Kumar, R. N. (1975) Further experimental results on the structure and acoustics of turbulent jet flames. AIAA Papers, AIAA 75-523. AIAA . http://resolver.caltech.edu/CaltechAUTHORS:20101216-111045073
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The structure of open turbulent jet flames is experimentally studied in the context of their noise emission characteristics. The differences between premixed and (co-flow) non-premixed flames are explored. Recent experiments repeated in an anechoic chamber complement earlier results obtained in a hard-walled bay. The reactants (methane and enriched air) are burned in the premixed, or non-premixed, mode after a length of pipe flow (ℓ/D> 150). The thick-walled tubes anchor the flames to the tip at all of the velocities employed (maximum velocity, well over 300 ft/sec), thus eliminating uncertainties associated with external flameholders. The time-averaged appearance of the flames is obtained with still photographs (1160 sec). The detailed structures are revealed through high-speed (≈ 2500 frames/sec) motion pictures. The acoustic outputs of the flames are mapped with a condenser microphone. The recorded data are played back to obtain the amplitude, waveshapes, directionalities, and frequency spectra of the noise. Profound differences are found between the premixed and non-premixed flames in their structures and noise characteristics.
|Item Type:||Report or Paper (Report)|
|Additional Information:||© American Institute of Aeronautics and Astronautics. Inc., 1975. The author continues to feel deeply grateful to the Solid Propellant Engineering Section at JPL for allowing the use of their experimental facilities. He specially thanks Mr. Warren Dowler for his enthusiastic encouragement at all stages. The author thanks Messrs. Emilio Sovero and David Daly for technical assistance and Mr. Paul Massier for allowing the use of the anechoic chamber. This research project was initiated by Professor F. E. C. Culick.|
|Group:||Guggenheim Jet Propulsion Center|
|Other Numbering System:|
|Official Citation:||Further experimental results on the structure and acoustics of turbulent jet flames KUMAR, R. N., California Institute of Technology, Pasadena, Calif. AIAA-1975-523 American Institute of Aeronautics and Astronautics, Aero-Acoustics Conference, 2nd, Hampton, Va., Mar 24-26, 1975, 16 p.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||17 Dec 2010 18:33|
|Last Modified:||26 Dec 2012 12:46|
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