检索结果-南通市图书馆

Characterisation of the g.anular dynamics at the interface between a pipe and a g.anular flow in a rotating.drum

Particuolog. 2024年第3期86卷 117-125页

作者： Francois Rioual Paule Emmanuelle Eva g.ehe research Unit FRISE National Research Institute for Agriculture Food and the Environment1 Rue Pierre Gilles De Gennes92160AntonyFrance

A new mobile bed heat exchang.r is presented in this work which is composed of a flowing.g.anular material in a rotating.drum and a cylindrical pipe with potential interest in different energy applications as cooling.heating.or heat recovery *** optimal desig. of the device requires a characterisation of the phenomena involved at the interface between the g.anular flow and the *** process is modelled by the discrete element method and a g.obal classification of the flow patterns around the pipe is presented with respect to the three main control parameters of the problem:the Froude number,the diameter ratio and the relative filling.heig.t of the *** second part is devoted to the characterisation of the structure of the flow at the interface(velocity field,density field)in particular in a so-called Biflow reg.me where g.anular motion occurs above as well as below the pipe which is favourable to transfer by convection.A typical behavior at the interface with the pipe consists of a zone I with hig. velocities of particles at the top of the pipe,a second zone with quasistatic particles or low velocity particles at the front and at the bottom of the pipe and a last zone ll of depletion of particles at the back of the *** Froude number has a limited effect on the features of this structure on the first layer in the rang. of Froude numbers considered whereas the relative heig.t is a more determinant parameter to control the relative mag.itude of velocities in zone I and zone Il as well as the extent of the depletion *** first hydrodynamical characterisation can shed lig.t on the dynamical reg.mes with improved transfer between the particles and the pipe boundary.

关键词： g.anular flow Transfer Heat exchang. Mobile bed Boundary condition

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Non-synchronous vibration of rotor blade in a six-stag. transonic compressor

引用

Chinese Journal of Aeronautics 2024年第8期37卷 36-48页

作者： Rong.ui CHENg.Zhuo WANg.Huawei YU Lin DU Yi ZHANg.Xiaofeng.SUN Aeroeng.ne research {1. Beihang UniversityBeijing 102206China School of energy and Power Eng.neering Beihang UniversityBeijing 102206China

This paper presents an experimental study on the Non-Synchronous Vibration(NSV)in a six-stag. transonic *** first part of the paper describes the NSV phenomenon of Rotor 1.which occurs when both Stator 1.S1.and Stator 2(S2)or S1.only are *** measurements and analysis are carried out for the former case throug. the unsteady wall pressure and the Blade Strain(BS).The spinning.mode theory used in the rotor/stator interaction noise is employed to explain the relation between the circumferential wave number of the aerodynamic disturbance and the Nodal Diameter(ND)of the blade *** variations of the vibration amplitudes of different blades and the Inter-Blade Phase Ang.es(IBPAs)at different moments sug.est that the evolution of NSV is a hig.ly nonuniform phenomenon along.the circumferential *** addition,the difference between the wall-pressure spectra g.nerated by the NSV and the classic flutter has been *** the second part,the variations of aerodynamic loading.due to the adjustment of the stag.ers of the Inlet g.ide Vane(Ig.),S1.and S2 have been *** is found that closing.S1.only can result in a g.eat fluctuation to the performance of the front stag.s,which mig.t be detrimental to the flow org.nization and increase the risk of *** contrast,the effect of closing.S2 only on the performance of the first two stag.s appears to be slig.ter relatively.

关键词： Transonic compressor Non-synchronous vibration Modal analysis Aerodynamic loading Nodal diameter

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Thermal oxidation description methodolog. of thermal barrier coating. on g.s turbine blades considering.service characteristics

引用

Chinese Journal of Aeronautics 2024年第6期37卷 410-424页

作者： Qiannan TAO Yanrong.WANg.Dasheng.WEI Shun YANg School of energy and Power Eng.neering Beihang UniversityBeijing 100191China Jiang.i research {1. of Beihang.University Nanchang 330096China

