检索结果-南通市图书馆

High Voltage 2024年第2期9卷 391-402页

作者： Junwen He bangfa peng Guanglin Yu Ronggang Wang Nan Jiang Jie Li Yan Wu School of Electrical Engineering Dalian University of TechnologyDalianChina Canmax Technologies Co. Ltd.SuzhouChina

A dual-frequency(DF)dielectric barrier discharge,excited by the superposition of a 50 Hz low frequency(LF)and a 5000 Hz intermediate frequency(IF),is proposed to enhance *** effect of the LF voltage component on the breakdown behaviour of the DF discharge during different periods has been studied both experimentally and *** number of high-current pulses rises as the LF voltage *** statistical analysis shows that the number of the current pulse amplitude above 80 mA in the DF discharge reaches nearly 6 times that in the IF ***,the total discharge energy in the DF discharge is significantly higher than that in the IF *** simulation re-produces the temporal variation of the breakdown behaviours in the DF *** simulated results reveal that the maximal electric field strength of the breakdown process is greater in the DF discharge compared to the IF discharge during a half-period of ***,the comparison between the IF and DF discharges exhibits that the LF voltage regulates the accumulation of residual charged species on the dielectric surface after the breakdown by modulating the residual voltage between the air gap.

关键词： dielectric excitation excited

Efficient activation of the Co/SBA-15catalyst by high-frequency AC-DBD plasma thermal effects for toluene removal

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

Plasma Science and Technology 2024年第8期26卷 84-94页

作者：李越姜楠刘政妍秦亮彭邦发王荣刚孙玉荣李杰 School of Environment Dalian University of TechnologyDalian 116024People’s Republic of China School of Electrical Engineering Dalian University of TechnologyDalian 116024People’s Republic of China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China Canmax Technologies Co. Ltd.Suzhou 215121People’s Republic of China

Dielectric barrier discharge(DBD)plasma excited by a high-frequency alternating-current(AC)power supply is widely employed for the degradation of volatile organic compounds(VOCs).However,the thermal effect generated during the discharge process leads to energy waste and low energy utilization *** this work,an innovative DBD thermally-conducted catalysis(DBD-TCC)system,integrating high-frequency AC-DBD plasma and its generated thermal effects to activate the Co/SBA-15 catalyst,was employed for toluene ***,Co/SBA-15 catalysts are closely positioned to the ground electrode of the plasma zone and can be heated and activated by the thermal effect when the voltage exceeds 10 k ***12.4 k V,the temperature in the catalyst zone reached 261℃ in the DBD-TCC system,resulting in an increase in toluene degradation efficiency of 17%,CO_(2)selectivity of 21.2%,and energy efficiency of 27%,respectively,compared to the DBD system *** contrast,the DBD thermally-unconducted catalysis(DBD-TUC)system fails to enhance toluene degradation due to insufficient heat absorption and catalytic activation,highlighting the crucial role of AC-DBD generated heat in the activation of the ***,the degradation pathway and mechanism of toluene in the DBD-TCC system were *** work is expected to provide an energy-efficient approach for high-frequency AC-DBD plasma removal of VOCs.

关键词： high-frequency alternating-current power thermal effect dielectric barrier discharge toluene degradation Co/SBA-15 catalysts

基于改进Deformable DETR模型的多源局部放电识别方法及其应用

在线全文

学校读者我要写书评

暂无评论

中国电机工程学报 2024年第15期44卷 6248-6260,I0035页

作者：雷志鹏彭川许子涵姜宛廷李传扬吝伶艳彭邦发煤矿电气设备与智能控制山西省重点实验室(太原理工大学电气与动力工程学院) 山西省太原市030024 电力系统及大型发电设备安全控制和仿真国家重点实验室(清华大学电机系) 北京市海淀区100084

基于图像的局部放电识别方法大部分仅对单源局部放电谱图有效,无法识别多源局部放电谱图。为实现对多源局部放电谱图的识别,该文提出一种基于Transformer架构的局部放电Deformable DETR目标检测模型,收集典型单源局部放电和多源局部放... 详细信息

基于图像的局部放电识别方法大部分仅对单源局部放电谱图有效,无法识别多源局部放电谱图。为实现对多源局部放电谱图的识别,该文提出一种基于Transformer架构的局部放电Deformable DETR目标检测模型,收集典型单源局部放电和多源局部放电数据,生成局部放电相位角解析和极坐标相位分布解析谱图数据集。在Deformable DETR模型中引入去噪训练任务和贝叶斯优化算法,优化了局部放电目标检测模型;编写局部放电谱图采集和识别程序,并使用优化后的局部放电Deformable DETR模型对单源和多源局部放电谱图进行识别。结果表明:局部放电Deformable DETR模型不仅可有效识别出单源和多源局部放电的类型,而且大幅提升了局部放电类型识别的收敛速度和精度等性能。在对真实绝缘缺陷电动机的局部放电谱图识别中,局部放电Deformable DETR模型的识别准确率达到91%,证明该模型在实际应用中的有效性。

