High-speed flamefront imaging in premixed turbulent flames using planar laser-induced fluorescence of the CH C−X band

2016 ◽  
Vol 168 ◽  
pp. 66-74 ◽  
Author(s):  
Campbell D. Carter ◽  
Stephen Hammack ◽  
Tonghun Lee
Keyword(s):  
High Speed ◽  
Laser Induced Fluorescence ◽  
Turbulent Flames ◽  
Premixed Turbulent Flames ◽  
Planar Laser Induced Fluorescence ◽  
X Band ◽  
Planar Laser

Flame Imaging of Highly Turbulent Premixed Methane-Air Combustion Using Planar Laser Induced Fluorescence (PLIF) of CH (C-X)

2019 ◽  
Author(s):  
Md. Amzad Hossain ◽  
Md Nawshad Arslan Islam ◽  
Ahsan Choudhuri
Keyword(s):  
Equivalence Ratio ◽  
High Reynolds Number ◽  
Laser Induced Fluorescence ◽  
Experimental Methodology ◽  
Flame Dynamics ◽  
Planar Laser Induced Fluorescence ◽  
X Band ◽  
Planar Laser ◽  
High Reynolds ◽  
Flame Imaging

Abstract The article presents an investigation of CH (C-X) planar laser induced fluorescence imaging (PLIF) of highly turbulent methane-air flames inside a windowed combustor. Flame dynamics and flame growth and evolution of methane-air flames stabilized over a backward facing step at high Reynolds Number (Re) (Re = 15000 and Re = 30000) with an equivalence ratio of 0.7 are discussed. It was observed that the flame evolution was faster at Re = 30000 than that of Re = 15000. The rate of initiation or formation of wrinkles, detachment of the wrinkles and burnout of the burned gases from the flame core increased with the increase in Re. The qualitative flame imaging shows that the width of the flame profile increases as the flame progress towards downstream and the flame becomes thinner as the turbulence level increases. An experimental methodology was developed to optimize the system for excitation, detection of the CH C-X band and post-processing the PLIF images.

scholarly journals Investigation of Flame Evolution in Heavy Oil Boiler Bench Using High-Speed Planar Laser-Induced Fluorescence Imaging

2018 ◽  
Vol 8 (9) ◽  
pp. 1691 ◽  
Author(s):  
Jiangbo Peng ◽  
Zhen Cao ◽  
Xin Yu ◽  
Yang Yu ◽  
Guang Chang ◽  
...  
Keyword(s):  
Heavy Oil ◽  
High Speed ◽  
Combustion Process ◽  
Laser Induced Fluorescence ◽  
Bench Test ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser ◽  
Wrinkled Structure ◽  
Good Agreement

Over recent years, much attention has been paid to the performance evaluation of industrial-type burners. The ignition and stable combustion process are of great significance in assessing the quality of burner. The planar laser-induced fluorescence (PLIF) technique can be applied to heavy oil boilers, extending this technique to engineering applications. Considering the complex environment of the bench test, measures such as temperature control and moisture proofing are made to improve the possibility of detection using PLIF. In this paper, an experimental investigation of flame growth following ignition is reported. A wrinkled structure could be observed from the configuration of the ignition flame; its trajectory will be depicted. The results showed that the wrinkled structure developed downward, i.e., by deviation from the direction of the airflow. The displacement velocity of the flame was used to describe the combustion rate. Good agreement was obtained for the flame shapes of both forced ignition and autoignition. In addition, the center of combustion deviated from the center of boiler, possibly due to some irregularity in the burner’s assembly which was critical to the design of the combustion chamber.

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