Predicting.the thickness of Thermally g.own Oxide(Tg.)and the residual stresses induced by Tg. g.owth in the Thermal Barrier Coating.(TBCs)is sig.ificant work in analyzing.the failure of *** practical applications,the operating.temperature,oxyg.n partial pressure,aluminium content in TBCs,and porosity of the topcoat affect the oxidation ***,a novel oxidation rate model is proposed to describe the effect of such *** parameters in the proposed model were fitted with isothermal deg.adation test data from prior ***,a method for calculating.the residual stress in a disk-shaped specimen was developed based on the oxidized g.owth strain model and the oxidized ***,a variable-temperature oxidation experiment was performed to validate the new oxidation *** averag. error between the predicted and experimental thicknesses is approximately 1.%,and the averag. error between the residual stresses is 30%.Under the variable-temperature condition,the error between the predicted thickness and the averag. experimental thickness is 3.9%.

关键词： Thermal barrier coating. Oxidation g.s turbine Residual stresses Sintering

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Customized modulation on plasma uniformity by non-uniform mag.etic field in capacitively coupled plasma

引用

Plasma Science and Technolog. 2024年第6期26卷 79-87页

作者：王森张权治马方方 Maksudbek YUSUPOV 王友年 School of Physics Dalian University of TechnologyDalian 116024People’s Republic of China Laboratory of Thermal Physics of Multiphase Systems Arifov Institute of Ion-Plasma and Laser TechnologiesAcademy of Sciences of UzbekistanTashkent 100125Uzbekistan Department of Power Supply and renewable {1. Sources National Research University TIIAMETashkent 100000Uzbekistan

A two-dimensional fluid model based on COMSOL Multiphysics is developed to investig.te the modulation of static mag.etic field on plasma homog.neity in a capacitively coupled plasma(CCP)chamber. To g.nerate a static mag.etic field, direct current is applied to a circular coil located at the top of the chamber. By adjusting.the mag.etic field's config.ration, which is done by altering.the coil current and position, both the plasma uniformity and density can be sig.ificantly modulated. In the absence of the mag.etic field, the plasma density exhibits an inhomog.neous distribution characterized by hig.er values at the plasma edg. and lower values at the center. The introduction of a mag.etic field g.nerated by coils results in a sig.ificant increase in electron density near the coils. Furthermore, an increase in the sets of coils improves the uniformity of the plasma. By flexibly adjusting.the positions of the coils and the applied current,a substantial enhancement in overall uniformity can be achieved. These finding. demonstrate the feasibility of using.this method for achieving.uniform plasma densities in industrial applications.

关键词： COMSOL capacitively coupled plasma plasma uniformity mag.etic field

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A three-dimensional inverse method based on moving.no-slip boundary for profiled end wall desig.

引用

Chinese Journal of Aeronautics 2024年第10期37卷 221-233页

作者： Hanwen g.O Dong.ai JIN Jiancheng.ZHANg.Xing.in g.I School of energy and Power Eng.neering Beihang UniversityBeijing 100191China Jiang.i research {1. of Beihang.University Nanchang 330096China

How to utilize existing.flow control mechanisms to make profiled end wall desig. more flexible,efficient,and physical is a meaning.ul *** study presents a three-dimensional inverse method for profiled end wall desig. to achieve the application of flow control *** predetermined pressure distribution on the end wall is reached by modifying.the end wall g.ometry during.flow field calculation.A motion velocity model is derived from the normal momentum equation of the moving.no-slip boundary to modify the end wall g.ometry.A Reynolds-Averag.d Navier-Stokes(RANS)solver based on the Semi-Implicit Method for Pressure Linked Equations(SIMPLE)alg.rithm is adopted to simulate the flow *** on the mechanism understanding.obtained throug. numerical optimization results,this study adopts the inverse method to redesig. an optimized end wall in a compressor *** results indicate that the redesig.ed end wall exhibits better loss reduction,reducing.the overall total pressure loss by 5.5%,whereas the optimized end wall reduces it by 3%.The inverse method allows the imposition of desired influences on the end wall flow without constructing.a database,making.it hig.ly flexible,efficient,and physical.

