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2018 3rd International Conference on Automation, Mechanical and Electrical engineering (AMEE 2018)

作者： Ya-fei ZHANG Rui LUO Yi-hua DOU Mechanical Engineering College Xi'an Shiyou University Thermal Power Research Institute State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

A swirling burner with adjustable inner secondary air flaring angle is proposed and a laboratory-scale opposed-firing furnace is built. The effects of burner flaring angle on dense-dilute low-NO burning are experimentally studied. The temperature distributions along the depth and height direction of furnace are emphatically illustrated. NO emission and char burnout are compared and discussed. Experiment results indicate that under the dense-dilute burning conditions,variation of burner inner secondary air flaring promotes ignition conditions. Under different conditions of dense-dilute ratio, variation of burner flaring angle can help decreasing NO emission and improving char burnout. Finally the optimum flaring angle of swirling burner under different dense-dilute ratios is summarized in the form of curves, which could provide reference for exquisite and novel combustion adjustment.

关键词： Swirling burner Flaring angle Dense-dilute burning Coal combustion

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Current-Density Regulating Lithium Metal Directional Deposition for Long Cycle-Life Li Metal Batteries

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Angewandte Chemie 2021年第35期133卷

作者： Heng Mao Wei Yu Zhuanyun Cai Guixian Liu Limin Liu Rui Wen Yaqiong Su Huari Kou Kai Xi Benqiang Li Hongyang Zhao Xinyu Da Hu Wu Wei Yan Shujiang Ding Xi'an Key Laboratory of Sustainable Energy Materials Chemistry School of Chemistry Xi'an Jiaotong University & Shaanxi Quantong Joint Research Institute of New Energy Vehicles Power Xi'an Jiaotong University Xi'an 710049 China Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China Key Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China Department of Mechanical Engineering University of Michigan-Dearborn Dearborn MI 48128 USA Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Uncontrolled dendrite formation in the high energy density of lithium (Li) metal batteries (LMBs) may pose serious safety risks. While numerous studies have attempted to protect separators, these proposed methods fail to effectively inhibit upward dendrite growth that punctures through the separator. Here, we introduce a novel “orientated-growth” strategy that transfers the main depositional interface to the anode/current collector interface from the anode/separator interface. We placed a layer of cellulose/graphene carbon composite aerogel (CCA) between the current collector and the anode (LCL-bottom). This layer works as a charge organizer that induces a high current density and encourages Li to deposit at the anode/current collector interface. Both in situ and ex situ images of the electrode demonstrate that the anode part of the cell has been flipped; with the newly deposited particles facing the current collector and the smooth surface facing the separator. The electrode in half and full cells showed outstanding cyclic stability and rate capability, with the LCL-bottom/LFP full cell capable of maintaining 94 % of its initial capacity after 1000 cycles.

关键词： anode/separator interface depositional interface transfer lithium metal battery long cycles

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Numerical Study of the Effect of Nozzle Configuration on Supersonic Condensation Jet

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2018年第1期39卷 207-212页

作者： Zhou, Lun Liu, Jia Ma, Qiran Chong, Dao-Tong Liu, Ji-Ping Yan, Jun-Jie MOE key Laboratory of Thermal Fluid Science and Engineering Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Three-dimensional steady method was employed to simulate the condensation process of supersonic steam condensed into subcooled water pool by embedding the phase change model based on thermal equilibrium into Ansys platform. By comparing the shape of steam plume between numerical and experimental results, good agreements were observed. When steam pressure, water temperature and the diameter of nozzle throat were 300 kPa, 20℃ and 8 mm, the diameters of nozzle exit were set as 8.8, 9.6, 10.4 11.2 and 12.0 mm, respectively. The effect of nozzle pressure ratio on the shape of steam plume and the internal flow process was revealed. © 2018, Science Press. All right reserved.

关键词： Condensation

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Modulating the Electronic Metal-Support Interactions in Single-Atom Pt1−CuO Catalyst for Boosting Acetone Oxidation

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Angewandte Chemie 2022年第28期134卷

作者： Dr. Zeyu Jiang Dr. Mingjiao Tian Dr. Meizan Jing Prof. Shouning Chai Dr. Yanfei Jian Dr. Changwei Chen Prof. Mark Douthwaite Dr. Lirong Zheng Dr. Mudi Ma Prof. Weiyu Song Prof. Jian Liu Prof. Jiaguo Yu Prof. Chi He State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi P. R. China Department of Chemistry National University of Singapore Singapore 117543 Singapore Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 430074 P. R. China State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 P. R. China Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis School of Chemistry Cardiff University Cardiff CF10 3AT UK Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 P. R. China National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing 101408 P. R. China

