Numerical investigation of buoyancy effects on non-premixed impinging jet flame
Numerical investigation of buoyancy effects on non-premixed impinging jet flame
In this work, buoyancy effects on non-premixing impinging jet flames were studied using three-dimensional direct numerical simulation. The physical problem investigated is a methane jet issuing into an oxidant ambient environment of air with the Reynolds number of 2500 and a nozzle to the downstream impinging plate distance of 4 jet nozzle diameters. The reactive flow field is described by the compressible time-dependent Navier-Stokes equations in its non-dimensional form. A Cartesian grid system with approximately 134 million cells was used with uniform grid distributions in each direction. The comparisons between the buoyant flame and the non-buoyant flame revealed that the two flames have large differences at the primary jet shear layer and the impinging wall regions. Both velocity and temperature distributions demonstrate buoyancy effects on flame dynamics where the flow develops into large vortical structures. It has been found that the buoyant flames involve complex fluid dynamics interactions in addition to flow characteristics associated with the chemical heat release. The vortex dynamics including buoyancy instability under impinging conditions has been investigated.
buoyancy, impinging jet, near-wall reacting flow, direct numerical simulation
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Jiang, X.
008a11fa-f330-4355-b5c6-2878d1ab0f5c
November 2010
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Jiang, X.
008a11fa-f330-4355-b5c6-2878d1ab0f5c
Ranga Dinesh, K.K.J. and Jiang, X.
(2010)
Numerical investigation of buoyancy effects on non-premixed impinging jet flame.
1st International Workshop on Near-Wall Reacting Flows, Darmstadt, Germany.
18 - 19 Nov 2010.
6 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
In this work, buoyancy effects on non-premixing impinging jet flames were studied using three-dimensional direct numerical simulation. The physical problem investigated is a methane jet issuing into an oxidant ambient environment of air with the Reynolds number of 2500 and a nozzle to the downstream impinging plate distance of 4 jet nozzle diameters. The reactive flow field is described by the compressible time-dependent Navier-Stokes equations in its non-dimensional form. A Cartesian grid system with approximately 134 million cells was used with uniform grid distributions in each direction. The comparisons between the buoyant flame and the non-buoyant flame revealed that the two flames have large differences at the primary jet shear layer and the impinging wall regions. Both velocity and temperature distributions demonstrate buoyancy effects on flame dynamics where the flow develops into large vortical structures. It has been found that the buoyant flames involve complex fluid dynamics interactions in addition to flow characteristics associated with the chemical heat release. The vortex dynamics including buoyancy instability under impinging conditions has been investigated.
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Published date: November 2010
Venue - Dates:
1st International Workshop on Near-Wall Reacting Flows, Darmstadt, Germany, 2010-11-18 - 2010-11-19
Keywords:
buoyancy, impinging jet, near-wall reacting flow, direct numerical simulation
Organisations:
Engineering Science Unit
Identifiers
Local EPrints ID: 347903
URI: http://eprints.soton.ac.uk/id/eprint/347903
PURE UUID: ed494209-df7a-4a53-9c3c-7042659205c8
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Date deposited: 13 Feb 2013 12:01
Last modified: 15 Mar 2024 03:46
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Author:
X. Jiang
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