变量修正的方法.

关键词：方程相对论修正 Glauber 核力核结构散射振幅横动量

乏燃料组件燃料棒更换抓爪疲劳特性的数值分析和试验研究

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核科学与工程 2018年第1期38卷 130-134页

作者：侯硕余冰刘青松路广遥魏超丁祥彬中广核研究院有限公司广东深圳518124

本文针对乏燃料组件燃料棒更换抓爪的疲劳特性进行研究,目的在于获得燃料棒抓爪合理可靠的使用寿命。抓爪所用材料属于定制特种材料,为获取不同应力值对应的极限循环次数,拟合出该材料的S-N疲劳特性曲线,本研究中对抓爪所用材料进行了... 详细信息

本文针对乏燃料组件燃料棒更换抓爪的疲劳特性进行研究,目的在于获得燃料棒抓爪合理可靠的使用寿命。抓爪所用材料属于定制特种材料,为获取不同应力值对应的极限循环次数,拟合出该材料的S-N疲劳特性曲线,本研究中对抓爪所用材料进行了疲劳试验;而后通过ANSYS软件建立抓爪模型并施加载荷。通过S-N疲劳特性曲线数据,对ANSYS进行参数设定,获得抓爪的理论疲劳寿命;通过疲劳试验验证了乏燃料组件燃料棒更换抓爪的使用寿命。

关键词：乏燃料组件燃料棒抓爪疲劳数值分析寿命试验

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重庆市蔬菜区重金属污染现状

土壤通报 2005年第1期36卷 104-107页

作者：李其林刘光德魏朝富黄昀重庆市农业环境保护监测站重庆400020 西南农业大学重庆400716

本文通过对不同区域菜地大气污染物和灌溉水、土壤、蔬菜重金属平均含量比较发现,污染区大气污染物均大于清洁区;灌溉水和土壤重金属在不同区域差异不大;不同蔬菜品种重金属在不同区域表现不一致,叶菜类基本表现为污染区大于清洁区,说... 详细信息

本文通过对不同区域菜地大气污染物和灌溉水、土壤、蔬菜重金属平均含量比较发现,污染区大气污染物均大于清洁区;灌溉水和土壤重金属在不同区域差异不大;不同蔬菜品种重金属在不同区域表现不一致,叶菜类基本表现为污染区大于清洁区,说明叶菜类蔬菜重金属污染主要由大气污染引起。苋菜、莴笋重金属含量较高,说明富集重金属能力较强。蔬菜重金属含量同食品卫生限量标准比较表明超标蔬菜品种为苋菜、莴笋、葱子,超标重金属为Pb、Cd、Cr。同一蔬菜品种莴笋重金属Pb、Cd、Hg、As平均含量在污染点的下风向高于上风向,说明Pb、Cd、Hg、As与大气污染有直接关系。蔬菜重金属相关性分析表明Cr、Hg具有明显的协同和拮抗作用。

关键词：污染重金属蔬菜区

Record-breaking bifunctional oxygen electrocatalyst accomplished by a data-driven approach for zinc-air batteries

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Journal of Energy Chemistry 2025年第1期100卷 144-145页

作者： Deviprasath Chinnadurai Zhi wei Seh Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR)

Rechargeable zinc-air batteries(ZABs) have recently drawn great attention in energy research due to their high theoretical capacity,low costs, and inherently safe nature [1–3]. However, the sluggish cathode reactions necessitate the development of bifunctional oxygen electrocatalysts with lower ΔE indicator values. The ΔE indicator is commonly employed to quantitatively evaluate the electrocatalytic activity of a bifunctional oxygen electrocatalyst,representing the overall overpotential from oxygen reduction reaction(ORR) to oxygen evolution reaction(OER).

