Comparative effects of plasma and preheating in assisting premixed ammonia/air flames: A DNS study

Shahsavari, Mohammad, Chakraborty, Nilanjan, Zhong, Shenghui, Valera Medina, Agustin ORCID: https://orcid.org/0000-0003-1580-7133 and Jangi, Mehdi 2025. Comparative effects of plasma and preheating in assisting premixed ammonia/air flames: A DNS study. Fuel: The Science and Technology of Fuel and Energy 381 (Part D) , 133645. 10.1016/j.fuel.2024.133645

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Abstract

In this study, Direct Numerical Simulations are utilized to investigate turbulent premixed NH3/air flames assisted by two distinct methods: non-equilibrium nanosecond plasma discharges and preheating, while maintaining equal input energy levels for both methods. The results show that plasma is more effective than preheating in increasing the turbulent burning velocity, namely by up to 31% under lean and by 26% in rich conditions. Furthermore, the flame structure is less affected by turbulence when using plasma. A negative correlation between flame displacement speed and local flame curvature is observed for all cases. Furthermore, negatively curved parts of the flame front are dominated by the reaction mode of combustion. In contrast, the positively curved parts are controlled by flame propagation mode in both preheated and plasma-assisted cases. It is shown that, when plasma is utilized, NO emissions are less sensitive to local heat release rate, and the amount of NO emissions is found to be 19% lower in comparison to the preheated case.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Elsevier
ISSN:	0016-2361
Funders:	EPSRC
Date of First Compliant Deposit:	11 November 2024
Date of Acceptance:	4 November 2024
Last Modified:	28 Nov 2024 15:30
URI:	https://orca.cardiff.ac.uk/id/eprint/173861

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