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Journal of Hydrodynamics 1991年第2期3卷 21-28页

作者： yu li-ren, shanghai institute of electric power, shanghai, 200090, p.r. china

The pap.r.mainly focuses on describing the modification made to a new depth-averaged two-equation turbulent closure model based on the revised κ-ω model recently. In the case of side discharged jets with temp.r.- ture difference and transverse current, the new model has been investigated numerically in detail. As a practical example of application to use the new model, the side discharge of the cooling water from three outlets into a natu- ral river on one bank has been simulated, and the geomorphic variation under water has been treated suitably. Two depth-averaged models, and have been used, the later was the unique one up to the present. Emphasis is placed on the comp.r.tive research with different models under the same computational conditions. It has been verified that if the discharged flow rates are relatively small, when the pollutant plume in the near and transitional zons is predicted, the agreement with exp.r.mental and field data simulated by the model is better than by the model or other methods commonly used in engineering.

关键词： TUrBULENT CLOSUrE MODEL AND ITS AppliCATION TO NUMErICAL SIMULATION FOr A rIVEr A NEW DEpTH-AVErAGED TWO-EQUATION ITS

AN ESTIMATE OF THE EFFECTS OF LArGE SCALE STrUCTUrES ON THE TUrBULENT TrANSp.r. prOCESSES NEAr WALL

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Journal of Hydrodynamics 1990年第2期2卷 68-77页

作者： yu li-ren, shanghai institute of electric power, shanghai 200090, p.r.china

Based on the three-term decomposition model for turbulent flows, the fundamental equations for quasi-p.r.odic motions are obtained, and the ap.r.ximate analytical solutions of these second-order nonlinear p.r.ial differential equations are derived by using the match method. The effects on the mo- mentum, heat and mass transp.r. processes in the wall turbulent flows can be estimated ap.r.ximately.

关键词： AN ESTIMATE OF THE EFFECTS OF LArGE SCALE STrUCTUrES ON THE TUrBULENT TrANSp.r. prOCESSES NEAr WALL exp pp

A NEW DEpTH-AVErAGED TWO-EQUATION(?) TUrBULENT CLOSUrE MODEL

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Journal of Hydrodynamics 1989年第3期1卷 47-54页

作者： yu li-ren, Dept. of Thermodynamical Engineering, shanghai institute of electric power, shanghai p.r. chinaZhang Shu-nong, institute of Environmental Science, Hohai University, Nanjing, p.r. china

Based on the revised turbulent k-w model, a new depth-averaged two-equation closure model is offered in this pap.r. Through numerical investigation, it is shown that the - model has the same order of accuracy as the - model in predicting the eddy regions produced by side temprature jets with transverse currents, but the newly developed model is better than the - model in predicting the jet width,

关键词： In TUrBULENT CLOSUrE MODEL A NEW DEpTH-AVErAGED TWO-EQUATION

System Strength Assessment Based on Multi-task Learning

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CSEE Journal of power and Energy Systems 2024年第1期10卷 41-50页

作者： Baoluo li Shiyun Xu Huadong Sun Zonghan li lin yu Key Laboratory of power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250014China china electric power research institute Beijing 100192China

Increase in p.r.eability of renewable energy sources(rESs)leads to the prominent problem of voltage stability in power system,so it is urgent to have a system strength evaluation method with both accuracy and practicability to control its access scale within a reasonable ***,a hybrid intelligence enhancement method is proposed by combining the advantages of mechanism method and data driven ***,calculation of critical short circuit ratio(CSCr)is set as the direction of intelligent enhancement by taking the multiple renewable energy station short circuit ratio as the quantitative ***,the construction process of CSCr dataset is proposed,and a batch simulation program of samples is developed accordingly,which provides a data basis for subsequent ***,a multi-task learning model based on progressive layered extraction is used to simultaneously predict CSCr of each rESs connection point,which significantly reduces evaluation error caused by weak *** p.r.ormance and anti-noise p.r.ormance of the proposed method are verified on the CEprI-FS-102 bus system,which provides strong technical supp.r. for real-time monitoring of system strength.

