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Experimental and numerical analysis for high intensity swirl based ultra-low emission flameless combustor operating with liquid fuels

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Title Experimental and numerical analysis for high intensity swirl based ultra-low emission flameless combustor operating with liquid fuels
 
Creator REDDY, VM
KATOCH, A
ROBERTS, WL
KUMAR, S
 
Subject MILD COMBUSTION
BURNER
GAS
Flameless combustion
Swirl flow combustion
Liquid fuel
High intensity
Burner scaling
 
Description Flameless combustion offers many advantages over conventional combustion, particularly uniform temperature distribution and lower emissions. In this paper, a new strategy is proposed and adopted to scale up a burner operating in flameless combustion mode from a heat release density of 5.4-21 MW/m(3) (thermal input 21.5-84.7 kW) with kerosene fuel. A swirl flow based configuration was adopted for air injection and pressure swirl type nozzle with an SMD 35-37 lm was used to inject the fuel. Initially, flameless combustion was stabilized for a thermal input of 21.5 kW ((Q) over dot '''= 5.37 MW/m(3)). Attempts were made to scale this combustor to higher intensities i.e. 10.2, 16.3 and 21.1 MW/m(3). However, an increase in fuel flow rate led to incomplete combustion and accumulation of unburned fuel in the combustor. Two major difficulties were identified as possible reasons for unsustainable flameless combustion at the higher intensities. (i) A constant spray cone angle and SMD increases the droplet number density. (ii) Reactants dilution ratio (R-dil) decreased with increased thermal input. To solve these issues, a modified combustor configuration, aided by numerical computations was adopted, providing a chamfer near the outlet to increase the R-dil. Detailed experimental investigations showed that flameless combustion mode was achieved at high intensities with an evenly distributed reaction zone and temperature in the combustor at all heat intensities. The emissions of CO, NOx and HC for all heat intensities (Phi = 1-0.6) varied between 11-41, 6-19 and 0-9 ppm, respectively. These emissions are well within the range of emissions from other flameless combustion systems reported in the literature. The acoustic emission levels were also observed to be reduced by 8-9 dB at all conditions. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
 
Publisher ELSEVIER SCIENCE INC
 
Date 2016-01-15T05:04:25Z
2016-01-15T05:04:25Z
2015
 
Type Article
 
Identifier PROCEEDINGS OF THE COMBUSTION INSTITUTE, 35(3)3581-3589
1540-7489
1873-2704
http://dx.doi.org/10.1016/j.proci.2014.05.070
http://dspace.library.iitb.ac.in/jspui/handle/100/17828
 
Language en