The model of gaseous fuel and air mixing, developed by the authors, is applied here to calculate maximum mixing times of propane and air. The degree of mixing is determined using the mass fraction of fuel while the rate of mixing is determined from the rate of this mass fraction. The values of both these parameters are local, i.e., measured within an infinitesimal element of fluid. A Eulerian representation is used. The model is based on the assumption that both fuel and air behave as a single chemical species. It is further assumed that pressure is low and only fuel and air are present within the fluid element. Under nonreacting conditions, the model is valid anywhere in the combustor. Under reacting conditions, the model is valid within those combustor regions where the fuel–air mixture is not flammable. The results of this analysis show that mixing times of propane and air are most reduced by high gradients of temperature and velocity, as long as these gradients provide in phase contribution. To a lesser degree, high gradients of pressure also help reduce mixing times. High initial pressure and temperature increase mixing time. Mixing with air penetration into the fuel flow is slower than with propane dispersion into the surrounding air. In general, the exact mixing time has to be determined numerically. Nevertheless, the analytical solutions included here provide maximum mixing times of propane and air under most conditions. These results provide important guidelines for the development of high intensity, high efficiency, and low emission combustors.
Skip Nav Destination
e-mail: akgupta@eng.umd.eud
Article navigation
January 2001
Technical Papers
Determination of Propane and Air Maximum Mixing Times
D. Brasoveanu,
D. Brasoveanu
The Combustion Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
Search for other works by this author on:
A. K. Gupta
e-mail: akgupta@eng.umd.eud
A. K. Gupta
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
The Combustion Laboratory, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
e-mail: akgupta@eng.umd.eud
Contributed by the Fuels & Combustion Technology 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 FACT Division, Jan. 31, 2000; final revision received by the ASME Headquarters, Feb. 15, 2000. Associate Editor: S. R. Gollhalli.
J. Eng. Gas Turbines Power. Jan 2001, 123(1): 226-230 (5 pages)
Published Online: February 15, 2000
Article history
Received:
January 31, 2000
Revised:
February 15, 2000
Citation
Brasoveanu , D., and Gupta, A. K. (February 15, 2000). "Determination of Propane and Air Maximum Mixing Times ." ASME. J. Eng. Gas Turbines Power. January 2001; 123(1): 226–230. https://doi.org/10.1115/1.1338946
Download citation file:
Get Email Alerts
Cited By
Numerical Investigation of CO and NO Production From Premixed Hydrogen/Methane Fuel Blends
J. Eng. Gas Turbines Power (April 2025)
An Efficient Uncertainty Quantification Method Based on Inter-Blade Decoupling for Compressors
J. Eng. Gas Turbines Power (April 2025)
Experimental Design Validation of a Swirl-Stabilized Burner With Fluidically Variable Swirl Number
J. Eng. Gas Turbines Power (April 2025)
Experimental Characterization of a Bladeless Air Compressor
J. Eng. Gas Turbines Power (April 2025)
Related Articles
Combustion Instabilities in Industrial Gas Turbines—Measurements on Operating Plant and Thermoacoustic Modeling
J. Eng. Gas Turbines Power (July,2000)
Influence of Imperfections in Working Media on Diesel Engine Indicator Process
J. Eng. Gas Turbines Power (January,2001)
Experimental and Theoretical Optimization of Combustion Chamber and Fuel Distribution for the Low Emission Direct-Injection Diesel Engine
J. Eng. Gas Turbines Power (January,2003)
A Kinetic Investigation of the Role of Changes in the Composition of
Natural Gas in Engine Applications
J. Eng. Gas Turbines Power (April,2002)
Related Chapters
Combined Cycle Power Plant
Energy and Power Generation Handbook: Established and Emerging Technologies
A Simple Carburetor
Case Studies in Fluid Mechanics with Sensitivities to Governing Variables
Outlook
Closed-Cycle Gas Turbines: Operating Experience and Future Potential