Schlieren techniques for observations of long positive sparks:Review and application  

作　　者：Junjia He Xiankang Wang Xiangen Zhao Juhyeong Lee Yaping Du Xiaopeng Liu Quan Gan Yang Liu Yuqin Liao 

机构地区：[1]State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan,China [2]Department of Building Environment and Energy Engineering,Hong Kong Polytechnic University,Kowloon,China [3]Department of Mechanical and Aerospace Engineering,Utah State University,Logan,Utah,USA

出　　处：《High Voltage》2022年第5期825-839,共15页高电压（英文）

基　　金：China Postdoctoral Science Foundation,Grant/Award Number:2018M633193;National Natural Science Foundation of China,Grant/Award Number:51821005。

摘　　要：Understanding the mechanism of positive leader discharge is important in lightning protection engineering and the external insulation design in high voltage power transmission systems.During the propagation of a positive leader,some processes without light-emitting,for example,the insulation recovery process after the breakdown,cannot be observed by optical photography techniques.With the combination of the digital high-speed imaging system,the conventional Schlieren techniques offer new vistas in the long air gap discharge observation.The important features of high spatial resolution,high sensitivity,and easy arrangement make Schlieren techniques powerful and effective tools for characterising the discharge processes without light-emitting.This work presents a brief review of current Schlieren techniques and discusses the design of the Schlieren optics system for long spark observations.Several interesting phenomena discovered at different phases of long sparks with high-speed Schlieren techniques are also presented.

关 键 词：INSULATION system POSITIVE 

分 类 号：TM726.1[电气工程—电力系统及自动化]