Owen Smith, Prof.
Ann Karagozian, Sophonias Teshome (grad), Jeff Wegener (grad), Cris Sevilla (grad), Aaron Sung (undergrad), Kelvin Chen (undergrad)
Former Researchers: Jennifer Smolke (undergrad), Dr. Juan Rodriguez (grad), Alec Pezeshkian (undergrad), Dr. Srinivasan Dattarajan, Andy Lutomirski,
Hann Mao (undergrad), Dr. Chaouki Ghenai (postdoc), Dr. Heon-Chang Kim (postdoc), Robert Lobbia
Prof. Owen Smith (right)
and graduate student Srinivasan Dattarajan (left) making adustments
This study focuses on quantifying and understanding the effects
of external acoustical perturbations on condensed phase combustion
processes. In the present configuration, a burning liquid fuel
droplet is suspended within an essentially one-dimensional acoustic
waveguide where standing waves of variable frequency and amplitude
are generated by a loud speaker placed at the end of the guide.
Focus has been placed in the past on normal and micro gravity experiments on
excitation conditions in which the droplet is situated at either:
1) a velocity antinode (pressure node), where the droplet experiences
the greatest effects of velocity perturbations, or 2) at a velocity
node (pressure antinode) where the droplet is exposed to minimal
velocity fluctuations. The effects of the amplitude and frequency
of excitation, the droplet position relative to pressure/velocity
perturbation maxima, and conditions leading to increased burning
rates are identified.
This research program is designed to understand and quantify the
effects of pressure oscillations on the combustion characteristics
of a range of condensed fuels. Combustion of a number of alternative liquid fuels is under exploration, including ethanol, methanol, aviation fuels, and blends of aviation fuel and liquid synthetic fuel derived from coal gasification via the Fischer-Tropsch process..
- Droplet Combustion in the Presence of Altered Acceleration Fields via Acoustic Excitation, Teshome, S., Smith, O. I., and Karagozian, A. R.*, Western States Section/The Combustion Institute Fall Meeting, Paper 09F-82, UC Irvine, October, 2009.
- Acoustically Driven Droplet Combustion with Alternative Liquid Fuels, Rodriguez, J. I., Mao, H.-S., Teshome, S., Pezeshkian, A., Smith, O. I., and Karagozian, A. R., 46th AIAA Aerospace Sciences Meeting, Paper AIAA-2008-1002, January, 2008.
- Acoustically Coupled Droplet Combustion with Alternative Fuels, 3. Rodriguez, J. I., Smith, O. I., and Karagozian, A. R., 5th U.S. National Combustion Meeting, Paper G09, March 25-28, 2007.
Acoustic Excitation of Droplet Combustion in Microgravity and Normal
Gravity, Dattarajan, S., Lutomirski, A., Lobbia, R., Smith, O. I., and Karagozian,
A. R., Combustion and Flame, Vol. 144, Issues 1-2, pp. 299-317, January, 2006.
- Acoustical Excitation of Burning Fuel Droplets in Normal
Gravity and Microgravity, Dattarajan, S., Lutomirski, A.,
Lobbia, R., Smith, O.I., and Karagozian, A.R., AIAA Paper AIAA-2004-0955,
42nd AIAA Aerospace Sciences Meeting, January, 2004.
- Acoustic Excitation of Droplet Combustion in Microgravity,
Dattarajan, S., Lutomirski, A., Lobbia, R., Smith, O.I., and Karagozian,
A. R., Paper 03F-15, Western States Section/The Combustion Institute
Fall Meeting, UCLA, October, 2003
- Droplet Combustion Control for Microgravity Experiments,
Lobbia, R., Dattarajan, S., Smith, O. I., and Karagozian, A. R.,
Bulletin of the American Physical Society, November, 2001.
of Droplet Combustion via Acoustical Excitation, Ghenai,
C., Lobbia, R., Dattarajan, S., Smith, O. I., and Karagozian,
A. R., Paper 47, 2nd Joint Meeting of the U.S. Sections
of the Combustion Institute, March, 2001.
Excitation of Burning Fuel Droplets, Ghenai, C., Lobbia,
R., Smith, O. I., and Karagozian, A. R., AIAA Paper no. 2001-0328,
39th AIAA Aerospace Sciences Meeting, January,
Simulations of Acoustically Driven, Burning Droplets,
Kim, H.-C., Karagozian, A. R., and Smith, O. I., Paper 99F-50,
Western States Section/The Combustion Institute Fall Meeting,
October 26, 1999