- Author
-
Jiang, L. Y.
|
Yimer, I.
|
Campbell, I.
|
Liu, Z.
|
Liu, Z. S.
|
Huang, C.
|
fisher, C.
|
Schwartzman, A.
|
Zhang, J.
- Title
- Study of Combustion Noise Reduction in a Kerosene Burner: Investitgation of Nozzle and Pre-Heating Chamber Flow-Field.
- Coporate
- National Research Council of Canada, Ottawa, Ontario
- Report
-
NRCC-46729,
- Book or Conf
- Combustion Canada 2003. Proceedings. September 22-25, 2003,
Vancouver, B.C.,
1-12 p.,
2003
- Keywords
-
burners
|
keorsene
|
noise (sound)
|
combustion
|
nozzles
|
flow fields
|
equations
|
fuel sprays
|
droplets
|
heating
|
tubes
- Identifiers
- Phase Doppler Particle Anzlyser (PDPA); nozzle spray PDPA measurement; computational domain; physical modeling; boundary conditions; flow field with and without the inner tube
- Abstract
- The 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.