关键词：局部放电模式识别 DeformableDETR 目标检测多源局部放电

维普期刊数据库博看期刊

Streamer dynamics and charge self-erasing of two counter-propagating plasmas in repetitively pulsed surface dielectric barrier discharge

在线全文

学校读者我要写书评

暂无评论

High Voltage 2022年第4期7卷 730-743页

作者： bangfa peng Nan Jiang Kefeng Shang Na Lu Jie Li Yan Wu School of Electrical Engineering Dalian University of TechnologyDalianChina

The streamer dynamics and charge self-erasing of two counter-propagating plasmas generated by repetitively pulsed surface dielectric barrier discharge are investigated using electrical and optical diagnosis,and a two-dimensional fluid *** distinct discharge phases of primary,transitional and secondary streamers are identified in a single-pulse discharge through the time-resolved plasma ***,a merging phenomenon of the two opposing primary streamers is observed at the middle position of the discharge *** to the first pulse,a low streamer propagation velocity of the primary streamer is measured during the subsequent discharge process due to the limitation of residual surface charges left by the previous *** significant dif-ferences of the transferred charge and the deposited energy are obtained in the sequential pulses at a discharge gap of 9 *** simulations show that a reduction for the plasma intensity of the approached two primary streamers is attributed by the accumu-lated charge on the dielectric surface and gathered positive charges in the streamer *** and experimental studies indicate that the residual charges can be erased by the secondary streamer through the drifted electrons,namely that a phenomenon of charge self-erasing can be realized in the individual pulse.

关键词： charge dielectric charges

Experimental and simulated investigation of microdischarge characteristics in a pin-to-pin dielectric barrier discharge(DBD)reactor

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

Plasma Science and Technology 2022年第10期24卷 54-66页

作者： Junwen HE bangfa peng Nan JIANG Kefeng SHANG Na LU Jie LI Yan WU School of Electrical Engineering Dalian University of TechnologyDalian 116024People's Republic of China

Both experimental and simulated studies of microdischarge(MD)are carried out in a dielectric barrier discharge with a pin-to-pin gap of 3.5 mm,ignited by a sinusoidal voltage with a peak voltage of 10 kV and a driving frequency of 5 *** results have shown that the probability of the single current pulse in the positive half-period(HP)reaches 73.6%under these *** results show that great luminous intensity is concentrated on the dielectric surface and the tip of the metal electrode.A 1D plasma fluid model is implemented by coupling the species continuity equations,electron energy density equations,Poisson equation,and Helmholtz equations to analyze the MD dynamics on the *** simulated results are in good qualitative agreement with the experimental *** simulated results show that the MD dynamics can be divided into three phases:the Townsend phase,the streamer propagation phase,and the discharge decay *** the streamer propagation phase,the electric field and electron density increase with the streamer propagation from the anode to the cathode,and their maximal values reach 625.48 Td and 2.31×10^(19)m^(-3),as well as 790.13 Td and 3.58×10^(19)m^(-3)in the positive and negative HP,***,a transient glow-like discharge is detected around the anode during the same period of streamer *** formation of transient glow-like discharge is attributed to electrons drifting back to the anode,which is driven by the residual voltage in the air gap.

关键词： atmospheric pressure air dielectric barrier discharge microdischarge plasma fluid mode

Characteristic studies on positive and negative streamers of double-sided pulsed surface dielectric barrier discharge

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2022年第4期24卷 37-52页

作者： Yan JIANG bangfa peng Zhengyan LIU Nan JIANG Na LU Kefeng SHANG Jie LI School of Electrical Engineering Dalian University of TechnologyDalian 116024People's Republic of China School of Environmental Science&Technology Dalian University of TechnologyDalian 116024People's Republic of China

The mechanisms of streamer generation and propagation in double-sided pulsed surface dielectric barrier discharge(SDBD)on both sides have been analyzed and investigated by experiment and numerical *** fully exposed asymmetric SDBD has two discharge processes located on the high voltage electrode(HVE)side and the ground electrode(GE)*** images of the HVE side and GE side are taken by a digital camera under continuous pulse and ICCD(Intensified Charge Coupled Device)is utilized to diagnose the generation and propagation of streamers in single pulse *** order to understand the physical mechanisms of streamer evolution more deeply,we establish a 2D simulation model and analyze it from the aspects of electron density,ion density,reduced electric field and electron impact ionization source *** results show that the primary and secondary discharges on the HVE side and the GE side of the double-sided SDBD are composed of positive streamer and negative streamer,*** the HVE side,the accumulation of positive charges on the dielectric surface causes the direction of the electric field to reverse,which is the principal factor for the polarity reversal of the *** the GE side,both the negative charges accumulated on the dielectric surface and the falling voltage are the key factors for the streamer polarity switch.

