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Energy Efficiency: Tranverse Jet Instabilities & Control

Advanced Propulsion: Detonations, ionized gases, and turbulent combustion

Alternative Fuels: Acoustically Coupled Droplet Combustion

Rocket Propulsion: Transcritical Coaxial Jet Instabilities

Past


Hypersonic Flight Testing: Phoenix Testbed

Aerospace Safety: Hydrogen Leak Detection

Combustion Generated Air Pollutants: Lobed Fuel Injector

Hazardous waste Incineration: Resonant Dump Combustor

Aerospace Propulsion: In-flight Imaging of Transverse Jets



Researchers:
Prof. Owen Smith, Prof. Ann Karagozian, Dario Valentini (grad), Andres Vargas (undergrad), Ari Ekmekji (undergrad)

Former Researchers: Phuoc Hai Tran (grad), Brett Lopez (undergrad), Cristhian Sevilla (grad), Jeff Wegener (grad), Dr. Sophonies Teshome (grad), Aaron Sung (undergrad), Kelvin Chen (undergrad), Ian Schultz (undergrad), James Umali (undergrad), 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 (undergrad)

Research Supported By:

NASA Glenn

AFRL


  Shoji Sevilla Ekmekji
 

(l-r) Takeshi Shoji, Cris Sevilla, and Ari Ekmekji with the fuel droplet experiment

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 loud speakers placed at either end of the guide. 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 acoustically coupled combustion characteristics of a range of condensed fuels. Combustion of several alternative liquid fuels is under exploration, including ethanol, methanol, aviation fuels, and blends of aviation fuel and liquid synthetic fuel derived from natural gas via the Fischer-Tropsch process.

 

Publications:

  1. Droplet Combustion in the Presence of Acoustic Excitation, Sevilla-Esparza, C. I., Wegener, J. L., Teshome, S., Rodriguez, J. I., Smith, O. I., and Karagozian, A. R., accepted for publication in Combustion and Flame, Vol 161, pp. 1604-1619, 2014.

  2. Fuel Droplet Combustion in the Presence of Acoustic Excitation, Wegener, J., Teshome, S., Sevilla, C., Smith, O. I., and Karagozian, A. R., 23rd International Congress of Theoretical and Applied Mechanics, Beijing, China, August 19-24, 2012.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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

  9. 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.

  10. Control 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.

  11. Acoustical 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, 2001.

  12. Numerical 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

 

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