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

Handle URI:
http://hdl.handle.net/10754/575899
Title:
Experimental and numerical analysis for high intensity swirl based ultra-low emission flameless combustor operating with liquid fuels
Authors:
Vanteru, Mahendra Reddy ( 0000-0002-1651-6357 ) ; Katoch, Amit; Roberts, William L. ( 0000-0003-1999-2831 ) ; Kumar, Sudarshan
Abstract:
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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center; Mechanical Engineering Program
Publisher:
Elsevier BV
Journal:
Proceedings of the Combustion Institute
Conference/Event name:
30th International Symposium on Combustion
Issue Date:
21-Jun-2014
DOI:
10.1016/j.proci.2014.05.070
Type:
Conference Paper
ISSN:
1540-7489
Sponsors:
Authors acknowledge the support received from 'Aeronautics Research and Development Board' (ARDB), Bangalore, India through Grant-in-Aid scheme.
Appears in Collections:
Conference Papers; Physical Sciences and Engineering (PSE) Division; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorVanteru, Mahendra Reddyen
dc.contributor.authorKatoch, Amiten
dc.contributor.authorRoberts, William L.en
dc.contributor.authorKumar, Sudarshanen
dc.date.accessioned2015-08-25T06:18:39Zen
dc.date.available2015-08-25T06:18:39Zen
dc.date.issued2014-06-21en
dc.identifier.issn1540-7489en
dc.identifier.doi10.1016/j.proci.2014.05.070en
dc.identifier.urihttp://hdl.handle.net/10754/575899en
dc.description.abstractFlameless 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.en
dc.description.sponsorshipAuthors acknowledge the support received from 'Aeronautics Research and Development Board' (ARDB), Bangalore, India through Grant-in-Aid scheme.en
dc.publisherElsevier BVen
dc.titleExperimental and numerical analysis for high intensity swirl based ultra-low emission flameless combustor operating with liquid fuelsen
dc.typeConference Paperen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentMechanical Engineering Programen
dc.identifier.journalProceedings of the Combustion Instituteen
dc.conference.date2004-07-25 to 2004-07-30en
dc.conference.name30th International Symposium on Combustionen
dc.conference.locationChicago, IL, USAen
dc.contributor.institutionIndian Inst Technol, Dept Aerosp Engn, Bombay 400076, Maharashtra, Indiaen
kaust.authorRoberts, William L.en
kaust.authorVanteru, Mahendra Reddyen
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