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项目编号 | 1744099 |
Simulations and Theory of Lightning Initiation in Low Thundercloud Fields | |
Victor Pasko | |
主持机构 | Pennsylvania State Univ University Park |
项目开始年 | 2018 |
2018-05-15 | |
项目结束日期 | 2021-04-30 |
资助机构 | US-NSF |
项目类别 | Continuing grant |
项目经费 | 181295(USD) |
国家 | 美国 |
语种 | 英语 |
英文摘要 | This study seeks to theoretically investigate the lightning initiation in low thundercloud fields, that currently represents a fundamental unsolved problem in lightning discharge physics. The research promises to answer questions about the frequency of relevant hydrometeor (rain/snow/ice in cloud) collisions, the kind of discharge process or streamer activity that would be triggered, and the likelihood of conditions required for such discharge activity to escape and continue to develop on larger scales. A better understanding of electric fields around small particles could be of interest to industries like powder-coating and laser printing. The work includes training of young scientists and enables support of undergraduate research. The investigators will, first, quantify the electric field between two spherical hydrometeors using the image charge method and between two non-spherical hydrometeors using the Poisson's equation, and apply the avalanche to streamer transition criteria to observe whether streamer initiation is possible. Second, the investigators will develop a fluid model consisting of continuity equations for positive and negative ions, and electrons coupled with Poisson's equation. Third, the investigators will apply streamer models to describe the streamer development between the two hydrometeors and the streamer escape to open space. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria. |
文献类型 | 项目 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/72619 |
专题 | 环境与发展全球科技态势 |
推荐引用方式 GB/T 7714 | Victor Pasko.Simulations and Theory of Lightning Initiation in Low Thundercloud Fields.2018. |
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