Effect of Burner Wall Material on Microjet Hydrogen Diffusion Flames near Extinction: A Numerical Study

Aravind Muraleedharan, Jithin Edacheri Veetil, Akram Mohammad, Sudarshan Kumar and Ratna Kishore Velamati
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Aravind Muraleedharan: Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Ettimadai 641112, India
Jithin Edacheri Veetil: Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
Akram Mohammad: Department of Aerospace Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Sudarshan Kumar: Department of Aerospace Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
Ratna Kishore Velamati: Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Ettimadai 641112, India

Energies, 2021, vol. 14, issue 24, 1-24

Abstract: Characteristics of microjet hydrogen diffusion flames stabilized near extinction are investigated numerically. Two-dimensional simulations are carried out using a detailed reaction mechanism. The effect of burner wall material, thickness, and thermal radiation on flame characteristics such as flame height and maximum flame temperature are studied. Results show that the flame stabilizes at lower fuel jet velocities for quartz burner than steel or aluminum. Higher flame temperatures are observed for low conductive burners, whereas the flame length increases with an increase in thermal conductivity of the burner. Even though thermal radiation has a minor effect on flame characteristics like flame temperature and flame height, it significantly influences the flame structure for low conductive burner materials. The burner tip and its vicinity are substantially heated for low conductive burners. The effect of burner wall thickness on flame height is significant, whereas it has a more negligible effect on maximum flame temperature. Variation in wall thickness also affects the distribution of H and HO 2 radicals in the flame region. Although the variation in wall thickness has the least effect on the overall flame shape and temperature distribution, the structure near the burner port differs.

Keywords: micro diffusion flame; extinction; flame stability; radiation; burner wall (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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