检索结果-南通市图书馆

Analytical Model and Topology Optimization of Doubly-fed Induction Generator

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

CES Transactions on electrical Machines and Systems 2024年第2期8卷 162-169页

作者： Lu Sun Haoyu Kang Jin Wang Zequan Li Jianjun Liu Yiming Ma Libing Zhou the State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China IEEE dongfang electric Machinery co. LtdDongfang Electric CorporationDeyangChina CSG PGC Energy Storage Research Institute Southern Power Grid Energy Storage Co.LtdGuangzhou 510630China

As the co.e co.ponent of energy co.version for large wind turbines,the output performance of doubly-fed induction generators (DFIGs) plays a decisive role in the power quality of wind turbines.To realize the fast and accurate design optimization of DFIGs,this paper proposes a novel hybriddriven surrogate-assisted optimization method.It firstly establishes an accurate subdomain model of DFIGs to analytically predict performance indexes.Furthermore,taking the inexpensive analytical dataset produced by the subdomain model as the source domain and the expensive finite element analysis dataset as the target domain,a high-precision surrogate model is trained in a transfer learning way and used for the subsequent multi-objective optimization process.Based on this model,taking the total harmonic distortion of electromotive force,co.ging torque,and iron loss as objectives,and the slot and inner/outer diameters as parameters for optimizing the topology,achieve a rapid and accurate electromagnetic design for DFIGs.Finally,experiments are carried out on a 3MW DFIG to validate the effectiveness of the proposed method.

关键词： Doubly-fed induction generators Accurate subdomain model Surrogate-assisted Transfer learning

Thermochemical deco.position of phosphogypsum with Fe-P slag via a solid-state reaction

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第7期35卷 113-119页

作者： Lei Sun Zhongjun Zhao Xiushan Yang Yan Sun Quande Li Chunhui Luo Qiang Zhao School of Chemical Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Chengdu UniversityChengdu 610106China State Key Laboratory of Long-Life High Temperature Materials Deyang 618000China dongfang electric corporation dongfang turbine co. LtdDeyang 618000China

Phosphogypsum is a solid waste sourced from the wet-process phosphoric acid industry,which causes severe environmental damages.Its utilization was limited by its high deco.position temperature and high energy co.sumption.Herein,an Fe-P slag,which is a solid waste that mainly co.prises iron phosphide(FeP)and diiron phosphide(Fe_(2)P),can dramatically decrease the deco.position temperature of phosphogypsum.It was found that the Fe-P slag and CaSO_(4) can react as shown in the following reaction equation:2Fe_(1.5)P+3CaSO_(4)+6co.(2)→Ca_(3)(PO_(4))_(2)+Fe_(3)O_(4)+3SO_(2)+6co.Its reaction mechanism was further determined using the thermodynamic method.It was found that CaS was the key intermediate for this reaction.The CaSO_(4) co.version for this method can reach approximately 97%under the optimized roasting co.ditions:the molar ratio between Fe_(1.5) P and CaSO_(4) of 2:3,roasting temperature of 900℃,a roasting time of 8 h.

关键词： Phosphogypsum Deco.position Mechanism Thermodynamic Roasting co.ditions

A co.prehensive study on the oxidation behavior and failure mechanism of(γ’+β)two-phase Ni-34Al-0.1Dy co.ting treated by laser shock processing

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第31期162卷 131-144页

作者： Bangyang Zhou Qijie Zhou Jian He Wei Wang Hongbo Guo School of Materials Science and Engineering Beihang University(BUAA)Beijing 100191China Research Institute for Frontier Science Beihang University(BUAA)Beijing 100191China Key Laboratory of High-Temperature Structural Materials&co.tings Technology(Ministry of Industry and Information Technology) Beihang University(BUAA)Beijing 100191China State Key Laboratory of Long-Life High Temperature Materials Deyang 618000China dongfang electric corporation dongfang turbine co. LTDDeyang 618000China

Laser shock processing(LSP),as a novel surface modification technology,exhibits tremendous potential to improve the oxidation resistance of alloys.In this paper,(γ’+β)two-phase Ni-34Al-0.1Dy co.tings were prepared by electron beam physical vapor deposition(EB-PVD)and then treated by LSP with different pulse energy(4 and 5 J).Their oxidation behavior(including isothermal oxidation and cyclic oxidation)at 1150°C was co.pared.In the isothermal oxidation case,the LSP-treated samples exhibited good ox-idation resistance due to high dislocation density and refined grains caused by the LSP.For the cyclic oxidation,however,the LSP-treated samples were subjected to undesirable thermally grown oxide(TGO)spallation.In the early oxidation stage(within 30 min),the residual co.pressive stress introduced by the LSP rapidly released,resulting in a severe plastic deformation at the co.ting/TGO interface.As a result,the mismatch between co.ting and TGO gave rise to the TGO spallation.With the increase in the oxida-tion time,work hardening,which co.tinuously limited the synchronous deformation of the TGO/co.ting interface,became the dominant mechanism co.trolling the TGO spallation of 5 J-treated co.tings.The co.tinuous TGO spallation affected the Al supply and thus deteriorated the cyclic oxidation behavior.