The development of highly active single-atom catalysts (SACs) and identifying their intrinsic active sites in oxidizing industrial hazardous hydrocarbons are challenging prospects. Tuning the electronic metal-support interactions (EMSIs) is valid for modulating the catalytic performance of SACs. We propose that the modulation of the EMSIs in a Pt 1 −CuO SAC significantly promotes the activity of the catalyst in acetone oxidation. The EMSIs promote charge redistribution through the unified Pt−O−Cu moieties, which modulates the d -band structure of atomic Pt sites, and strengthens the adsorption and activation of reactants. The positively charged Pt atoms are superior for activating acetone at low temperatures, and the stretched Cu−O bonds facilitate the activation of lattice oxygen atoms to participate in subsequent oxidation. We believe that this work will guide researchers to engineer efficient SACs for application in hydrocarbon oxidation reactions.

关键词： Acetone Oxidation Electronic Metal-Support Interactions Intrinsic Mechanism Single-Atom Catalysts

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flow CONTROL EFFECT OF MICRO-CYLINDERS WITH DIFFERENT VIBRATION REGULATIONS ON HORIZONTAL AXIS WIND TURBINE

FLOW CONTROL EFFECT OF MICRO-CYLINDERS WITH DIFFERENT VIBRAT...

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第三届中国国际透平机械学术会议

作者： Ying Wang Gao-hui Li Sheng Shen Dian-gui Huang School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093 Shanghai key laboratory of multiphase flow and heat transfer of power engineering Shanghai200093

According to the flow separation of NREL Phase VI horizontal axis wind turbine blade,a new flow control method installing vibration micro-cylinder in front of the blade leading edge is *** to the actual flow condition,the fluid solid coupling simulation is conducted where two kinds of micro-cylinder vibration modes are set up,and the aerodynamic performance is numerically *** influence of vibration modes and vibration amplitude and frequency on the aerodynamic performance of horizontal axis wind turbine is *** results suggest that in the case of different stall conditions,by setting appropriate vibration micro-cylinder can effectively suppress the flow separation on wind turbine blades than installing static ***,the vibration micro-cylinder also shows obvious suppressing effect on large flow *** U∞≥13m/s,the vibration direction and vibration amplitude plays a leading role in the improvement of aerodynamic performance,and a micro-cylinder with high vibration frequency can suppress surface flow separation more quickly to achieve the optimum aerodynamic *** on calculation,when U∞=10~25m/s,by setting micro-cylinders which are close to the blade surface with suitable vibration rules,the wind energy coefficient can show increase of 86.2%,188.4%,214.1%,109.8%和120.2%,respectively,compared with those of adding static micro-cylinder or without adding micro-cylinder.

关键词： Horizontal axis wind turbine vibration micro-cylinders flow control Aerodynamic performance

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Pore-scale simulation of shale oil flow based on pore network model

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Fuel 2019年 251卷 683-692页

作者： Yongfei Yang Ke Wang Lei Zhang Hai Sun Kai Zhang Jingsheng Ma Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)) Ministry of Education Qingdao 266580 China Research Center of Multiphase Flow in Porous Media School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 China Institute of Petroleum Engineering Heriot-Watt University Riccarton Edinburgh UK

The pore-grain characteristics of shale oil reservoir rocks are complex: nano-size pore throats, multi-scale of pore size and topology, and rich in organic matter. Generally, shale oil flow in nanoporous media is significantly affected by microscopic fluid slippage and adsorption on the pore surfaces, which give rise to variable slip length, viscosity ratio of adsorbed phase to bulk phase, and thickness of adsorption layer in organic & inorganic pore throats. In this study, a new pore network model is developed based on a modified shale oil flow equation to consider those combinational effects on shale oil permeability under different organic matter contents, and then is applied to provide an order analysis of those effects on the permeability of a representative shale model. Different flow patterns characterizing fluid-solid interaction are also discussed. Analysis results show that shale oil permeability is strongly influenced by the slip length. The effect of adsorption on permeability is negligible for cases considered. Shale oil flow is mainly controlled by inorganic pores when volumetric TOC is low. The influence of TOC on permeability depends on slippage and adsorption conditions in organic and inorganic matters, referred in this paper to as flow patterns. As the organic matter content increases, the connectivity of organic pores and throats improves, which further affects network permeability.

