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< Page ,Total 28 >
Flattening and solidification behavior of in-flight droplets in plasma spraying and micro/macro-bonding mechanisms SCIE
期刊论文 | 2019 , 784 , 834-846 | JOURNAL OF ALLOYS AND COMPOUNDS
WoS CC Cited Count: 1
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Abstract :

The microstructure and bonding strength of plasma sprayed coating are highly dependent on flattening and solidification behavior of in-flight droplets. In the present study, the flattening and solidification behavior of subsonic/supersonic droplets after impacting on a flat substrate was comparatively studied. Results show that a dimensionless Somerfeld number (K) of flattening droplets can be used as the splashing threshold. Due to the extremely rapid spreading and solidification of supersonic-droplet, some large-sized bubbles and grains that usually formed at the bottom of flattened subsonic-droplet were effectively restrained, leading to the improvement of splat/substrate micro-shear strength. The effect of grain size and growth feature on the macro-bonding property was further elaborated. It was found that the simultaneous increase of both velocity and temperature of in-flight droplets was an effective approach for the improvement of bonding strength of as-sprayed coating. (C) 2019 Elsevier B.V. All rights reserved.

Keyword :

Yttria partially stabilized zirconia Thermal barrier coatings Bubbles Micro/macro-bonding Splats

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GB/T 7714 Wang, Y. , Bai, Y. , Wu, K. et al. Flattening and solidification behavior of in-flight droplets in plasma spraying and micro/macro-bonding mechanisms [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2019 , 784 : 834-846 .
MLA Wang, Y. et al. "Flattening and solidification behavior of in-flight droplets in plasma spraying and micro/macro-bonding mechanisms" . | JOURNAL OF ALLOYS AND COMPOUNDS 784 (2019) : 834-846 .
APA Wang, Y. , Bai, Y. , Wu, K. , Zhou, J. , Shen, M. G. , Fan, W. et al. Flattening and solidification behavior of in-flight droplets in plasma spraying and micro/macro-bonding mechanisms . | JOURNAL OF ALLOYS AND COMPOUNDS , 2019 , 784 , 834-846 .
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Partial Discharges and the Problem of Initial Conditions EI CPCI-S Scopus
会议论文 | 2017 | International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM)
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Abstract :

The mathematical model of the PD process in the lonely inclusion can be described as a series of discharges at the period of the operation voltage. Distribution of the separate discharge times depends on breakdown correlation, extinction and initial condition voltages and the operation voltage. These factors are deterministic as physical phenomena and are stochastic as a result of their influence on many indefinite stochastic coefficients. It is necessary to conduct the deep analysis of the initial conditions influencing the PD process. The surface PD can arise in the several nearby points that also can be interacted. They can change the initial conditions of each other and change time parameters of the relaxation PD process. Some issues of the several PD arising are investigated. The problem of the several PD interaction is discussed. The modeling results are given.

Keyword :

insulation partial discharges mathematical modeling

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GB/T 7714 Kinsht, N. V. , Petrunko, N. N. , Wu, Kai . Partial Discharges and the Problem of Initial Conditions [C] . 2017 .
MLA Kinsht, N. V. et al. "Partial Discharges and the Problem of Initial Conditions" . (2017) .
APA Kinsht, N. V. , Petrunko, N. N. , Wu, Kai . Partial Discharges and the Problem of Initial Conditions . (2017) .
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残余应力测试方法在GIS盆式绝缘子中的应用前景 PKU
期刊论文 | 2017 , (3) , 1-5 | 绝缘材料
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Abstract :

主要介绍了钻孔法、压痕法、X射线法、光弹法以及超声波法等残余应力测试方法的原理与发展现状,并探讨这些方法在GIS盆式绝缘子中的应用前景.

Keyword :

测试 残余应力 超声波法 盆式绝缘子 压痕法

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GB/T 7714 苏耕 , 伍维健 , 周峻 et al. 残余应力测试方法在GIS盆式绝缘子中的应用前景 [J]. | 绝缘材料 , 2017 , (3) : 1-5 .
MLA 苏耕 et al. "残余应力测试方法在GIS盆式绝缘子中的应用前景" . | 绝缘材料 3 (2017) : 1-5 .
APA 苏耕 , 伍维健 , 周峻 , 吴锴 , 张乔根 . 残余应力测试方法在GIS盆式绝缘子中的应用前景 . | 绝缘材料 , 2017 , (3) , 1-5 .
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Replacement of Aging Power Transformers Considering System Risks under Multi-level Load EI CPCI-S Scopus
会议论文 | 2017 , 1-5 | 2017 IEEE Power & Energy Society General Meeting
WoS CC Cited Count: 1
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Abstract :