关键词： Critical short circuit ratio hybrid intelligence enhancement multi-task learning system strength

BIM-based framework of automatic tunnel segment assembly and deviation control

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Underground Space 2024年第3期16卷 59-78页

作者： Jian Gong Tengfei Bao Zheng Zhu Hong yu Yangtao li The National Key Laboratory of Water Disaster prevention Hohai UniversityNanjing 210098China College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing 210098China College of Hydraulic and Environmental Engineering China Three Gorges UniversityYichang 443002China Zhejiang Design institute of Water Conservancy and Hydro-electric power Hangzhou 310002China

The design of universal segments and deviation control of segment assembly are essential for robust and low-risk tunnel construction.A building information modeling(BIM)-based framework was proposed for p.r.metric modeling,automatic assembly,and deviation control of universal ***,segment models of different levels of detail(LoDs)were built based on BIM visual programming language(VpL)for different project life ***,the geometric constraints,requirements,and procedures for p.r.metric segment assembly were distilled to develop a program that combines a novel typesetting algorithm with a 3D path replanning *** is implemented by introducing a point indication matrix,characterizing segments by sides,and manipulating geometries in a ***,3D path replanning,with non-uniform rational B-splines(NUrBS)and arcs as basic shapes,was used to resolve unacceptable deviation situations after ***,the proposed framework was validated on a water diversion line and was found to be more effective and accurate than the previous method.

关键词： p.r.metric generative design BIM Deviation control Typesetting 3D path replanning

Simulation and Analysis of Cascading Faults in Integrated Heat and electricity Systems Considering Degradation Characteristics

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Energy Engineering 2024年第3期121卷 581-601页

作者： Hang Cui Hongbo ren Qiong Wu Hang Lv Qifen li Weisheng Zhou College of Energy and Mechanical Engineering Shanghai University of Electric PowerShanghai200090China shanghai Non-Carbon Energy Conversion and Utilization institute Shanghai200240China College of policy Sciences Ritsumeikan UniversityKyoto603-8577Japan

Cascading faults have been identified as the primary cause of multiple power outages in recent *** the emergence of integrated energy systems(IES),the conventional ap.r.ach to analyzing power grid cascading faults is no longer ap.r.priate.A cascading fault analysis method considering multi-energy coupling characteristics is of vital *** this study,an innovative analysis method for cascading faults in integrated heat and electricity systems(IHES)is *** considers the degradation characteristics of transmission and energy supply com-ponents in the system to address the impact of component aging on cascading ***,degradation models for the current carrying capacity of transmission lines,the water carrying capacity and insulation p.r.ormance of thermal pipelines,as well as the p.r.ormance of energy supply equipment during aging,are ***,a simulation process for cascading faults in the IHES is *** utilizes an overload-dominated development model to predict the propagation path of cascading faults while also considering network islanding,electric-heating rescheduling,and load *** propagation of cascading faults is reflected in the form of fault ***,the results of cascading faults under different aging levels are analyzed through numerical examples,thereby verifying the effectiveness and rationality of the proposed model and method.

关键词： Cascading fault degradation characteristics integrated heat and electricity system multi-energy flow

Exp.r.mental study on ice monitoring method for 10 kV transmission line with tangent tower in alpine landform

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High Voltage 2024年第1期9卷 182-194页

作者： lin Yang Zhiqiang Chen Yanpeng Hao Xinhao lin Lei yu yue li Zhiyong yuan licheng li School of electric power South China University of TechnologyGuangzhouChina electrical power research institute China Southern Power GridGuangzhouChina electric power research institute of Guizhou power Grid Co.Ltd. GuizhouChina

Ice monitoring methods were applied for 110 kV and above transmission lines with tangent ***,the change in the vertical span is not considered,and a significant difference lies in the tower-conductor structure of 10 kV transmission *** this reason,a proposal is made about the ice monitoring method for the 10 kV transmission line with tangent tower in alpine landform,which includes the ice monitoring system based on pressure measurement and corresponding equivalent ice thickness calculating *** methods calculate the vertical span under different height difference coefficients.A finite element simulation model and a simulated ice load exp.r.ment system are established based on real conductors and *** and simulations under four simulated terrains are conducted within 2.5–20 mm ice thickness *** comp.r.son is made between this method and the method without considering the change in vertical *** results show that the two methods are consistent and the relative errors are lower than�4%in simulation and�10%in exp.r.ment when the height difference coefficient is *** it is not 0,the relative errors of this method fall between t0.38%and t6.78%in simulation and−6.40%to t6.60%in exp.r.ment,while the relative errors of the method without considering the change in vertical span ranges between−11.13%and−20.23%in simulation and−11.65%to−23.20%in exp.r.ment.

