Burning characteristics and soot formation in laminar methyl methacrylate pool flames

Abstract

This study presents careful measurements from lab-scale experiments and predictions from comprehensive numerical model for the burning characteristics of laminar flames over MMA pools of different diameters with varying ullages or lip heights. Lab-scale experiments for steady burning of MMA pool are conducted, and temperature and concentrations of major species, have been measured for 3 mm ullage case for pool diameters of 25 and 30 mm. A compact kinetic mechanism with 49 species and 376 reactions, and a soot model are used for numerical simulations. Steady burning of laminar flame over an MMA pool is modelled using coupling heterogeneous interface conditions. Variable thermo-physical properties and multi-component diffusion are used. Results from grid-independent numerical simulations compare with reasonable accuracy against experimental measurements. For 25 mm MMA pool, the mass burning rate decreases rapidly from zero to 2 mm ullage and drops relatively gradually with further increase in the ullage. The ratio of mass of soot in the domain to mass of fuel burnt, decreases rapidly with an increase in ullage from zero to 3 mm, remains in same order till 5 mm ullage and then decreases with increasing ullage. Increased flame stand-off from the pool interface and oxygen penetration into the ullage causing partial premixing, form the reasons for the reduction in mass burning rate and decrease in the production of soot. The effects of pool diameter on burning characteristics at three ullages have also been presented.

Keywords:

• MMA pool
• ullage
• soot formation
• mass burning rate
• compact chemical kinetics
• soot model

Acknowledgements

This work has been supported by the Joint Program of the Russian Science Foundation (Project No.16-49-02017) and the Department of Science and Technology of India (Project No. INT/RUS/RSF/P-16). Authors from India acknowledge P.G. Senapathy centre for computing resources, IIT Madras, for providing the computational facility required for the present work.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplemental data

Supplemental data for this article can be accessed at https://doi.org/10.1080/13647830.2020.1822546.

Correction Statement

This article has been corrected with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work has been supported by the Joint Program of the Russian Science Foundation [Project No.16-49-02017] and the Department of Science and Technology of India [Project No. INT/RUS/RSF/P-16].