With an increasing number of installed power transformers have entered aging stage, the retirement timing becomes a major issue for power utilities because of their huge reinvestment cost and key roles in the reliable power supply. In this paper, a cost-benefit analysis method is put forward to decide the replacement decision-making problems for aging power transformers by considering system risks under multi stages of the load. First, load factors under each load level are derived from the standard optimal load flow results. Then, annual expected energy not supplied (EENS) is calculated with non-sequential Monte-Carlo method. Last, risks decrease benefit and net reinvestment cost is considered to make a good decision of retirement for aging power transformers. The IEEE 24-bus reliability test system is employed to demonstrate the effectiveness of this method, and several interesting conclusions are obtained from case study results.

Keyword :

Aging Monte-Carlo power transformer cost-benefit analysis risks

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GB/T 7714 Ye, Zhigang , Wu, Kai , Cheng, Chuanhui et al. Replacement of Aging Power Transformers Considering System Risks under Multi-level Load [C] . 2017 : 1-5 .
MLA Ye, Zhigang et al. "Replacement of Aging Power Transformers Considering System Risks under Multi-level Load" . (2017) : 1-5 .
APA Ye, Zhigang , Wu, Kai , Cheng, Chuanhui , Song, Wenjin . Replacement of Aging Power Transformers Considering System Risks under Multi-level Load . (2017) : 1-5 .
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A Numerical Simulation Model for Oil Flow Electrification under DC Voltage EI CPCI-S Scopus
会议论文 | 2017 , 687-690 | International Symposium on Electrical Insulating Materials (ISEIM)
WoS CC Cited Count: 1
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Abstract :

According to our previous experiment, oil flow electrification is closely related to the space charge behaviors in oil-paper insulation system under DC voltage. In this paper, we present a new numerical method to estimate the streaming current in a rectangular paper duct under DC voltage. For the simulation model, we consider the case of laminar flow in a sample of two layers of oil-impregnated-paper and oil between two electrodes. Moreover, on the basis of bipolar transport model, the effects of charge injection and ion mobility are taken into account. Numerical results show that the amplitude of streaming current is always enhanced with the increase of applied voltage. Compared to the result estimated by AC simulation model, the result of our simulation model has larger amplitude, and the consequence of our numerical simulation is in accordance with the experimental results.

Keyword :

ion mobility flow electrification streaming current simulation

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GB/T 7714 Dai, Jie , Wu, Kai , Jiang, Yingye et al. A Numerical Simulation Model for Oil Flow Electrification under DC Voltage [C] . 2017 : 687-690 .
MLA Dai, Jie et al. "A Numerical Simulation Model for Oil Flow Electrification under DC Voltage" . (2017) : 687-690 .
APA Dai, Jie , Wu, Kai , Jiang, Yingye , Cheng, Chuanhui , Zhou, Jun . A Numerical Simulation Model for Oil Flow Electrification under DC Voltage . (2017) : 687-690 .
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Effect of toughened epoxy resin on partial discharge at solid-solid interface EI SCIE Scopus CSCD
期刊论文 | 2017 , 19 (2) , 6 | PLASMA SCIENCE & TECHNOLOGY | IF: 1.07
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

A series of solid-solid interfaces, consisting of ceramic-epoxy resin interface samples with a tip-plate electrode, were investigated by performing partial discharge tests and realtime. electrical tree observations. A toughening agent was added to the epoxy resin at different ratios for comparison. The impact strength, differential scanning calorimetry (DSC) and dielectric properties of the cured compositions and ceramic were tested. The electric field strength at the tip was calculated based on Maxwell's theory. The test results show that the addition of a toughener can improve the impact strength of epoxy resin but it decreases the partial discharge inception voltage (PDIV) of the interface sample. At the same time, toughening leads to complex branches of the electrical tree. The simulation result suggests that this reduction of the PDIV cannot be explained by a change of permittivity due to the addition of a toughening agent. The microstructural change caused by toughening was considered to be the key factor for lower PDIV and complex electrical tree branches.

