The University of Southampton
University of Southampton Institutional Repository

# Turbulence-chemistry interaction in lean premixed hydrogen combustion

Aspden, A.J., Day, M.S. and Bell, J.B. (2015) Turbulence-chemistry interaction in lean premixed hydrogen combustion. Proceedings of the Combustion Institute, 35 (2), 1321-1329.

Record type: Article

## Abstract

This paper presents three-dimensional direct numerical simulations of lean premixed hydrogen flames at an equivalence ratio of varphi=0.4 over a range of turbulence levels from Ka=1 - 36. The simulations form part of a larger effort to construct a DNS database that can be used by the community for model construction and validation. We have focussed on producing well-resolved simulations at conditions representative of atmospheric laboratory-scale flames. After an overview of phenomenological trends with increasing Karlovitz number, we examine the factors that lead to an observed decorrelation between fuel consumption and heat release in the flame at Ka=36. We show that in this flame the fuel consumption is greatly enhanced in regions of positive curvature. We also show that the radical pool is enriched throughout the entire flame as $\Ka$ is increased. In particular, we identify three reactions that, driven by high molar concentrations of radicals at low temperatures, are responsible for high levels of heat release away from regions of fuel consumption, thereby accounting for the observed decorrelation between fuel consumption and heat release.

Text
aspdenPCI35.pdf - Accepted Manuscript

e-pub ahead of print date: 26 September 2014
Published date: 2015
Organisations: Applied Mathematics

## Identifiers

Local EPrints ID: 394229
URI: http://eprints.soton.ac.uk/id/eprint/394229
ISSN: 1540-7489
PURE UUID: 98110e0c-7781-42ce-8502-f1dde7df0862

## Catalogue record

Date deposited: 13 May 2016 08:10

## Contributors

Author: A.J. Aspden
Author: M.S. Day
Author: J.B. Bell