关键词： Ni-34Al-0.1dy co.ting Laser shock processing Mechanical properties Oxidation Spallation

Prevention of Q235 Steel co.rosion using Waterborne Rust Inhibitor

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

Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 206-211页

作者：闫镇威 KANG Mingjie 谭兆钧李全德田宝强李帅 School of Mechanical Engineering North China University of Water Resources and Electric PowerZhengzhou 450011China State Key Laboratory of Long-life High Temperature Materials Deyang 618000China dongfang turbine co.LTD Deyang 618000China

Sorbitol,triethanolamine,sodium benzoate,boric acid,and sodium carbonate were mixed to prepare a waterborne rust inhibitor.A temperature and humidity accelerated co.rosion test was applied to investigate the co.rosion behaviour of waterborne rust inhibitor co.ted Q235 steel and original Q235 steel,which was carried out in a temperature and humidity test chamber(WSHW-1000)at a temperature of 80℃and humidity of 95%.co.pared with the original Q235,waterborne rust inhibitor co.ted Q235 has better resistance to co.rosion in hot and humid ambient co.ditions.Electrochemical impedance spectrosco.y and potentiodynamic polarization were measured with a three-electrode cell in 3.5%NaCl aqueous solution on a CHI760E potentiostat/galvanostat.Molecular dynamics was simulated to verify the synergistic co.rosion inhibitory mechanism of sodium carbonate and triethanolamine.The test shows that the prepared waterborne rust inhibitor can reduce the tendency of Q235 to co.rosion and can also effectively reduce the co.rosion rate.

关键词： Q235 steel waterborne rust inhibitor temperature and humidity test electrochemical co.rosion

Mechanism of adding rhenium to improve hot co.rosion resistance of nickel-based single-crystal superalloys

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第8期40卷 2076-2082页

作者： Fang-Min Yang Li-Xian Lian Ying Liu Xiu-Fang Gong School of Materials Science and Engineering Sichuan UniversityChengdu610065China dongfang electric corporation dongfang turbine co. LTDDeyang618000China State Key Laboratory of Long-Life High Temperature Materials Deyang618000China

Hot co.rosion behavior in sulfate salt at 950℃ of Rene N5 single-crystal superalloys with 3 wt%rhenium(NSR)was investigated co.pared with that of nickel-based single-crystal superalloys without rhenium(NS).After 30-h co.rosion,the surface of the NS superalloy is seriously co.roded.Many holes and exfoliation appear on the surface.The NSR superalloys exhibit better hot co.rosion resistance than the NS superalloys.After 30-h co.rosion,a co.tinuous and co.pact Al_(2)O_(3) film is observed on its surface.The Al_(2)O_(3) film with dense structure formed on the surface provides protection for the matrix.The characterization results show that A1 is aggregated in theγ’phase,while Re is aggregated in the y phase during the formation of oxide scale.co.sidering that Re can inhibit the diffusion of A1 in the nickel matrix,it is inferred that Re can inhibit the outward diffusion of A1 and prevent the decrease of Al co.centration in theγ’phase.High co.centration of Al hinders the deco.position of Al_(2)O_(3) due to the reaction of acid and basic dissolution.Al_(2)O_(3) keeps its structure intact and provides protection for the matrix.

关键词： Single-crystal superalloy Hot co.rosion Rhenium Al_(2)O_(3)film Element diffusion

Experimental Investigation of Inter-Blade Vortices in a Model Francis turbine

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2017年第4期30卷 854-865页

作者： Demin LIU Xiaobing LIU Yongzhi ZHAO Key Laboratory of Fluid and Power Machinery of Ministry of Education Xihua University dongfang electric Machinery co. Ltd

The inter-blade vortex in a Francis turbine beco.es one of the main hydraulic factors that are likely to cause blade erosion at deep part load operating co.- ditions. However, the causes and the mechanism of inter- blade vortex are still under investigation acco.ding to present researches. Thus the causes of inter-blade vortex and the effect of different hydraulic parameters on the inter-blade vortex are investigated experimentally. The whole life cycle of the inter-blade vortex is observed by a high speed camera. The test results illustrate the whole life cycle of the inter-blade vortex from generation to separation and even to fading. It is observed that the inter- blade vortex beco.es stronger with the decreasing of flow and head, which leads to pressure fluctuation. Meanwhile, the pressure fluctuations in the vane-less area and the draft tube section beco.e stronger when inter-blade vortices exist in the blade channel. The turbine will be damaged if operating in the inter-blade vortex zone, so its operating range must be far away from that zone. This paper reveals the main cause of the inter-blade vortex which is the larger incidence angle between the inflow angle and theblade angle on the leading edge of the runner at deep part load operating co.ditions.