Keyword :

solid-solid interface partial discharge epoxy resin toughening electrical tree

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GB/T 7714 Li, Manping , Wu, Kai , Zhang, Zhao et al. Effect of toughened epoxy resin on partial discharge at solid-solid interface [J]. | PLASMA SCIENCE & TECHNOLOGY , 2017 , 19 (2) : 6 .
MLA Li, Manping et al. "Effect of toughened epoxy resin on partial discharge at solid-solid interface" . | PLASMA SCIENCE & TECHNOLOGY 19 . 2 (2017) : 6 .
APA Li, Manping , Wu, Kai , Zhang, Zhao , Cheng, Yonghong . Effect of toughened epoxy resin on partial discharge at solid-solid interface . | PLASMA SCIENCE & TECHNOLOGY , 2017 , 19 (2) , 6 .
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Effect of Space Charge in the Aging Law of Cross-Linked Polyethylene Materials for High Voltage DC Cables EI SCIE Scopus
期刊论文 | 2017 , 33 (4) , 53-59 | IEEE ELECTRICAL INSULATION MAGAZINE | IF: 1.764
WoS CC Cited Count: 5
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Keyword :

step-voltage test aging space charge aging law high voltage DC insulation

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GB/T 7714 Wu, Kai , Wang, Ya , Wang, Xia et al. Effect of Space Charge in the Aging Law of Cross-Linked Polyethylene Materials for High Voltage DC Cables [J]. | IEEE ELECTRICAL INSULATION MAGAZINE , 2017 , 33 (4) : 53-59 .
MLA Wu, Kai et al. "Effect of Space Charge in the Aging Law of Cross-Linked Polyethylene Materials for High Voltage DC Cables" . | IEEE ELECTRICAL INSULATION MAGAZINE 33 . 4 (2017) : 53-59 .
APA Wu, Kai , Wang, Ya , Wang, Xia , Fu, Mingli , Hou, Shuai . Effect of Space Charge in the Aging Law of Cross-Linked Polyethylene Materials for High Voltage DC Cables . | IEEE ELECTRICAL INSULATION MAGAZINE , 2017 , 33 (4) , 53-59 .
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Investigation of dielectric and thermal conductive properties of epoxy resins modified by core-shell structured PS@SiO2 EI SCIE Scopus
期刊论文 | 2017 , 97 , 76-82 | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | IF: 4.514
WoS CC Cited Count: 9 SCOPUS Cited Count: 8
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Abstract :

In this study, the core-shell structured polystyrene@SiO2 (PS@SiO2) microspheres were successfully synthesized by tetraethylorthosilicate (TEOS) hydrolysis method. The synthesized PS@SiO2 microspheres were subsequently characterized by FTIR spectroscopy, XRD, SEM, and TEM respectively. The results indicated that the particle size of PS@SiO2 microspheres is about 2 gm, and the PS microsphere is uniformly coated by amorphous SiO2 shell. PS@SiO2/cyanate ester (CE)/epoxy resin (ER) composite films were prepared with PS@SiO2 microspheres as fillers and morphology of the films was inspected by AFM. The images showed that the PS@SiO2 microspheres were well-distributed in epoxy matrix. Thermal conductivity of PS@SiO2/CE/ER composite increases 131% by adding 1.0 wt% of PS@SiO2 microspheres. The volume resistivity of composites decreased with increasing of the loading of PS@SiO2 fillers and still keeping an excellent insulating performance. In addition, the dielectric constant as well as the dielectric loss of composites increased with the increased the content of PS@SiO2 microspheres. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

PS@SiO2 microspheres Dielectric property Thermal conductivity CE/ER matrix

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GB/T 7714 Zhou, Jun , Jiang, Yingye , Wu, Gaoqing et al. Investigation of dielectric and thermal conductive properties of epoxy resins modified by core-shell structured PS@SiO2 [J]. | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING , 2017 , 97 : 76-82 .
MLA Zhou, Jun et al. "Investigation of dielectric and thermal conductive properties of epoxy resins modified by core-shell structured PS@SiO2" . | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING 97 (2017) : 76-82 .
APA Zhou, Jun , Jiang, Yingye , Wu, Gaoqing , Wu, Weijian , Wang, Yang , Wu, Kai et al. Investigation of dielectric and thermal conductive properties of epoxy resins modified by core-shell structured PS@SiO2 . | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING , 2017 , 97 , 76-82 .
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Simulation of cavity PD sequences at DC voltage by considering surface charge decay EI SCIE Scopus
期刊论文 | 2017 , 50 (20) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 2.373
WoS CC Cited Count: 8 SCOPUS Cited Count: 10
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Abstract :

