Abstract
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.
Highlights
In recent years, the planar laser-induced fluorescence (PLIF) technique, a modern optical diagnostic method with high spatial and temporal resolution, has developed rapidly in the field of combustion diagnosis [1,2,3]
The aim of this paper is to report the successful application of PLIF technique to an industrial burner, which is beneficial to promoting development of the PLIF technique, and solving some engineering problems
The displacement velocity of the flame is extracted from time-resolved sequences OH-PLIF images
Summary
The planar laser-induced fluorescence (PLIF) technique, a modern optical diagnostic method with high spatial and temporal resolution, has developed rapidly in the field of combustion diagnosis [1,2,3]. Many experimental results can be found in the literature regarding both qualitative characterizations of flame structure and quantitative measurements of interesting features, such as concentration, temperature, and velocity [4,5,6,7,8]. Most successful applications are confined to the ideal environment of the laboratory, regardless of the impact of the external environment, i.e., variables such as temperature, humidity, and vibration on the PLIF system. Small flame scales and an ideal environment provide convenience for the study of the mechanism, but if a harsh experiment environment and larger flame scale exist, this poses a great challenge to the PLIF system. A high-speed OH-PLIF system is capable of imaging flame structures and demonstrating dynamic evolution [12,13], but when faced with bench tests, terrible problems come with it. Due to low laser energy output and the high requirements of the working environment, the commercial high-speed
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call