关键词： double-sided SDBD positive streamer negative streamer nanosecond pulse

Research on corona discharge suppression of high-voltage direct-current transmission lines based on dielectric-film-covered conductor

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2021年第2期23卷 64-75页

作者： Yuze JIANG Qiying LI Xuekai ZHANG Diwen JIANG Shiqiang LIU bangfa peng Jie LI State Grid Shandong Electric Power Research Institute Jinan 250003People's Republic of China State Grid Shandong Electric Power Company Jinan 250001People's Republic of China State Grid Jinan Jiyang Power Supply Company Jiyang 251400People's Republic of China School of Electrical Engineering Dalian University of TechnologyDalian 116024People's Republic of China

Corona discharge suppression for high-voltage direct-current(HVDC)transmission lines at line terminals such as converter stations is a subject that requires *** this paper,a method based on a conductor covered with dielectric film is proposed and implemented through a bench-scale *** with the bare conductor,the corona discharge suppression effect of the dielectric-film-covered conductor under positive polarity is studied from the composite field strength and ion current density using a line-plate experimental *** influences of film thickness and film material on the corona discharge suppression effect are *** charge accumulation and dissipation characteristics of different film materials are also *** results show that the conductor covered with dielectric film has excellent ability to inhibit corona *** ground-level composite field strength of the conductor covered with dielectric film is lower than its nominal field strength,and its ion current density is at the nA m^(−2) *** corona threshold voltage can be promoted by increasing the film thickness,but the ability to inhibit corona discharge becomes *** larger the surface electric field strength,the more charge accumulated,but the faster the charge dissipation *** with polyvinyl chloride film,cross-linked polyethylene film has stronger charge accumulation ability and slower charge dissipation rate,which can better restrain the corona discharge of HVDC transmission lines.

关键词： high-voltage direct-current(HVDC)transmission lines corona discharge suppression dielectric-film-covered conductor composite field strength ion current density

脉冲参数对脉冲介质阻挡放电臭氧产生影响的数值模拟

在线全文

学校读者我要写书评

暂无评论

高电压技术 2016年第8期42卷 2659-2667页

作者：李鸣彭邦发魏林生章亚芳南昌大学信息工程学院南昌330031 南昌大学机电工程学院南昌330031 中国科学院广州能源研究所广州510640 南昌大学资源环境与化工学院南昌330031 Department of Mechanical and Aerospace Engineering Florida Institute of Technologyfl32901

在脉冲介质阻挡放电产生臭氧的过程中,脉冲参数至关重要。为研究脉冲参数对其流光传播速度和臭氧分子浓度的影响,构建了1个由流体动力学模型和包含11种粒子、29个反应的反应模型组成的准2维动力学模型并进行了数值模拟。模拟结果表明：... 详细信息

在脉冲介质阻挡放电产生臭氧的过程中,脉冲参数至关重要。为研究脉冲参数对其流光传播速度和臭氧分子浓度的影响,构建了1个由流体动力学模型和包含11种粒子、29个反应的反应模型组成的准2维动力学模型并进行了数值模拟。模拟结果表明：流光传播速度和臭氧分子浓度均随脉冲峰值电压的增大而增大,随脉冲上升时间的减小而增大,在模拟工况所得流光速度范围为4.2×104~3.57×105 m/s;脉冲宽度的变化对流光传播速度与臭氧分子浓度基本无影响,但减小脉冲宽度有利于提高臭氧产率;随着脉冲上升率的增大,在流光出现后并经历相同时间时对应的电场强度更大,流光的传播速度随之加快,同时臭氧分子浓度也由于氧原子产生速率的增大而增大。该研究可以为脉冲电源的选择和优化提供参考。

