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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
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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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Recovery Algorithm for Space Charge Waveform in Coaxial Cable under Temperature Gradient EI SCIE Scopus
期刊论文 | 2017 , 29 (8) , 1147-1157 | SENSORS AND MATERIALS | IF: 0.482
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

The accumulation of space charge in a coaxial cable under high -voltage direct current (HVDC) may lead to the serious distortion of the internal electrical field, and thus extremely affect the long-term reliability of the cable in service. Therefore, it is significant to measure the space charge characteristic in a full-size power cable in real time. However, because of the existence of a temperature gradient across the cable insulation under DC electrical stress, the density of the dielectric will be inhomogeneous. Moreover, the effect of the coaxial structure on the distortion of measuring waveforms has to be taken into consideration. In this paper, an improved pulsed electroacoustic (PEA) system suited for a full-size power cable under a temperature gradient was realized by designing the units of pulse injection and signal detection. Then, the charge density was corrected according to the nonuniform electric stress distribution and the divergent acoustic propagation. Finally, the system transfer function was amended by adding the dispersion coefficient's quadratic approximation to the general solution of the general wave propagation equation. With this new recovery algorithm, the distortion of the waveform caused by the cable's coaxial structure, acoustic waves' attenuation and dispersion, and temperature gradient effect can be recovered successfully.

Keyword :

space charge coaxial cable recovery algorithm temperature gradient

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GB/T 7714 Wang Xia , Chen Chi , Hao Jia-Qi et al. Recovery Algorithm for Space Charge Waveform in Coaxial Cable under Temperature Gradient [J]. | SENSORS AND MATERIALS , 2017 , 29 (8) : 1147-1157 .
MLA Wang Xia et al. "Recovery Algorithm for Space Charge Waveform in Coaxial Cable under Temperature Gradient" . | SENSORS AND MATERIALS 29 . 8 (2017) : 1147-1157 .
APA Wang Xia , Chen Chi , Hao Jia-Qi , Wu Kai , Chen Xin , Li Wen-Peng et al. Recovery Algorithm for Space Charge Waveform in Coaxial Cable under Temperature Gradient . | SENSORS AND MATERIALS , 2017 , 29 (8) , 1147-1157 .
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Factors Affecting Pulse Injection from Measuring Electrode Based on the Pulsed Electroacoustic Technology for Coaxial Cables EI SCIE Scopus
期刊论文 | 2017 , 29 (8) , 1135-1146 | SENSORS AND MATERIALS | IF: 0.482
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

In the pulsed electroacoustic (PEA) space charge measurement system used for coaxial cables, the waveform of a coupled pulse will directly affect space charge profiles in cable insulation. In this paper, on the basis of the PEA measurement system with pulse injection from a measuring electrode, the original charge acoustic signals in a 35 kV cross-linked polyethylene (XLPE) cable were collected directly from the oscilloscope under different ground distances between the measuring point and the ground point along a cable's semiconductive (SC) layer. At the same time, the effects of ground distance, cable specification, and cable length on the waveform of a coupled pulse were studied through a series of experiments and simulations. The results show that the amplitude of the coupled pulse is directly proportional to the ground distance but inversely proportional to the cable cross section or voltage class. Furthermore, the pulse coupling efficiency is almost the same only if the cables have the same diameter of the outer SC layer. Therefore, a constant pulse coupling efficiency can be obtained by adjusting the ground distance according to the diameter of the cable's outer SC layer.

