| Related citation: | Qiuping Zheng,Ting Chen,Yingli Wang,Dongyue Cao,Haitao Hu,Dianchun Zheng.Discharge Behaviors of Supercritical N2 under Direct-Current Electric Field[J].Journal of Harbin Institute Of Technology(New Series),2025,32(4):55-63.DOI:10.11916/j.issn.1005-9113.24038. |
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| Author Name | Affiliation | | Qiuping Zheng | Instrumentation Technology & Economy Institute, Beijing 100055, China | | Ting Chen | School of Electrical and Electronic Engineering，Harbin University of Science and Technology, Harbin 150080, China | | Yingli Wang | School of Measurement and Communication，Harbin University of Science and Technology, Harbin 150080, China | | Dongyue Cao | School of Measurement and Communication，Harbin University of Science and Technology, Harbin 150080, China | | Haitao Hu | Network Information Center, Harbin University of Science and Technology, Harbin 150080, China | | Dianchun Zheng | School of Electrical and Electronic Engineering，Harbin University of Science and Technology, Harbin 150080, China |
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| Abstract: |
| The precise mathematical method was adopted to simulate the breakdown process of 5 mm rod and plate electrode gap, which was filled with supercritical nitrogen at the condition of 127 K, 4 MPa and seed electron density 1×106 m-3 under 29 kV DC voltage. The result shows that the discharge process was completed within 11.8 ns from seed electron triggering, avalanche bulking to streamer extending until gap eventually breakdown. The entire gap breakdown process was divided into three discharge stages, namely, the initial discharge triggered (0-4 ns), avalanche (4-7 ns) and streamer phase ( 7-11.8 ns). At the same time, the facts were also revealed that the discharge evolution, electric field distribution, and electron density had different values, and also showed different temporal and spatial distribution characteristics along the axis of the discharge gap. Specifically, the discharge characteristics of SCN2 under 1, 2, 3, 4, 4.5, and 5 MPa at 127 K were theoretically analyzed respectively, and the microscopic mechanisms of the breakdown process were also detailed. The results indicate that the gas discharge law remained applicable within the 1-3 MPa range. However, the discharge characteristics of supercritical nitrogen at 3.4-5 MPa differed significantly from those at lower pressures, likely attributable to the unique state of matter exhibited by supercritical nitrogen. This study contributes to understanding the discharge mechanism of supercritical nitrogen and offers theoretical guidance for its practical application in the power industry. |
| Key words: SCN2 discharge behavior avalanche streamer clusters |
| DOI：10.11916/j.issn.1005-9113.24038 |
| Clc Number:TM855 |
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| Descriptions in Chinese: |
| 直流电场作用下超临界N2的放电行为 郑秋平1，陈亭2，王英立3，曹东跃3，胡海涛，郑殿春2 （1机械工业仪器仪表综合技术经济研究所，北京100055； 2哈尔滨理工大学 电气与电子工程学院，哈尔滨150080； 哈尔滨理工大学 测控技术与通信工程学院，哈尔滨 150008； 哈尔滨理工大学 网络信息中心，哈尔滨 150008） 摘要：采用精确的数学方法，模拟了29 kV直流电压下127 K、4 MPa、种子电子密度 1×106m-3条件下超临界氮N2填充棒板电极系统5 mm间隙击穿过程。结果表明，从初始种子电子触发、电子崩激增到流注急速扩张直至间隙最终击穿，放电过程在11.8 ns内完成。且整个间隙击穿过程分为3个放电阶段，分别为0-4 ns初始放电阶段、4 ns~7 ns雪崩阶段和7 ns~11.8 ns流注阶段。同时也揭示了放电演化、电场分布和电子密度具有不同的数值，并沿放电间隙轴线呈现出不同的时空分布特征。此外，对127 K温度下1 MPa、2 MPa、3 MPa以及3.4 MPa、4.5 MPa、5 MPa的放电特性进行了理论分析和对比。结果表明：当压强为1 MPA ~ 3 MPa时，间隙放电仍符合气体放电规律，而在3.4-5 MPa压强范围，超临界氮N2间隙放电过程具有明显特性，可能是超临界N2微观结构所致。本文的成果有助于深入探索超临界氮N2的放电机理，并为其在电力领域的实际应用提供技术支持。 关键词：超临界氮，放电特性，雪崩，流注，团簇 |
