DOI: 10.1016/j.atmosres.2017.09.012
Scopus记录号: 2-s2.0-85033456039
论文题名: A macroscopic physical model for self-initiated upward leaders from tall grounded objects and its application
作者: Chan M.-K. ; Chen M. ; Du Y.-P.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 200 起始页码: 13
结束页码: 24
语种: 英语
英文关键词: Leader initiation
; Leader modeling
; Leader propagation
; Tall grounded object
; Upward positive leader
Scopus关键词: Electric corona
; Electric fields
; Electric lines
; Lightning
; Channel structures
; Energy conservation law
; Grounded objects
; Leader initiation
; Physical parameters
; Propagation speed
; Space charge layers
; Upward positive leaders
; Electric grounding
; atmospheric electricity
; atmospheric modeling
; experimental study
; lightning
; thundercloud
; thunderstorm
英文摘要: This paper presents a macroscopic physical model that can simulate an upward leader initiated from a tall grounded object under thunderclouds. Based on a tri-layer leader channel structure and the energy conservation law, a new equation for estimating the upward leader propagation speed is proposed. Equations for modeling other physical parameters, such as the leader line charge density, leader core radius, leader corona sheath radius, leader current, leader electric field and leader conductance, are also proposed. Besides, a set of initiation and survival criteria for a steady self-initiated upward leader from a tall grounded object is suggested. Based on the suggested criteria and the proposed model, the critical corona and charge amount as well as the minimum height for successful initiation of an upward positive leader (UPL) from a tall grounded object are evaluated and discussed. The model is then used to investigate the general properties of UPLs self-initiated from tall grounded objects with and without the effect of corona space charge layer near the ground under different thunderstorm conditions. The modelling results can well explain the leader properties observed in literature. The model is further tested with two set of experiment data and very promising results are obtained. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109017
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
Recommended Citation:
Chan M.-K.,Chen M.,Du Y.-P.. A macroscopic physical model for self-initiated upward leaders from tall grounded objects and its application[J]. Atmospheric Research,2018-01-01,200