Numerical study of nitrogen oxides chemistry during plasma assisted combustion in a sequential combustor
OPEN ACCESS
Loading...
Author / Producer
Date
2024-02
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
OPEN ACCESS
Data
Rights / License
Abstract
Plasma Assisted Combustion (PAC) is a promising technology to enhance the combustion of lean mixtures prone to instabilities and flame blow-off. Although many PAC experiments demonstrated combustion enhancement, several studies report an increase in NOx emissions. The aim of this study is to determine the kinetic pathways leading to NOx formation in the second stage of a sequential combustor assisted by Nanosecond Repetitively Pulsed Discharges (NRPDs). For this purpose, Large Eddy Simulation (LES) associated with an accurate description of the combustion/NOx chemistry and a phenomenological model of the plasma kinetics is used. Detailed kinetics 0-Dimensional reactors complement the study. First, the LES setup is validated by comparison with experiments. Then, the NOx chemistry is analyzed. For the conditions of operation studied, it is shown that the production of atomic nitrogen in the plasma by direct electron impact on nitrogen molecules increases the formation of NO. Then, the NO molecules are transported through the turbulent flame without being strongly affected. This study illustrates the need to limit the diatomic nitrogen dissociation process in order to mitigate harmful emissions. More generally, the very good agreement with experimental measurements demonstrates the capability of LES combined with accurate models to predict the NRPD effects on both turbulent combustion and NOx emissions.
Permanent link
Publication status
published
Editor
Book title
Journal / series
Volume
260
Pages / Article No.
113206
Publisher
Elsevier
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Plasma assisted combustion; Nanosecond plasma discharges; Nitrogen oxides chemistry; Large-eddy simulation; Turbulent combustion; Multi-physics computation
Organisational unit
09471 - Noiray, Nicolas / Noiray, Nicolas
Notes
Funding
820091 - ThermoacOustic instabilities contRol in sequential Combustion cHambers (EC)
952181 - Center of Excellence in Combustion (EC)
952181 - Center of Excellence in Combustion (EC)