Fuel density effect on near nozzle flow field in small laminar coflow diffusion flames

Handle URI:
http://hdl.handle.net/10754/566114
Title:
Fuel density effect on near nozzle flow field in small laminar coflow diffusion flames
Authors:
Xiong, Yuan ( 0000-0001-5328-3487 ) ; Cha, Min Suk ( 0000-0003-4059-3421 ) ; Chung, Suk-Ho ( 0000-0001-8782-312X )
Abstract:
Flow characteristics in small coflow diffusion flames were investigated with a particular focus on the near-nozzle region and on the buoyancy force exerted on fuels with densities lighter and heavier than air (methane, ethylene, propane, and n-butane). The flow-fields were visualized through the trajectories of seed particles. The particle image velocimetry technique was also adopted for quantitative velocity field measurements. The results showed that the buoyancy force exerted on the fuel as well as on burnt gas significantly distorted the near-nozzle flow-fields. In the fuels with densities heavier than air, recirculation zones were formed very close to the nozzle, emphasizing the importance of the relative density of the fuel to that of the air on the flow-field. Nozzle heating influenced the near-nozzle flow-field particularly among lighter fuels (methane and ethylene). Numerical simulations were also conducted, focusing specifically on the effect of specifying inlet boundary conditions for fuel. The results showed that a fuel inlet boundary with a fully developed velocity profile for cases with long tubes should be specified inside the fuel tube to permit satisfactory prediction of the flow-field. The calculated temperature fields also indicated the importance of the selection of the location of the inlet boundary, especially in testing various combustion models that include soot in small coflow diffusion flames. © 2014 The Combustion Institute.
KAUST Department:
Clean Combustion Research Center
Publisher:
Elsevier BV
Journal:
Proceedings of the Combustion Institute
Issue Date:
2015
DOI:
10.1016/j.proci.2014.06.025
Type:
Article
ISSN:
15407489
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorXiong, Yuanen
dc.contributor.authorCha, Min Suken
dc.contributor.authorChung, Suk-Hoen
dc.date.accessioned2015-08-12T09:28:52Zen
dc.date.available2015-08-12T09:28:52Zen
dc.date.issued2015en
dc.identifier.issn15407489en
dc.identifier.doi10.1016/j.proci.2014.06.025en
dc.identifier.urihttp://hdl.handle.net/10754/566114en
dc.description.abstractFlow characteristics in small coflow diffusion flames were investigated with a particular focus on the near-nozzle region and on the buoyancy force exerted on fuels with densities lighter and heavier than air (methane, ethylene, propane, and n-butane). The flow-fields were visualized through the trajectories of seed particles. The particle image velocimetry technique was also adopted for quantitative velocity field measurements. The results showed that the buoyancy force exerted on the fuel as well as on burnt gas significantly distorted the near-nozzle flow-fields. In the fuels with densities heavier than air, recirculation zones were formed very close to the nozzle, emphasizing the importance of the relative density of the fuel to that of the air on the flow-field. Nozzle heating influenced the near-nozzle flow-field particularly among lighter fuels (methane and ethylene). Numerical simulations were also conducted, focusing specifically on the effect of specifying inlet boundary conditions for fuel. The results showed that a fuel inlet boundary with a fully developed velocity profile for cases with long tubes should be specified inside the fuel tube to permit satisfactory prediction of the flow-field. The calculated temperature fields also indicated the importance of the selection of the location of the inlet boundary, especially in testing various combustion models that include soot in small coflow diffusion flames. © 2014 The Combustion Institute.en
dc.publisherElsevier BVen
dc.subjectBoundary conditionen
dc.subjectBuoyancyen
dc.subjectLaminar diffusion flameen
dc.subjectRecirculationen
dc.titleFuel density effect on near nozzle flow field in small laminar coflow diffusion flamesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalProceedings of the Combustion Instituteen
kaust.authorXiong, Yuanen
kaust.authorCha, Min Suken
kaust.authorChung, Suk-Hoen
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.