Study of combustion noise reduction in a kerosene burner : investigation of nozzle and pre-heating chamber flow-field

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ConferenceCombustion Canada 2003: 22 September 2003, Vancouver, B.C.
Pages112; # of pages: 12
Subjectcombustion noise, burner, flow field, nozzle, computer modeling; Combustion
AbstractThe combustion noise generated in a small burner was successfully reduced by installing a short tube inside the pre-heating chamber of the burner. To understand the noise reduction mechanism, the flow-field of the nozzle and pre-heating chamber with and without the inner tube was numerically studied in conjunction with some experimental measurements. The fuel spray characteristics obtained from Phase Doppler Particle Analyser (PDPA) measurements were used to define initial conditions of the spray discrete phase. Couplings between the continuous and discrete phases, as well as the turbulent stochastic effect were modelled. It is found that the installation of an inner tube in the pre-heating chamber modifies the flow-field, fuel spray trajectories, and reduces local velocities and turbulent strength. These contribute to the reduction in combustion noise. Most of all, the considerable modification of the fuel spray distribution in the pre-heating chamber plays a major role in the combustion noise reduction of the burner. In addition, the numerical results also show that the flow-field in the vicinity of the nozzle is very complicated and practically identical for both cases. A strong toroidal vortex is formed in the centre region of the nozzle, and a high velocity swirling airflow is observed outside the core region.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NoteAlso published as a paper at the 3rd NRC CFD Group Symposium on CFD, HPC and VR on Dec. 4, 2003 in Ottawa, Ontario
Peer reviewedYes
NRC number46729
NPARC number20378531
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Record identifier3fa0b94d-e1aa-496d-96c7-302075de5799
Record created2012-07-24
Record modified2016-05-09
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