关键词： Data-driven approach Bifunctional oxygen electrocatalyst Record breaking performance Zinc-air batteries

Investigation of the dynamic characteristics of a dual rotor system and its start-up simulation based on finite element method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第4期14卷 268-280页

作者： Zhong-xiu FEI Shui-guang TONG chao wei Institute of Chemical Machinery Engineering Zhejiang University Mechanical Design Institute Zhejiang University Institute of Thermal Engineering and Power Systems Zhejiang University

Recently,the finite element method(FEM) has been commonly applied in the engineering analysis of rotor *** moments,rotary inertia,transverse shear deformation and gravity can be included in computational models of rotor-bearing *** this paper,a finite element model and its solution method are presented for the calculation of the dynamics of dual rotor systems.A typical structure with two rotor shafts is discussed and the procedure for obtaining the coupling motion equations of the subsystems is illustrated.A computer program is developed to solve critical speeds and to simulate the transient *** influence of gyroscopic moments on co-rotation and counter-rotation is analyzed,and the effect of the speed ratio on critical speed is *** dynamic characteristics under different conditions of increasing speed during start-up are demonstrated by comparison with transient nodal *** presented model provides a complete foundation for further investigation of the dynamics of dual rotor systems.

关键词： Dual rotor system Critical speed Transient response Finite element method(FEM)

Influence of bottom blowing oxygen on dust emission in converter steelmaking

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Journal of Iron and Steel Research International 2021年第9期28卷 1105-1113页

作者： wei-feng Li Rong Zhu chao Feng Bao-chen Han guang-sheng wei School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-end Metal Materials University of Science and Technology BeijingBeijing 100083China

With the importance of the steelmaking industry in the economy and its negative impacts on the environment,reducing dust emissions is a vital focus in this ***,the theory of dust generation in converter steelmaking process was analyzed and the influence of bottom blowing oxygen on dust generation was obtained through experimental *** industrial test was carried out in a 120-t bottom combined blown O_(2)–CaO steelmaking *** results show that lowering the lance position can reduce the amount of *** emission rate of the converter is also found to be in direct proportion to the decarburization *** a result,the proposed bottom blowing O_(2)–CaO steelmaking converter can technically reduce the amount of dust and improve the recovery rate of *** more bottom blowing oxygen,the dust content is lower with the dust peak appearing *** evaporation theory,followed by the bubble theory,plays the primary role in the dust generation of bottom blowing oxygen *** points out the direction for the technology research and development of reducing dust generation.

关键词： Steelmaking converter Dust emission Bottom blowing O_(2)-CaO Evaporation theory Bubble theory

Recent progress in constructing fluorinated solid-electrolyte interphases for stable lithium metal anodes

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 270-291页

作者： Di Zhang Pengfei Lv wei Qin Xin He Yuanhua He Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province College of Civil Aviation Safety EngineeringCivil Aviation Flight University of ChinaGuanghan 618307China School of Chemical Engineering Sichuan UniversityChengdu 610065China

Lithium metal batteries(LMBs)are emerging as a promising energy storage solution owing to their high energy density and specific ***,the non-uniform plating of lithium and the potential rupture of the solid-electrolyte interphase(SEI)during extended cycling use may result in dendrite growth,which can penetrate the separator and pose significant short-circuit *** a stable SEI is essential for the long-term operation of the ***-rich SEI has garnered significant attention for its ability to effectively passivate electrodes,regulate lithium deposition,and inhibit electrolyte *** the structural components and preparation methods of existing fluorinated SEI is crucial for optimizing lithium metal anode *** paper reviews the research on optimizing LiF passivation interfaces to protect lithium metal *** focuses on four types of compositions in fluorinated SEI that work synergistically to enhance SEI *** instance,combining compounds with LiF can further enhance the mechanical strength and ionic conductivity of the *** metals with LiF significantly improves electrochemical performance at the SEI/anode interface,with a necessary focus on reducing electron tunneling ***,incorporating polymers with LiF offers balanced improvements in interfacial toughness and ionic conductivity,though maintaining structural stability over long cycles remains a critical area for future *** alloys combined with LiF increase surface energy and lithium affinity,challenges such as dendrite growth and volume expansion *** summary,this paper emphasizes the crucial role of interfacial structures in LMBs and offers comprehensive guidance for future design and development efforts in battery technology.

关键词： LiF lithium metal anodes solid-electrolyte interphase interface cycling stability