In this paper, the dynamic distribution of surface charges during partial discharge (PD) sequences was obtained at both polarities of direct current (DC) voltage, as well as at different levels of voltage. It is found that the decay rate of positive charges was higher than that of negative ones, and PD would take place with the existence of residual surface charges. Moreover, the curves to describe surface charges decaying discipline were obtained. Based on these, a simulation model about PD sequence at DC voltage was constructed by considering surface charge decay and discharge time lag. With the help of simulation model, microscopic physical processes, i.e. streamer development and surface charge accumulation, were obtained, as well as macroscopic parameters i.e. discharge current and discharge time. The accumulation of surface charges took a much shorter time at negative voltage than at the positive. Besides, discharge time interval at positive voltage was smaller than that at negative one, and it diminished as voltage increased, which were in accordance with the experimental results. In terms of the evolution of electric field within cavity, the effects of surface charge decay and discharge time lag on discharge time interval and PD magnitude were discussed. The exhaustive physical model is significant to clarify PD mechanism at DC voltage.

Keyword :

surface charge decay partial discharge discharge time lag streamer DC voltage

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GB/T 7714 Pan, Cheng , Wu, Kai , Du, Yan et al. Simulation of cavity PD sequences at DC voltage by considering surface charge decay [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2017 , 50 (20) .
MLA Pan, Cheng et al. "Simulation of cavity PD sequences at DC voltage by considering surface charge decay" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 50 . 20 (2017) .
APA Pan, Cheng , Wu, Kai , Du, Yan , Tang, Ju , Tao, Xiantao , Luo, Yi . Simulation of cavity PD sequences at DC voltage by considering surface charge decay . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2017 , 50 (20) .
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Characterization of Sr/Ru co-doped ferrite based perovskite as a symmetrical electrode material for solid oxide fuel cells EI SCIE Scopus
期刊论文 | 2017 , 348 , 94-106 | JOURNAL OF POWER SOURCES | IF: 6.945
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Abstract :

The perovskite Sm0.9Sr0.1Fe0.9Ru0.1O3-delta (SSFR) is synthesized and investigated as a new type of symmetrical electrode material for solid oxide fuel cells (SOFCs). X-ray diffraction analysis indicates that SSFR exhibits an orthorhombic structure with a space group of Pnma (62). There are no significant changes in polarization resistance (R-p) after a series of experiments in hydrogen and oxygen atmospheres at 800 degrees C, implying that SSFR has a good redox stability. To get an insight into the rate-limiting steps of SSFR electrode, behavior of R-p, is investigated in different oxygen partial pressures (pO(2)). Generally, the relationship between Rp and pO(2) follows the equation R-p = k(pO(2))(-n) and different n values correspond to different rate-limiting steps. In this study, the n value of 0:5 is obtained for SSFR cathode at high temperature, relating to the diffusion of oxygen atom. In high pO(2), SSFR presents a p-type conducting behavior, with decreasing pO(2), a p-n transition occurs in the range 10(-17) to 10(-18) atm. Additionally, peak power density of the Sm0.2Ce0.8O1.9 (SDC, similar to 0.6 mm) electrolyte -supported symmetrical cell SSFRISDCISSFR achieves 119.69 mW cm(-2) at 800 degrees C using humidified hydrogen (similar to 3% H2O) as fuel. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

Oxygen reduction reaction Solid oxide fuel cells Electrical conductivity Symmetrical electrode Perovskite oxide

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GB/T 7714 Fan, Weiwei , Sun, Zhu , Zhou, Jun et al. Characterization of Sr/Ru co-doped ferrite based perovskite as a symmetrical electrode material for solid oxide fuel cells [J]. | JOURNAL OF POWER SOURCES , 2017 , 348 : 94-106 .
MLA Fan, Weiwei et al. "Characterization of Sr/Ru co-doped ferrite based perovskite as a symmetrical electrode material for solid oxide fuel cells" . | JOURNAL OF POWER SOURCES 348 (2017) : 94-106 .
APA Fan, Weiwei , Sun, Zhu , Zhou, Jun , Wu, Kai , Cheng, Yonghong . Characterization of Sr/Ru co-doped ferrite based perovskite as a symmetrical electrode material for solid oxide fuel cells . | JOURNAL OF POWER SOURCES , 2017 , 348 , 94-106 .
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