CST_2012.pdf (1.3 MB)
Effects of swirl on intermittency characteristics in non-premixed flames
journal contribution
posted on 2012-10-16, 07:57 authored by K.K.J. Ranga-Dinesh, K.W. Jenkins, M.P. Kirkpatrick, Weeratunge MalalasekeraWeeratunge MalalasekeraSwirl effects on velocity, mixture fraction and temperature intermittency have been analysed
for turbulent methane flames using LES. The LES solves the filtered governing equations on
a structured Cartesian grid using a finite volume method, with turbulence and combustion
modelling based on the localised dynamic Smagorinsky and the steady laminar flamelet
models respectively. Probability density function (pdf) distributions demonstrate a Gaussian
shape closer to the centreline region of the flame and a delta function at the far radial
position. However, non-Gaussian pdfs are observed for velocity and mixture fraction on the
centreline in a region where centre jet precession occurs. Non-Gaussian behaviour is also
observed for the temperature pdfs close to the centreline region of the flame. Due to the
occurrence of recirculation zones, the variation from turbulent to non turbulent flow is more
rapid for the velocity than the mixture fraction and therefore indicates how rapidly turbulence
affects the molecular transport in these regions of the flame.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Citation
RANGA DINESH, K.K.J. ... et al, 2012. Effects of swirl on intermittency characteristics in non-premixed flames. Combustion Science and Technology, 184 (5), pp.629-659.Publisher
© Taylor & FrancisVersion
- AM (Accepted Manuscript)
Publication date
2012Notes
This article was published in Combustion Science and Technology [© Taylor & Francis], available online at: http://www.tandfonline.com/10.1080/00102202.2011.653460ISSN
0010-2202eISSN
1563-521XPublisher version
Language
- en