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Sound Generation from Swirling, Premixed Flames Excited by Helical Flow Disturbances
- Source :
- Combustion Science and Technology. 187:206-229
- Publication Year :
- 2014
- Publisher :
- Informa UK Limited, 2014.
-
Abstract
- This article describes an analysis of the sound generated by swirling premixed flames when excited by helical disturbances, i.e., where the flow fluctuations have an azimuthal dependence of the form and denotes the helical mode number. These results illustrate the sensitivity of local and global sound generation characteristics to mode number, , swirl strength, and dimensionless frequency. An important result is the demonstration that specific mode numbers dominate particular aspects of the flame response. Specifically, particular helical modes dominate the magnitude of local flame wrinkling, , global heat release, , and sound generation, , and are generally not the same. For example, the helical mode that dominates the flame sound radiation, , is a function of flame compactness ratio, , while and are not. For compact, axisymmetric flames, , the axisymmetric, mode dominates the far-field sound radiation, both locally and in terms of global sound power. For and for , other helical modes dominate, generally...
- Subjects :
- Chemistry
General Chemical Engineering
Acoustics
Flow (psychology)
Rotational symmetry
Mode (statistics)
General Physics and Astronomy
Energy Engineering and Power Technology
Magnitude (mathematics)
General Chemistry
Mechanics
Sound power
Physics::Fluid Dynamics
Azimuth
Fuel Technology
Excited state
Physics::Chemical Physics
Dimensionless quantity
Subjects
Details
- ISSN :
- 1563521X and 00102202
- Volume :
- 187
- Database :
- OpenAIRE
- Journal :
- Combustion Science and Technology
- Accession number :
- edsair.doi...........6ef90e2b18fec86c5786e616e7f9ec97