Large Eddy simulation of a reacting kerosene spray in hot vitiated cross-flow
File(s)s10494-022-00355-5.pdf (5.61 MB)
Published version
OA Location
Author(s)
Type
Journal Article
Abstract
The evaporation and combustion characteristics of a kerosene spray injected perpendicularly into a cross-flow of high-temperature vitiated air is investigated. This fundamental flow configuration has wider implications for the future development of ultra-low emission aeronautical combustors, particularly with respect to technologies involving MILD combustion. Large eddy simulations with a Eulerian–Lagrangian framework are performed to investigate the spray evolution and the characteristics of the reaction zone for a range of conditions. For the closure of turbulence-chemistry interactions at the sub-grid scales, a transported probability density function approach solved by the Eulerian stochastic fields method is applied. A configuration based on the use of airblast atomisation is assessed first and compared with experimental observations. The effect of the atomiser air-to-liquid mass flow ratio is studied in greater detail, both in terms of the resulting gas-phase properties and the droplet evaporation process. Then, the effect of ambient pressure on the global spray flame behaviour is examined. For this part of the study, no atomising air is included in the simulation to separate the effects of ambient pressure on the spray from the interaction with the air jet. Analysis of the flame and spray properties at cross-flow operating pressures of 1 atm, 2 bar and 4 bar highlights the strong coupling between the reacting flow and droplet evaporation characteristics, which are highly affected by the penetration of the spray into a flow field characterised by relatively large gradients of temperature. The results reported in this work provide fundamental understanding for the development of novel low-emission combustion technologies and demonstrate the feasibility of applying large eddy simulation with detailed chemistry for the investigation of reacting aviation fuel sprays in hot vitiated cross-flow.
Date Issued
2022-08-20
Date Acceptance
2022-07-25
Citation
Flow, Turbulence and Combustion, 2022, 109, pp.991-1010
ISSN
1386-6184
Publisher
Springer Science and Business Media LLC
Start Page
991
End Page
1010
Journal / Book Title
Flow, Turbulence and Combustion
Volume
109
Copyright Statement
© The Author(s) 2022. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
License URL
Sponsor
Engineering & Physical Science Research Council (E
Commission of the European Communities
Identifier
https://link.springer.com/article/10.1007/s10494-022-00355-5
Grant Number
BH172740 (EP/R029369/1)
831804
Subjects
Science & Technology
Physical Sciences
Technology
Thermodynamics
Mechanics
Air-blast atomisation
Spray flame
Jet A-1 fuel
MILD combustion
Clean aviation
LES-PDF
FUEL COMBUSTION CHEMISTRY
PHYSICS-BASED APPROACH
FLAME STRUCTURE
JET
AUTOIGNITION
MODELS
LES
Mechanical Engineering & Transports
Fluids & Plasmas
09 Engineering
Publication Status
Published
Date Publish Online
2022-08-20