Keyword :

pulsed electroacoustic method coaxial cable outer semiconductive layer coupled pulse pulse injection

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GB/T 7714 Wang Xia , Hao Jia-Qi , Xiong Jin-Zhou et al. Factors Affecting Pulse Injection from Measuring Electrode Based on the Pulsed Electroacoustic Technology for Coaxial Cables [J]. | SENSORS AND MATERIALS , 2017 , 29 (8) : 1135-1146 .
MLA Wang Xia et al. "Factors Affecting Pulse Injection from Measuring Electrode Based on the Pulsed Electroacoustic Technology for Coaxial Cables" . | SENSORS AND MATERIALS 29 . 8 (2017) : 1135-1146 .
APA Wang Xia , Hao Jia-Qi , Xiong Jin-Zhou , Wu Kai , Fu Ming-Li , Hou Shuai . Factors Affecting Pulse Injection from Measuring Electrode Based on the Pulsed Electroacoustic Technology for Coaxial Cables . | SENSORS AND MATERIALS , 2017 , 29 (8) , 1135-1146 .
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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: 2
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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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Interface Charges between Insulating Materials EI SCIE Scopus
期刊论文 | 2017 , 24 (4) , 2633-2642 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | IF: 1.774
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Abstract :

Multi-layer insulations are commonly used in HVDC applications, giving rise to physical and chemical interfaces in the insulation systems. Space charges at the interface between insulators play crucial roles on the electric field distribution of such insulation systems. The issue arises in the design of high voltage direct current (HVDC) insulations. How to understand the behaviors, mechanisms and effects of interface charges on the electric field distribution? In the past two decades, this specific topic has attracted much interest. Much experimental evidence has shown that interface charges may not follow the classic Maxwell-Wagner-Sillar (MWS) theory. In this paper, the measurement techniques and the phenomena of space charge behaviors at the interfaces between different insulating materials are summarized. It is indicated that surface states should be included in the numerical simulation of the charge and field distributions.

Keyword :

interface traps multi-layer dielectrics interfaces Space charges MWS polarization interface potential barrier

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GB/T 7714 Wu, Kai , Cheng, Chuanhui . Interface Charges between Insulating Materials [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (4) : 2633-2642 .
MLA Wu, Kai et al. "Interface Charges between Insulating Materials" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 24 . 4 (2017) : 2633-2642 .
APA Wu, Kai , Cheng, Chuanhui . Interface Charges between Insulating Materials . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (4) , 2633-2642 .
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Effect of Temperature Gradient on Space Charge Behavior in Epoxy Resin and Its Nanocomposites EI SCIE Scopus
期刊论文 | 2017 , 24 (3) , 1537-1546 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | IF: 1.774
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

The effect of temperature gradient on space charge behavior is necessary to investigate for HVDC insulation. In this paper, space charge distributions in neat epoxy resin (EP) and EP/SiO2 nanocomposites (NC) were measured under different DC stresses and temperature gradients. We found that different temperature conditions applied to the electrodes had a great impact on space charge distributions: Only homocharge accumulated near anode at isothermal conditions, on the contrast, at temperature gradient of 60 degrees C, negative charge injected from cathode (high temperature side) and accumulated in the bulk, heterocharge appeared near anode (low temperature side). Moreover, SiO2 nano-fillers added to NC could suppress the space charge accumulation significantly, and the pattern of space charge distribution in NC at temperature gradient of 60 degrees C also shows differently from that of EP. Numerical simulation based on the bipolar charge transport model was employed to study the experimental results. It shows that under temperature gradient, charge extraction plays an important role in heterocharge accumulation near the low temperature side. Moreover, it indicates that unlike the apparently measured conductivity, the charge mobility of NC does not increase rapidly with temperature in the range from 20 degrees C to 80 degrees C.

Keyword :

nanocomposites epoxy resin space charge HVDC numerical simulation temperature gradient

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GB/T 7714 Dong, Jinhua , Shao, Zhihui , Wang, Yang et al. Effect of Temperature Gradient on Space Charge Behavior in Epoxy Resin and Its Nanocomposites [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (3) : 1537-1546 .
MLA Dong, Jinhua et al. "Effect of Temperature Gradient on Space Charge Behavior in Epoxy Resin and Its Nanocomposites" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 24 . 3 (2017) : 1537-1546 .
APA Dong, Jinhua , Shao, Zhihui , Wang, Yang , Lv, Zepeng , Wang, Xia , Wu, Kai et al. Effect of Temperature Gradient on Space Charge Behavior in Epoxy Resin and Its Nanocomposites . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (3) , 1537-1546 .
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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: 3 SCOPUS Cited Count: 7
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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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Regulation-controlling of boundary layer by multi-wire-to-cylinder negative corona discharge EI SCIE Scopus
期刊论文 | 2017 , 119 , 438-448 | APPLIED THERMAL ENGINEERING | IF: 3.771
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