关键词： Compressor Flow control Corner separation Profiled end wall Inverse method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Evaluation of the dynamic sealing.performance of cap rocks of underg.ound g.s storag. under multi-cycle alternating.loads

Energy Geoscience

引用

energy g.oscience 2024年第4期5卷 125-132页

作者： Lidong.Mi Yandong.g.o Yanfeng.Li Daqian Zeng.Chunhua Lu g.ang.uan Zhang research {1. of Petroleum Exploration and Production SINOPECBeijing100083China Shanxi institute of {1. TaiyuanShanxi030600China

The static sealing.of underg.ound g.s storag.(Ug.),including.the integ.ity of cap rocks and the stability of faults,is analyzed from a macro perspective using.a comprehensive g.olog.cal evaluation *** in pore structure,permeability,and mechanical streng.h of cap rocks under cyclic loads may impact the rock sealing.integ.ity during.the injection and recovery phases of *** this work,the mechanical deformation and failure tests of rocks,as well as rock damag. tests under alternating.loads,are conducted to analyze the chang.s in the streng.h and permeability of rocks under multiple-cycle intense injection and recovery of ***,this study proposes an evaluation method for the dynamic sealing.performance of Ug. cap rocks under multi-cycle alternating.*** finding. sug.est that the failure streng.h(70%)can be used as the critical value for rock failure,thus providing.theoretical support for determining.the upper limit of operating.pressure and the number of injection-recovery cycles for the safe operation of a Ug. system.

关键词： Alternating.load Cap rock Dynamic sealing.performance Underg.ound g.s storag.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bayesian inference-based wear prediction method for plain bearing. under stationary mixed-friction conditions

引用

Friction 2024年第6期12卷 1272-1282页

作者： Florian KÖNIg.Florian WIRSINg.g.org.JACOBS Rui HE Zhig.ng.TIAN Ming.J.ZUO institute for Machine Elements and Systems Eng.neering RWTH Aachen UniversityAachen 52062Germany Department of Mechanical Eng.neering University of AlbertaEdmonton T6G1H9Canada Qing.ao International Academician Park research {1. Qingdao 266000China

This study introduces a method to predict the remaining.useful life(RUL)of plain bearing. operating.under stationary,wear-critical *** this method,the transient wear data of a coupled elastohydrodynamic lubrication(mixed-EHL)and wear simulation approach is used to parametrize a statistical,linear deg.adation *** method incorporates Bayesian inference to update the linear deg.adation model throug.out the runtime and thereby consider the transient,system-dependent wear prog.ession within the RUL prediction.A case study is used to show the suitability of the proposed *** results show that the method can be applied to three distinct types of post-wearing.in behavior:wearing.in with subsequent hydrodynamic,stationary wear,and prog.essive wear *** hydrodynamic operation leads to an infinite lifetime,the method is successfully applied to predict RUL in cases with stationary and prog.essive wear.

关键词： plain bearing. wear modeling remaining.useful life prediction Bayesian inference

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Quantum confinement of carriers in the type-I quantum wells structure

引用

Chinese Physics B 2024年第9期33卷 553-558页

作者： Xinxin Li Zhen Deng.Yang.Jiang.Chunhua Du Haiqiang.Jia Wenxin Wang.Hong.Chen Key Laboratory for renewable {1. Beijing Key Laboratory for New Energy Materials andDevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChineseAcademy of SciencesBeijing 100190China Center of Materials and Optoelectronics Eng.neering University of Chinese Academy ofSciencesBeijing 100049China The Yang.ze River Delta Physics research Center Liyang 213000China Song.han Lake Materials Laboratory Dongguan 523808China

Quantum confinement is recog.ized to be an inherent property in low-dimensional ***,it is believed that the carriers trapped within the well cannot escape due to the discrete energy ***,our previous {1. has revealed efficient carrier escape in low-dimensional structures,contradicting.this conventional *** this study,we review the energy band structure of quantum wells along.the g.owth direction considering.it as a superposition of the bulk material dispersion and quantization energy dispersion resulting.from the quantum confinement across the whole Brillouin *** accounting.for all wave vectors,we obtain a certain distribution of carrier energy at each quantized energy level,g.ving.rise to the energy *** results enable carriers to escape from the well under the influence of an electric ***,we have compiled a comprehensive summary of various energy band scenarios in quantum well structures relevant to carrier *** a new interpretation holds sig.ificant value in deepening.our comprehension of low-dimensional energy bands,discovering.new physical phenomena,and desig.ing.novel devices with superior performance.

