Numerical investigation of NOx reduction in a sudden-expansion combustor with inclined turbulent air jet

Axisymmetric sudden-expansion geometry of a co-flowing methane-air diffusion flame is considered to investigate the effect of air inlet conditions on NO x formation, flow field and temperature distribution using the k-ɛ turbulence and β-PDF combustion model. The predicted results are in acceptable a...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2012, 26(11), , pp.3723-3731
Main Authors: Hashemi, S. A., Fattahi, A., Sheikhzadeh, G. A., Hajialigol, N., Nikfar, M.
Format: Article
Language:English
Subjects:
Applied sciences
Combustion. Flame
Control
Dynamical Systems
Energy
Energy. Thermal use of fuels
Engineering
Exact sciences and technology
Industrial and Production Engineering
Mechanical Engineering
Theoretical studies
Theoretical studies. Data and constants. Metering
Vibration
기계공학
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Summary:Axisymmetric sudden-expansion geometry of a co-flowing methane-air diffusion flame is considered to investigate the effect of air inlet conditions on NO x formation, flow field and temperature distribution using the k-ɛ turbulence and β-PDF combustion model. The predicted results are in acceptable agreement with the published experimental and numerical data. The obtained results show that increasing air turbulence intensity results in considerable decrease in NO formation. Increasing the inlet angle of the air causes the NO formation to decrease due to raising vorticity strength. As a new index, the mass-averaged integral of vorticity magnitude is introduced to investigate the effect of altering inlet angle of the air on the flow field.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-012-0848-y