Monte Carlo PDF modelling of a turbulent natural-gas diffusion flame
作者:
P.A. Nooren,
H.A. Wouters,
T.W.J. Peeters,
D. Roekaerts,
U. Maas,
D. Schmidt,
期刊:
Combustion Theory and Modelling
(Taylor Available online 1997)
卷期:
Volume 1,
issue 1
页码: 79-96
ISSN:1364-7830
年代: 1997
DOI:10.1080/713665231
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A piloted turbulent natural-gas diffusion flame is investigated numerically using a 2D elliptic Monte Carlo algorithm to solve for the joint probability density function (PDF) of velocity and composition. Results from simulations are compared to detailed experimental data: measurements of temperature statistics, data on mean velocity and turbulence characteristics and data on OH. Conserved-scalar/constrained-equilibrium chemistry calculations were performed using three different models for scalar micro-mixing: the interaction by exchange with the mean (IEM) model, a coalescence/dispersion (C/D) model and a mapping closure model. All three models yield good agreement with the experimental data for the mean temperature. Temperature standard deviation and PDF shapes are generally predicted well by the C/D and mapping closure models, whereas the IEM model gives qualitatively incorrect results in parts of the domain. It is concluded that the choice of micro-mixing model can have a strong influence on the quality of the predictions. The same flame was also simulated using reduced chemical kinetics obtained from the intrinsic low-dimensional manifold (ILDM) approach. Comparison with the constrained-equilibrium results shows that the shape of the OH concentration profiles is recovered better in the ILDM simulation, and that the ILDM reduced chemical kinetics can correctly predict super-equilibrium OH.
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