Multi-wire-to-cylinder corona discharge was studied for better understanding of the electrohydrodynamic phenomena which directly relate to the performance of heat transfer enhancement. A unipolar approximation model was established and numerical simulations were conducted to determinate the heat transfer and velocity distribution of ionic wind. The numerical and experiments results show good agreement. It indicates that higher applied voltage and more corona wires can help decreasing thermal boundary layer thickness and increasing velocity gradient of boundary layer, resulting in the enhancement of heat transfer. When the applied voltage increases from -7 kV to -11 kV and the number of wire increases from corona wire number 1-3, there will be a 39.8% decrease of the thickness of thermal boundary layer. In the condition of U = -11 kV, the maximum local forced convection heat transfer coefficient for corona wire number N = 3 is 12 times and the average value is 8 times higher than that of natural convection. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Boundary layer Heat transfer enhancement Field synergy Electrohydrodynamic

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GB/T 7714 Wang, Wei , Yang, Lanjun , Wu, Kai et al. Regulation-controlling of boundary layer by multi-wire-to-cylinder negative corona discharge [J]. | APPLIED THERMAL ENGINEERING , 2017 , 119 : 438-448 .
MLA Wang, Wei et al. "Regulation-controlling of boundary layer by multi-wire-to-cylinder negative corona discharge" . | APPLIED THERMAL ENGINEERING 119 (2017) : 438-448 .
APA Wang, Wei , Yang, Lanjun , Wu, Kai , Lin, Cen , Huo, Peng , Liu, Shuai et al. Regulation-controlling of boundary layer by multi-wire-to-cylinder negative corona discharge . | APPLIED THERMAL ENGINEERING , 2017 , 119 , 438-448 .
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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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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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Space Charge Behavior under Temperature Gradient and Its Effects on Material Aging EI CPCI-S Scopus
会议论文 | 2017 , 1-9 | 1st International Conference on Electrical Materials and Power Equipment (ICEMPE)
WoS CC Cited Count: 4 SCOPUS Cited Count: 1
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Abstract :

When a power apparatus is put into operation, temperature difference always exists in its insulation. As to HVDC insulation system, this temperature gradient may play an important role on the space charge behavior and field distribution. This report summarized our attempts to understand the effects of temperature gradient on space charge and material lifetime. Modified pulsed electro-acoustic (PEA) measurement systems and corresponding waveform recovery algorithms applicable to temperature gradient for film samples and coaxial cables were developed. Space charge behaviors under different temperature gradients of film samples, like LDPE, oil-paper and epoxy resin, as well as of coaxial cable were compared. Moreover, a bipolar charge transport model was used to elucidate these phenomena and study the mechanism of space charge behavior under temperature gradient. It was concluded that conductivity gradient caused by temperature gradient across the bulk and the different injection and extraction behavior of charges due to temperature difference of two electrodes brought up the different experimental results. Furthermore, step voltage test was carried out to study the aging law of XLPE. The obvious increase of aging exponent under temperature gradient was attributed to the hetero-charge accumulation, which increased rapidly with electrical field and thus greatly enhanced the field distortion and recombination density in the adjacent of low-temperature electrode.

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GB/T 7714 Wu, Kai , Su, Rui , Wang, Xia . Space Charge Behavior under Temperature Gradient and Its Effects on Material Aging [C] . 2017 : 1-9 .
MLA Wu, Kai et al. "Space Charge Behavior under Temperature Gradient and Its Effects on Material Aging" . (2017) : 1-9 .
APA Wu, Kai , Su, Rui , Wang, Xia . Space Charge Behavior under Temperature Gradient and Its Effects on Material Aging . (2017) : 1-9 .
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