Re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps
Characteristics of the streamer stem are essential for the study on the stable leader inception. Experiments are conducted to observe the re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps, preceding the inception of a stable leader. Based...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2021-05-01
|
| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0050952 |
| _version_ | 1818598085916360704 |
|---|---|
| author | Xiangen Zhao Xiankang Wang Xiaopeng Liu Yang Liu Quan Gan Ruihan Qi Junjia He |
| author_facet | Xiangen Zhao Xiankang Wang Xiaopeng Liu Yang Liu Quan Gan Ruihan Qi Junjia He |
| author_sort | Xiangen Zhao |
| collection | DOAJ |
| description | Characteristics of the streamer stem are essential for the study on the stable leader inception. Experiments are conducted to observe the re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps, preceding the inception of a stable leader. Based on the simultaneously measured applied voltage, discharge current, direct images, and schlieren images, two typical types of stem re-illuminations are identified and show great differences. For the stem re-illumination under the rising electric field, it is accompanied by an abrupt elongation of stem channel, intense optical radiation, and a current superposed on at least two asynchronous current pulses, while for that subjected to the nearly non-changing electric field, there are no elongation of stem channel, a much weaker light emission, and a single, double exponential current pulse. Moreover, the latter case shows obvious periodicity. A comparative analysis of experimental results shows that factors triggering these two types of stem re-illuminations may be also different in which not only the electric field but also its time derivatives play an important role. These findings can further deepen the understanding of the streamer stem before the leader inception. |
| first_indexed | 2024-12-16T11:58:06Z |
| format | Article |
| id | doaj.art-b0636111381c4e658385c144f702c633 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-16T11:58:06Z |
| publishDate | 2021-05-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-b0636111381c4e658385c144f702c6332022-12-21T22:32:30ZengAIP Publishing LLCAIP Advances2158-32262021-05-01115055303055303-810.1063/5.0050952Re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gapsXiangen Zhao0Xiankang Wang1Xiaopeng Liu2Yang Liu3Quan Gan4Ruihan Qi5Junjia He6State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, 430074 Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, 430074 Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, 430074 Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, 430074 Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, 430074 Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, 430074 Wuhan, ChinaState Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, 430074 Wuhan, ChinaCharacteristics of the streamer stem are essential for the study on the stable leader inception. Experiments are conducted to observe the re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps, preceding the inception of a stable leader. Based on the simultaneously measured applied voltage, discharge current, direct images, and schlieren images, two typical types of stem re-illuminations are identified and show great differences. For the stem re-illumination under the rising electric field, it is accompanied by an abrupt elongation of stem channel, intense optical radiation, and a current superposed on at least two asynchronous current pulses, while for that subjected to the nearly non-changing electric field, there are no elongation of stem channel, a much weaker light emission, and a single, double exponential current pulse. Moreover, the latter case shows obvious periodicity. A comparative analysis of experimental results shows that factors triggering these two types of stem re-illuminations may be also different in which not only the electric field but also its time derivatives play an important role. These findings can further deepen the understanding of the streamer stem before the leader inception.http://dx.doi.org/10.1063/5.0050952 |
| spellingShingle | Xiangen Zhao Xiankang Wang Xiaopeng Liu Yang Liu Quan Gan Ruihan Qi Junjia He Re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps AIP Advances |
| title | Re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps |
| title_full | Re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps |
| title_fullStr | Re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps |
| title_full_unstemmed | Re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps |
| title_short | Re-illumination of streamer stems under either rising or non-changing positive electric fields in long air gaps |
| title_sort | re illumination of streamer stems under either rising or non changing positive electric fields in long air gaps |
| url | http://dx.doi.org/10.1063/5.0050952 |
| work_keys_str_mv | AT xiangenzhao reilluminationofstreamerstemsundereitherrisingornonchangingpositiveelectricfieldsinlongairgaps AT xiankangwang reilluminationofstreamerstemsundereitherrisingornonchangingpositiveelectricfieldsinlongairgaps AT xiaopengliu reilluminationofstreamerstemsundereitherrisingornonchangingpositiveelectricfieldsinlongairgaps AT yangliu reilluminationofstreamerstemsundereitherrisingornonchangingpositiveelectricfieldsinlongairgaps AT quangan reilluminationofstreamerstemsundereitherrisingornonchangingpositiveelectricfieldsinlongairgaps AT ruihanqi reilluminationofstreamerstemsundereitherrisingornonchangingpositiveelectricfieldsinlongairgaps AT junjiahe reilluminationofstreamerstemsundereitherrisingornonchangingpositiveelectricfieldsinlongairgaps |