A unified model of gaseous fuel and air mixing is applied here to study the use of shock waves for enhancement of mixing between methane and air. The model uses fuel mass fraction within infinitesimal fluid elements and the total derivative of this fraction with respect to time to measure the degree and rate of mixing, respectively. The model is accurate only for low-pressure combustors since it is based on the ideal gas law. The model is also limited to gaseous fuels that contain single chemical specie, or those that behave like single specie. The model presented here can be applied to any combustor geometry or operational conditions. Results show that mixing can be completed within the narrow region of the shock wave and therefore in a negligibly short time, if pressure, temperature, and velocity distributions within this region are optimized. Furthermore, the combined effects of air preheat and shock waves can enhance both mixing mechanisms with air penetration into the fuel and with fuel dispersion into the surrounding air. These results provide important guidelines for the mixing in supersonic combustors that are required to provide high efficiency and high intensity, while maintaining low levels of pollutants emission.
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January 2003
Technical Papers
Enhancement of Methane-Air Mixing Using Shock and Expansion Waves
D. Brasoveanu,
D. Brasoveanu
The Combustion Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
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A. K. Gupta, Professor and Director
e-mail: akgupta@eng.umd.edu
A. K. Gupta, Professor and Director
The Combustion Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
Search for other works by this author on:
D. Brasoveanu
The Combustion Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
A. K. Gupta, Professor and Director
The Combustion Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
e-mail: akgupta@eng.umd.edu
Contributed by the Fuels and Combustion Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the F&C Division, February 2000; final revision received by the ASME Headquarters April 2002. Associate Editor: S. R. Gollahalli.
J. Eng. Gas Turbines Power. Jan 2003, 125(1): 332-335 (4 pages)
Published Online: December 27, 2002
Article history
Received:
February 1, 2000
Revised:
April 1, 2002
Online:
December 27, 2002
Citation
Brasoveanu , D., and Gupta, A. K. (December 27, 2002). "Enhancement of Methane-Air Mixing Using Shock and Expansion Waves ." ASME. J. Eng. Gas Turbines Power. January 2003; 125(1): 332–335. https://doi.org/10.1115/1.1519274
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