A detailed numerical study of NOx kinetics in counterflow methane diffusion flames: effects of fuel-side versus oxidizer-side dilution

Par Conseil national de recherches du Canada

Téléchargement	Voir la version finale : A detailed numerical study of NOx kinetics in counterflow methane diffusion flames: effects of fuel-side versus oxidizer-side dilution (PDF, 951 Kio)
DOI	Trouver le DOI : https://doi.org/10.1155/2021/6642734
Auteur	Rechercher : Xu, Huanhuan; Rechercher : Liu, Fengshan¹; Rechercher : Wang, Zhiqiang; Rechercher : Ren, Xiaohan; Rechercher : Chen, Juan; Rechercher : Li, Qiang; Rechercher : Zhu, Zilin
Affiliation	Conseil national de recherches du Canada. Centre de recherche en métrologie
Format	Texte, Article
Résumé	Dilution combustion has been widely utilized due to various merits, such as enhanced efficiency, fewer pollutants emissions, and even a promising future in alleviating global warming. Diluents can be introduced through the oxidizer or fuel side to achieve the desired combustion properties, and H₂O and CO₂ are the most common ones. A comprehensive comparison between the different dilution methods still lacks understanding and optimizes the dilution combustion technologies. This study numerically compared the effects of H₂O and CO₂ dilution in the oxidizer or fuel stream on counterflow methane diffusion flames, emphasizing NO formation kinetics. Results showed that the impact of different radiation heat transfer models on NO emissions diminishes with increasing the dilution ratio. The calculations of radiation heat transfer were treated in three ways: radiation-neglected, optically thin, and using a nongrey radiation model. When keeping the oxygen content and methane fraction constant, CO₂ dilution in the air-side has the most profound influence on NO reduction, and CO₂ dilution in the fuel-side has the least. H₂O dilution showed a medium impact with a larger degree on air-side than that on fuel-side. To gain a deeper understanding of this effect order, the contributions of different NO formation routes were quantified, and analyses were made based on the diluents’ chemical and thermal effects. It was found that the oxidizer-side dilution and fuel-side dilution affect the NO formation pathway similarly. Still, the influence of H₂O dilution on the NO formation pathway differs from that of CO₂ dilution.
Date de publication	2021-03-03
Maison d’édition	Hindawi Limited
Licence	Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/deed.fr
Dans	Journal of Combustion 2021, 6642734.
Note	yes
Langue	anglais
Publications évaluées par des pairs	Oui
Publication du CNRC	Cette publication n’est pas du CNRC Ce sont des publications qui ont été rédigées par un auteur du CNRC, mais avant que celui-ci soit employé du CNRC.
Exporter la notice	Exporter en format RIS
Signaler une correction	Signaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrement	f872d138-7f28-473a-86b4-f4e280e89fd8
Enregistrement créé	2021-04-12
Enregistrement modifié	2021-09-21

Date de modification :: 2024-09-28