关键词： energy band quantum confinement type-I quantum wells low-dimensional structures

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Three-dimensionally ordered macroporous(3DOM) structure promoted the activity and H_(2)O poisoning.resistance of Ce Mn/3DOM-TiO_(2) catalyst in NH_(3)-SCR

引用

Journal of Rare Earths 2024年第3期42卷 523-533,I0004页

作者： Yaqin Hu Shipeng.Ding.Chenchen Tan Peng.Wu g.obo Li Sheng.Wang.Hong.iang.Yang.Yaping.Zhang Key Laboratory of energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing210096China State Power Environmental Protection research {1. Nanjing210031China

NH_(3)-SCR is an effective mean of NOxremoval in the non-electric industry, however, the hig. activation temperature and poor H_(2)O resistance of SCR catalysts posed a barrier to its application. In this work, a series of three-dimensionally ordered macroporous(3DOM) catalysts were synthesized via a colloidal crystal template(CCT) method, and various characterizations were carried out to explore the physicochemical property of catalysts. The experiment results reveal that Ce_(0.2)Mn_(0.2)/3DOM-TiO_(2) catalyst presents the excellent low-temperature catalytic activity of nearly 1.0% at 1.0℃. Furthermore, the enhanced H_(2)O resistance is achieved, certified by the unaffected NO remove at 1.0℃ in the participation of 1. vol% H_(2)O. The characterizations results exhibit that the improved dispersion of the active component and enhanced redox ability are conducive to the low-temperature catalytic activity. N_(2) adsorption and desorption experiments indicate that catalyst with 3DOM support possesses a larg.r pore diameter and specific surface area, which may weaken the condensation of H_(2)O in the microporosity of catalysts and improved the H_(2)O resistance of the catalyst. In situ DRIFTS results manifest that Ce_(0.2)Mn_(0.2)/3DOM-TiO_(2) catalyst could not only absorb more NH_(3) and g.nerate more surface-active sites, but inhibit the competitive adsorption between H_(2)O and SCR reactants.

关键词： 3DOM material NH_(3)-SCR H_(2)O resistance Low-temperature Cerium Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Functional Optical Fiber Sensors Detecting.Imperceptible Physical/Chemical Chang.s for Smart Batteries

引用

Nano-Micro Letters 2024年第8期16卷 268-308页

作者： Yiding.Li Li Wang.Youzhi Song.Wenwei Wang.Cheng.Lin Xiang.ing.He institute of Nuclear and New {1. Technolog. Tsinghua UniversityBeijing 100084People’s Republic of China National Eng.neering.research Center of Electric Vehicles Beijing Institute of Technology(BIT)Beijing 100081People’s Republic of China Shenzhen Automotive research {1. of BIT(Shenzhen research {1. of National Eng.neering.research Center of Electric Vehicles) Shenzhen 518118People’s Republic of China

The battery technolog. prog.ess has been a contradictory process in which performance improvement and hidden risks *** the battery is still a“black box”,thus requiring.a deep understanding.of its internal *** battery should“sense its internal physical/chemical conditions”,which puts strict requirements on embedded sensing.*** paper summarizes the application of advanced optical fiber sensors in lithium-ion batteries and energy storag. technolog.es that may be mass deployed,focuses on the insig.ts of advanced optical fiber sensors into the processes of one-dimensional nano-micro-level battery material structural phase transition,electrolyte deg.adation,electrode-electrolyte interface dynamics to three-dimensional macro-safety *** paper contributes to understanding.how to use optical fiber sensors to achieve“real”and“embedded”*** the inherent advantag.s of the advanced optical fiber sensor,it helps clarify the battery internal state and reaction mechanism,aiding.in the establishment of more detailed *** advancements can promote the development of smart batteries,with sig.ificant importance lying.in essentially promoting.the improvement of system ***,with the help of smart batteries in the future,the importance of consistency can be weakened or even *** application of advanced optical fiber sensors helps comprehensively improve the battery quality,reliability,and life.

关键词： Smart battery Advanced embedded optical fiber sensor Battery internal physical/chemical state Quality-reliability-life characteristic

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：