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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISSN: 2688-7231 (Online)

Effect of Burner Diameter and Diluents on Structure and Stability of Co-flow Laminar Diffusion Flames of Diluted Methane Fuel

Anurag Mishra
Department of Mechanical Engineering, IIT Delhi, 110016, India

Purushottam Ranga
Department of Mechanical Engineering, IIT Delhi, 110016, India

Pushan Sharma
Department of Mechanical Engineering, IIT Delhi, 110016, India

Bisrat Yoseph
Department of Mechanical Engineering, IIT Delhi, 110016, India

Sattwik Laskar
Department of Mechanical Engineering, IIT Delhi, 110016, India

Mayank Kumar
Department of Mechanical Engineering, IIT Delhi

Anjan Ray
Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India

DOI: 10.1615/IHMTC-2019.1550
pages 925-930

Abstract

The present research work has been carried out to study the flame structure of nitrogen-diluted methane flames in a laminar non-premixed oxygen-enhanced co-flow configuration system. A wide range of experiments are performed using nitrogen as a diluent with methane in jet for oxygen percentage variation in co-flow with two different burners of 4 and 9-mm diameter. The fuel stream is modeled by mixing methane and nitrogen gases. The oxidizer is modeled by mixing oxygen and nitrogen gases where the oxygen concentration level is varied from 100 % to blow-off. The fuel compositions diluted with nitrogen is varied from 12-100 % of methane and jet flow rate is maintained at 0.5 liter per minute (LPM) throughout all experiments. The co-flow rate is kept at 10 LPM for all the cases. A high co-flow rate makes the flame more stable, and it may sustain till a higher fuel dilution level. The flame length is measured under the influence of oxygen enrichment level. From experimental studies, it is found that the flame length for both 4-mm and 9-mm burner is highly sensitive to change in oxygen percentage in the oxidizer stream.

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