关键词： Shale oil Pore network model Slippage Adsorption effect Connectivity

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Research on the effects of diluents and dilution ratios on laminar burning velocities and flame instabilities of hydrogen flame 11

Research on the effects of diluents and dilution ratios on l...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Lu, Xin Hu, Erjiang Li, Xiaotian Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Laminar burning velocities and flame instabilities of H2/O2/diluents mixture were studied at initial pressure of 0.3 MPa, initial temperature of 373 K and equivalence ratio of 1.0. The He diluted mixtures have the largest laminar burning velocities and the N2 diluted mixtures have the smallest, while He diluted mixtures have the largest mole fraction of H and OH radical and N2 diluted mixtures have the smallest. And laminar burning velocities fall when the dilution ratio rises, due to the mole fractions of H and OH radical fall with increasing dilution ratio. The cellular structure appeared on both N2 and Ar diluted mixture, while only wrinkles grew on He diluted mixtures. When dilution ratio rose, the appearance of cellular structure deferred. Thus, He diluted mixtures are more stable than N2 and Ar diluted mixtures, and higher dilution ratios restrain the flame instabilities. © 2017 Combustion Institute. All rights reserved.

关键词： Hydrogen

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power-Grid Dispatching Method Considering Heat-power Coupling Characteristics of CHP Units

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IOP Conference Series: Earth and Environmental Science 2020年第3期440卷

作者： Sensen Guan Kun Wang E Zhijun Qingbo Hu Shan Wang Jiuwen Fang Rong Chen Fei Lu Bangyu Yang Ming Liu Tianjin Electric Power Science & Research Institute Tianjin 300384 State Grid Tianjin Electric Power Company Tianjin 300010 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Tianjin Guodian Jinneng Binhai Co-generation co. LTD 300459.

The dispatching optimization of power grid is to obtain the greatest benefits on the basis of safe and stable operation of the power grid, which is of great significance for the energy-saving, reliability of the power grid. Therefore, a multi-objective model of power grid dispatching which considers the heat-power coupling characteristics of CHP units is developed in this study. The economic benefit and minimum wind power abandonment are taken as optimizing targets in the model. Meanwhile, the detail operation characteristics of condensing power plants and CHP units are considered in this model based on off-design models of power plant. Besides, the regional heat load and power load are scheduled together. Finally, the AHP-entropy method is used to obtain the weights of the two optimizing targets of economic benefit and wind power abandonment, and the multi-objective is converted into a single-objective.

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New model for measuring stratified gas-liquid flow by Chisholm-model-based V-cone flowmeter

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Huagong Xuebao/CIESC Journal 2018年第8期69卷 3428-3435页

作者： He, Denghui Chen, Senlin Bai, Bofeng State Key Laboratory of Eco-hydraulic in Northwest Arid Region Xi’an University of Technology Xi'anShaanxi710048 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi'anShaanxi710049 China

Large errors are usually observed when Chisholm model is used in V-cone flowmeter to measure stratified gas-liquid flow rate. Three V-cone flowmeters with throttle ratios of 0.55, 0.65 and 0.75 were used to study stratified gas-liquid flowat gas volume fraction of more than 95%. The effects of gas and liquid flow rates, operating pressure and throttle ratio on correction factor C of the Chisholm model were analyzed and new modelfor measuring stratified gas-liquid flow was developed. Correction factor C was monotonically decreased with increase of Lockhart-Martinelli, XLM, but was hardly affected by pressure and the gas densiometric Froude number. However, C was somehow affected by throttle ratio. The relationship between C and XLM was obtained and new models for three V-cone flowmeters to measure stratified flow were developed. The relative standard error of the predicted gas flow rate was with ±3.0% for V-cone flowmeters with throttle ratios of 0.55 and 0.65 under confidence level of 94.6% and 88.6%, respectively, while that was with ±4.0% under 91.7% confidence level forV-cone flowmeter with throttle ratio of 0.75. © All Right Reserved.

关键词： Two phase flow

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Fabrication of Cd1-xZnxS modified TiO2 Nanofibers and Their Photocatalytic Water Splitting Activity

Fabrication of Cd1-xZnxS modified TiO2 Nanofibers and Their ...

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中国化学会第三届中国能源材料化学研讨会

作者： Guorui Yang Ling Wang Silan Wang Jianan Wang Wei Yan Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong University Xi'an Jiaotong University Suzhou Institute

Photocatalytic water splitting for H evolution based on sunlight represents one of the most promising approaches for renewable energy ***,the hierarchically heterostructured CdZnS/TiO with visible-light response were *** found that the crystallinity of the substrate nanofinbers play a key role in promoting the photocatalytic performance.

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