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A numerical study on the influence of airstream dilution and jet velocity on NO emission characteristics of CH4 and DME bluff-body flames

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Title A numerical study on the influence of airstream dilution and jet velocity on NO emission characteristics of CH4 and DME bluff-body flames
 
Creator ROY, RN
SREEDHARA, S
 
Subject CONDITIONAL MOMENT CLOSURE
DIFFUSION FLAME
TURBULENT COMBUSTION
NONPREMIXED FLAMES
DIMETHYL ETHER
CARBON-DIOXIDE
CH4/H-2 FLAME
MODEL
Conditional moment closure
Bluff-body
Di-methyl-ether (DME)
NO emission
 
Description In this paper, a bluff-body flame structure has been modeled using conditional moment closure model (CMC) to study the effect of airstream dilution with CO2 and H2O on nitric oxide (NO) production. This scenario would mimic the effect of exhaust gas recirculation (EGR) in an internal combustion (IC) engine or in a gas turbine. A 2D in-house code, employing a k-epsilon turbulence model with modified constant C-epsilon 1, has been used to calculate the flow and mixing field. Methane (CH4) and di-methyl-ether (DME) have been separately used as fuels to assess the performance. Fuel jet velocities are varied to investigate the effectiveness of these dilutions at different levels of turbulence-chemistry interactions. The presence of both CO2 and H2O in the airstream reduced the NO quantity for both the fuels. The effectiveness of the H2O diluent on mass basis is more prominent in reducing NO. With the increased fuel velocity, a situation similar to increased injection pressure in IC engines, higher amounts of diluents caused near extinction of the flame. For the same amount of diluents, global NO reduction in DME is higher compared to that for methane. (C) 2014 Elsevier Ltd. All rights reserved.
 
Publisher ELSEVIER SCI LTD
 
Date 2016-01-14T13:46:41Z
2016-01-14T13:46:41Z
2015
 
Type Article
 
Identifier FUEL, 142,73-80
0016-2361
1873-7153
http://dx.doi.org/10.1016/j.fuel.2014.10.061
http://dspace.library.iitb.ac.in/jspui/handle/100/17651
 
Language en