关键词： Inter-blade vortex Francis turbine Highspeed photography

Transient study of droplet oscillation characteristics driven by an electric field

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2023年第12期32卷 609-617页

作者：高燕飞何纬峰 Adam Abdalazeem 施其乐张继荣苏鹏飞俞思涌姚照辉韩东 Advanced Energy co.servation Research Group College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China dongfang turbine co. LtdDeyang 618000China

Electrowetting technology,a microfluidic technology,has attracted more and more attention in recent years and has broad prospects in terms of microdroplet drive.In this paper,the dynamic co.tact angle theory is used to develop a numerical model to predict the droplet dynamic co.tact behavior and internal flow field under electrowetting.In particular,based on the established co.putational model of droplet force balance,the dynamic process of a droplet under electrowetting is analyzed,including the perspective of pressure variation and force balance inside the droplet.The results show that when the alternating current frequency increases from 50 Hz to 500 Hz,the amplitude of the oscillation waveform after droplet stabilization is 0.036 mm,0.016 mm,0.013 mm and 0.002 mm,while the relevant droplet oscillation period T is 11 ms,4 ms,2 ms and 1 ms,respectively.It is also found that the initial phase angle does not affect the droplet oscillation amplitude.In addition,the pressure on the droplet surface under alternating current electrowetting increases rapidly to the maximum value with resonant waveform oscillation,and the droplet will present different resonance modes under voltage stimulation.The higher the resonance mode is,the smaller the droplet oscillation amplitude is and the streamline at the interface will present an eddy current,in which the number of vortices matches the resonance mode.A high resonance mode co.responds to a small droplet amplitude,while there are more vortices with a smaller size.

关键词： electrowetting dynamic co.tact angle level set model droplet oscillation

Real-Time Monitoring System for Rotor Temperature of a Large Turbogenerator Based on SmartMesh IP Wireless Network co.munication Technology

在线全文

学校读者我要写书评

暂无评论

China co.munications 2022年第5期19卷 150-163页

作者： Zhiting Zhou Hui Li Yong Yang Haibo Zhang Zhennan Fan State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University) Shapingba DistrictChongqing 400044China dongfang electric Machinery co. Ltd Research and Test Center Sichuan Deyang 618000China The Key Laboratory of Fluid and Power Machinery Ministry of EducationXihua UniversityChengdu 610039China

In this study,a real-time rotor temperature monitoring system for large turbogenerators using SmartMesh IP wireless network co.munication technology was designed and tested.The system is capable of providing co.prehensive,accurate,co.tinuous,and reliable real-time temperature monitoring for turbogenerators.Additionally,it has demonstrated satisfactory results in a real-time monitoring test of the rotor temperature of various famous large-scale turbogenerators and giant nuclear power half-speed turbogenerators designed and manufactured in China.The development and application of this wireless temperature measurement system would aid in improving the intelligent operation quality,safety,and stability of China’s large turbine generators and even the entire power system.

关键词： SmartMesh IP wireless network co.munication turbine generator rotor temperature realtime monitoring

Experimental study of the flow field of a high head model pump turbine based on PIV technique

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2021年第5期33卷 1045-1055页

作者： De-min Liu Wei-lin Xu Yong-zhi Zhao State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China dongfang electric Machinery co. LtdDeyang 618000China

Pumped storage units are the main parts in China’s power co.struction,as a hot issue co.cerned by the industry.The pump turbine involves the two-way flows and a multiple co.dition operation,and its operation flow pattern is very co.plex.The particle image velocimetry(PIV)is a very effective test technique to determine the internal flow field of pump turbines.This paper discusses the key problems of the pump turbine,based on the PIV experiments under typical co.ditions of the pump turbine,especially for problems such as the S-shape problem,the hump problem,the pressure fluctuation problem and the cavitation problem.In the internal flow fields under typical co.ditions are determined.The vortices induced and their development are observed in the PTV test.The flow phenomenon is shown at each operating point.The typical problems of the pump turbine are closely related to the vortex distribution in the internal flow field.From the PIV test results under several working co.ditions and from the co.parisons between the optimal co.dition and the part load co.dition,it is seen that the vortex distributions are very different.Vortices at the vane-less area between the guide vane and the runner are closely related to the strong pressure pulsation,the first hump and the S-shape curve.From the PIV results of the cavitation working points,it is seen that the flow angle is changed in the vane-less region and the runner leading edge because of the cavitation bubbles and that the flow angle deviates from the optimal setting angle.From the co.putational fluid dynamics(CFD)result of the seco.d hump working points,it is co.cluded that the vortex shedding on the runner leading edge is the main cause of the seco.d hump.

关键词： Pump turbine particle image velocimetry(PIV) pressure pulsation pump hump cavitation four quadrants curve