PDF Modelling of Autoignition in Nonpremixed Turbulent Flows
作者:
K. N. LAKSHMISHA,
B. ROGG,
K. N. C. BRAY,
期刊:
Combustion Science and Technology
(Taylor Available online 1995)
卷期:
Volume 105,
issue 4-6
页码: 229-243
ISSN:0010-2202
年代: 1995
DOI:10.1080/00102209508907752
出版商: Taylor & Francis Group
关键词: Autoignition;nonpremixed turbulent combustion;probability density function methods
数据来源: Taylor
摘要:
This paper presents the formulation and results of numerical simulation of autoignition in gaseous, nonpremixed, turbulent flows. Two specific problems are considered, (a) a homogeneous, isotropic turbulence with chemical reactions and mixing, and (b) an axisymmetric, fuel jet released into an oxidiser environment. For the first problem the fluid mechanics and combustion are decoupled, while the second problem fully incorporates such a coupling. A hybrid computational approach is adopted wherein the governing mean flow and the κ — ϵ equations are solved through a finite-volume, predictor-corrector, pressure implicit code TURBO-2D and the joint scalar pdf-transport equation (pdf= probability density function) is simulated via a Monte Carlo technique. The flow code and the pdf code togelher run in tandem with each other. The fluid dynamics code supplies the mean flow and turbulence quantities to the pdf code. The pdf code, in turn, provides the mean mass density via the mean thermochemical scalars to the fluid dynamics code.
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