An improved inversion algorithm to reconstruct 2D temperature fields of long sparks with high-speed schlieren technique

•Two-dimensional temperature fields of spark channel are firstly presented.•The deviation of the discharge channel axis can cause huge errors of temperature.•An improved inverse Abel transform algorithm is proposed.•High-speed schlieren technique is used to measure the spark channel temperature. The...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Measurement : journal of the International Measurement Confederation Jg. 180; S. 109620
Hauptverfasser: Liu, Xiaopeng, Wang, Xiankang, Zhao, Xiangen, Xiao, Pei, Liu, Yang, He, Junjia
Format: Journal Article
Sprache:Englisch
Veröffentlicht: London Elsevier Ltd 01.08.2021
Elsevier Science Ltd
Schlagworte:
Algorithms
Channels
Dichotomy
Discharge
Errors
Heat transfer
High order total variation regularization
High speed
Inverse Abel transform
Long spark
Regularization
Schlieren technique
Temperature
Temperature measurement
Two-dimensional temperature reconstruction
Dichotomy
Long spark
Schlieren technique
Inverse Abel transform
Two-dimensional temperature reconstruction
High order total variation regularization
ISSN:0263-2241, 1873-412X
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:•Two-dimensional temperature fields of spark channel are firstly presented.•The deviation of the discharge channel axis can cause huge errors of temperature.•An improved inverse Abel transform algorithm is proposed.•High-speed schlieren technique is used to measure the spark channel temperature. The temperature measurement for discharge channels plays an important role in studying the mechanism of long sparks and natural lightning, in which cases the high-speed schlieren technique is usually applied. However, the high-speed schlieren images are noisy, and the discharge channel axis is not discernibly determined from the discrete pixels, which can sometimes cause huge errors using the traditional inversion algorithm. This may be the reason why two-dimensional (2D) temperature fields of long sparks are rarely reported at present. To fill the gap, an improved inversion algorithm is proposed, in which the dichotomy and the high order total variation (TV) regularization methods are introduced. The proposed algorithm is verified to have better performance compared with the traditional ones by numerical tests. At last, 2D temperature fields of discharge channels are reconstructed and discussed.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0263-2241
1873-412X
DOI:10.1016/j.measurement.2021.109620