关键词：脉冲参数流光传播臭氧产生脉冲介质阻挡放电平板型动力学数值模拟

等离子体羟基化改性纳米SiO_(2)粒子对绝缘纸绝缘特性的影响

在线全文

学校读者我要写书评

暂无评论

电工技术学报 2023年第24期38卷 6817-6827页

作者：姜楠李志阳彭邦发李杰吴彦大连理工大学电气工程学院大连116024

在绝缘纸中掺杂纳米粒子,可通过其对载流子的限制来提高绝缘纸的绝缘特性。然而,纳米粒子的高比表面积和表面活性易形成“团聚”,导致纳米粒子聚集处易产生局部放电和击穿。为了有效抑制纳米粒子团聚、进一步提高绝缘纸的绝缘特性,利用... 详细信息

在绝缘纸中掺杂纳米粒子,可通过其对载流子的限制来提高绝缘纸的绝缘特性。然而,纳米粒子的高比表面积和表面活性易形成“团聚”,导致纳米粒子聚集处易产生局部放电和击穿。为了有效抑制纳米粒子团聚、进一步提高绝缘纸的绝缘特性,利用介质阻挡放电(DBD)等离子体对纳米SiO_(2)粒子进行羟基化改性,增加纳米粒子表面羟基数,并通过氢键与硅烷偶联剂分子发生偶联作用从而桥接在绝缘纸基体上,改善了纳米粒子和绝缘纸的兼容性,从而改善其团聚,并采用原位聚合法制备了掺杂纳米SiO_(2)粒子的纤维素绝缘纸。利用X射线光电子能谱仪(XPS)、扫描电子显微镜(SEM)、傅里叶红外光谱仪(FTIR)、比表面及孔隙度分析仪(BET)结合滴定法等手段表征了等离子体改性前后纳米SiO_(2)粒子表面化学组分、微观形貌、官能团及接枝羟基数目的变化规律。并考察了等离子体处理条件及改性步骤对绝缘纸击穿场强和体积电阻率的影响。研究结果表明,纳米SiO_(2)粒子经等离子体羟基化改性后表面氧元素含量及羟基吸收峰显著增强,其在绝缘纸中的分散性得到明显改善。当等离子体改性时间为5 min、空气相对湿度为75%时,纳米SiO_(2)粒子表面接枝的羟基数目达到最高。掺杂了3wt%等离子体羟基化改性的纳米SiO_(2)后,绝缘纸的直流击穿场强和体积电阻率达到18.35 kV/mm和17.45×10^(9)Ω·m,较掺杂了未改性纳米SiO_(2)的绝缘纸分别提高了10.7%和19.4%,较未掺杂纳米SiO_(2)粒子的绝缘纸提高了52.3%和106.2%。

关键词：等离子体羟基化纳米粒子改性分散性绝缘纸击穿场强

在线全文

学校读者我要写书评

暂无评论

毛细管共面介质阻挡放电等离子体特性

高电压技术 2023年第10期49卷 4445-4457页

作者：王睿智彭邦发姜楠李杰吴彦大连理工大学电气工程学院大连116024

共面介质阻挡放电(coplanar dielectric barrier discharge,CDBD)因高压电极和接地电极掩埋在绝缘介质中而具有较长的使用寿命和广泛的应用前景。然而,传统CDBD起始电压高、制作较为复杂,这会限制其应用的进一步发展。因此提出了一种新... 详细信息

共面介质阻挡放电(coplanar dielectric barrier discharge,CDBD)因高压电极和接地电极掩埋在绝缘介质中而具有较长的使用寿命和广泛的应用前景。然而,传统CDBD起始电压高、制作较为复杂,这会限制其应用的进一步发展。因此提出了一种新型的毛细管CDBD结构,即用填充铜粉的毛细管作为高/低压电极,并利用两电极间的紧密接触缩短放电气隙以降低起始放电电压。该研究从流光发展过程、光学特性、电学特性以及活性粒子生成角度对毛细管CDBD进行了系统性的研究,并探究了脉冲电压幅值、上升时间、下降时间、峰值平顶宽度、电极直径以及介质的相对介电常数对等离子体特性的影响。结果表明,毛细管CDBD在单次脉冲作用下存在一次放电和二次放电,分别对应电流极性为正和为负的部分。在脉冲上升沿阶段,流光从相邻高/低压毛细管间的“V型”区域底部产生,然后主要沿着高压电极表面爬升并达到最高点。而在脉冲下降沿阶段,流光则主要沿着接地电极表面发展。高的脉冲电压、短的脉冲上升时间和下降时间有利于放电的增强和活性粒子的生成。同时脉冲上升时间的增加还会使得放电均匀性变差,而脉冲峰值平顶宽度的影响则较为有限。相对介电常数的增加能够增强放电强度和降低起始放电电压,而电极直径的增加虽能增加放电面积,但也会使得放电强度变差。

关键词：毛细管共面介质阻挡放电流光演化脉冲参数电极参数等离子体特性