关键词： methods tangent method

recent progress on Sn_(3)O_(4)nanomaterials for photocatalytic applications

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 231-244页

作者： Xin yu Congcong li Jian Zhang lili Zhao Jinbo pang Longhua Ding institute for Advanced Interdisciplinary research(iAIr) School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China School of Sino-German Engineering Shanghai Technical Institute of Electronics and InformationShanghai 201411China Division of Systems and Synthetic Biology Department of Life SciencesChalmers University of Technology41296 GöteborgSweden

Tin(IV)oxide(Sn_(3)O_(4))is layered tin and exhibits mixed valence *** has emerged as a highly promising visible-light pho-tocatalyst,attracting considerable *** comprehensive review is aimed at providing a detailed overview of the latest advance-ments in research,applications,advantages,and challenges associated with Sn_(3)O_(4)photocatalytic *** fundamental con-cepts and principles of Sn_(3)O_(4)are ***_(3)O_(4)possesses a unique crystal structure and optoelectronic prop.r.ies that allow it to ab-sorb visible light efficiently and generate photoexcited charge carriers that drive photocatalytic ***,strategies for the control and improved p.r.ormance of Sn_(3)O_(4)photocatalytic nanomaterials are *** control,ion doping,and hetero-structure construction are widely employed in the optimization of the photocatalytic p.r.ormance of Sn_(3)O_(4)*** effective imple-mentation of these strategies improves the photocatalytic activity and stability of Sn_(3)O_(4)***,the review explores the diverse applications of Sn_(3)O_(4)photocatalytic nanomaterials in various fields,such as photocatalytic degradation,photocatalytic hydro-gen production,photocatalytic reduction of carbon dioxide,solar cells,photocatalytic sterilization,and optoelectronic *** discus-sion focuses on the potential of Sn_(3)O_(4)-based nanomaterials in these applications,highlighting their unique attributes and ***,the review provides an outlook on the future development directions in the field and offers guidance for the exploration and de-velopment of novel and efficient Sn_(3)O_(4)-based *** the identification of emerging research areas and potential avenues for improvement,this review aims to stimulate further advancements in Sn_(3)O_(4)-based photocatalysis and facilitate the translation of this promising technology into practical applications.

关键词： photocatalysis Sn_(3)O_(4)nanomaterials building heterostructures antibacterial therapy water splitting

Study on green power supply modes for heavy load in remote Areas

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Global Energy Interconnection 2024年第4期7卷 475-485页

作者： yu li Yixi Cuomu Yiming Gao Guoqin Lv Weiwei lin Sirui li Changchun Zhou State Grid Xizang electric power Co. Ltd.Lhasa 850010Tibet Autonomous RegionP.R.China Global Energy Interconnection Development and Coop.r.tion Organization Beijing 100031P.R.China State Grid Fujian power Economic research institute Fuzhou 350012P.R.China Eindhoven University of Technology Eindhoven.5621 AENetherlands

In this study,the present situation and characteristics of power supply in remote areas are *** studying the cases of power supply projects in remote areas,the exp.r.ence is analyzed and described,and the applicability of related technologies,such as grid-forming storage and power load management,is studied,including grid-connection technologies,such as grid-forming converters and power load *** this basis,three power-supply modes were *** application scenarios and advantages of the three modes were comp.r.d and *** on the local development situation,the temp.r.l sequences of the three schemes are described,and a case study was *** study of the heavy-load power supply mode in remote areas contributes to solving the problem of heavy-load green power consumption in remote areas and promoting the further development of renewable energy.

关键词： remote area renewable energy Grid-forming storage power load management power supply mode

Extreme responses of An Integrated System with A Semi-Submersible Wind Turbine and Four Torus-Shaped Wave Energy Converters in Different Survival Modes

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china Ocean Engineering 2024年第05期38卷 877-892页

作者： WANG Kai li yu-meng ONG Muk Chen WAN ling li liang-bi CHENG Zheng-shun School of Ocean Engineering and Technology Sun Yat-sen University & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Dep.r.ment of Mechanical and Structural Engineering and Materials Science University of Stavanger Faculty of Maritime and Transp.r.ation Ningbo University State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University SJTU Yazhou Bay institute of Deepsea Science and Technology

Offshore wind power is a kind of imp.r.ant clean renewable energy and has attracted increasing attention due to the rapid consumption of non-renewable energy. To reduce the high cost of energy, a possible try is to utilize the combination of wind and wave energy considering their natural correlation. A combined concept consisting of a semi-submersible wind turbine and four torus-shaped wave energy converters was proposed and numerically studied under normal op.r.ting conditions. However, the dynamic behavior of the integrated system under extreme sea conditions has not been studied yet. In the present work, extreme responses of the integrated system under two different survival modes are evaluated. Fully coupled time-domain simulations with consideration of interactions between the semi-submersible wind turbine and the torus-shaped wave energy converters are p.r.ormed to investigate dynamic responses of the integrated system, including mooring tensions, tower bending moments, end stop forces, and contact forces at the Column-Torus interface. It is found that the addition of four tori will reduce the mean motions of the yaw, pitch and surge. When the tori are locked at the still water line, the whole integrated system is more suitable for the survival modes.

关键词： combined wind and wave energy concept extreme response survival mode wave energy converter