Characterization of laminar flame using high speed camera and spectrometer
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Sådhanå (2020)45:230 https://doi.org/10.1007/s12046-020-01465-4
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Characterization of laminar flame using high speed camera and spectrometer MANASA RAM KOTAL , SOMNATH DE* , SOUMYADEEP DAS and SWARNENDU SEN Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India e-mail: [email protected] MS received 15 April 2018; revised 11 January 2019; accepted 18 March 2019 Abstract. In order to improve flame stabilization in small scale combustors, there have been many research works going on non-premixed as well as on premixed flame. The present experimental study characterizes colour and shape of the premixed and non-premixed flames through a laminar co-flow burner. Various flame behaviors are observed and their stabilization limits are investigated at different fuel–air ratios. The spectroscopic approach becomes suitable method for the measurement of chemiluminescensce for both premixed and diffusion flames. Thus, we can predict the behavior of a combustion process. We observe also the intensity variation of chemiluminescence species, OH*, CH*, and C2* for different fuel-air flow combinations. Apart from that, we have an analysis of colour variance of the premixed flame for different flame locations. Keywords. Non-premixed flame; premixed flame; co-flow laminar burner; Reynolds number; chemiluminescence.
1. Introduction Most of the combustion industries are facing some new challenges in order to increase the efficiency, reliability and flexibility of combustion equipment. To meet those demands we have to focus for better concepts and improved designs. Now a days, new burner optimization and supervision of various types of combustion flames, used in different combustion industries, play a vital role to minimize the difficulties, raised in the industry. These concepts are one of the key technological objectives, which are recognized in surveys and roadmaps proposed for different combustion applications [1]. However, permanent optimization of combustors is currently very limited. Laminar co-flow burner is one of the most useful combustors in these aspects. The simple design with a basic tube-in-tube configuration and minimum maintenance requirement offers a fundamental study on the laminar flames. The observation and control of most practical burners are based on the fossil fuel, apart from the works, which have been carried out on the basis of analysis of flue gases [2]. This system has taken into consideration to achieve the desired excess air or to check the levels of undesirable
This paper is a revised and expanded version of an article presented in ‘‘First International Conference on Mechanical Engineering’’ held at ‘Jadavpur University’, Kolkata, India during January 4–6, 2018 (INCOM-2018).
*For correspondence
emissions (e.g., CO, NOx, particulates). To keep the emission level within the permissible range, modern research has adopted the low NOx combustion, which includes lean premixed combustion [3, 4]. On the other hand, diffusion
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