This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Mathematical Model for the Mass Transfer and Combustible Mixture Formation Around Fuel Droplets
Annotation ability available
Sector:
Language:
English
Abstract
The vapor diffusion and the combustible mixture formation around evaporating fuel droplets are studied. The formulas derived for the droplet temperature and vapor concentration profiles take into consideration the unsteady period before the droplet reaches its equilibrium temperature. In this model the droplet is assumed to be suddenly brought into contact with a high temperature oxidizing atmosphere.
The ignition delay is considered equal to the period of time from the start of heating up to the time of formation of a stoichiometric mixture at the ignition location around the droplet.
Computations are made for the temperature history, concentration history, and the ignition delay for iso-octane droplets evaporating in air. The droplet sizes considered are between 1120 and 1520 μ. The air pressure is 14.7 psia, and the air temperatures are 1095-1390 F. The comparison between the results of the present model and previous experimental results showed favorable agreement.
Authors
Citation
Henein, N., "A Mathematical Model for the Mass Transfer and Combustible Mixture Formation Around Fuel Droplets," SAE Technical Paper 710221, 1971, https://doi.org/10.4271/710221.Also In
References
- Bird R. B. Stewart W. E. Lightfoot E. N. “Transport Phenomena.” N. Y. J. Wiley and Sons, Inc. 1960 505
- El-Wakil M. M. Myers P. S. Uyehara O. A. “Fuel Vaporization and Ignition Lag in Diesel Combustion.” SAE Transactions 64 1956
- El-Wakil M. M. Abdou M. I. “The Self-Ignition of Fuel Drops in Heated Air Streams.” Paper 598B SAE Fuels and Lubricants, Powerplant, and Transportation Meeting Philadelphia October 1962
- Faeth G. M. “The Kinetics of Droplet Ignition in a Quiescent Air Environment.” The Pennsylvania State University 1964
- Fuchs N. A. “Evaporation and Droplet Growth in Gaseous Media.” London Pergamon Press 1959 60
- Godsave E. A. E. “Studies of the Combustion of Drops in a Fuel Spray, The Burning of Single Drops of Fuel.” Fourth Symposium (International) on Combustion Baltimore The Williams and Wilkins Co. 1953 818 830
- Hall A. R. Diederichsen J. “An Experimental Study of Burning of Single Drops of Fuel in Air at Pressures up to Twenty Atmospheres.” Fourth Symposium (International) on Combustion Baltimore The Williams and Wilkins Co. 1952 837 846
- Kobayasi K. “An Experimental Study on the Combustion of a Fuel Droplet.” Fifth Symposium (International) on Combustion N. Y. Reinhold Publishing Co. 1955 141 148
- Kumagi S. Isoda H. “Combustion of Fuel Droplets in a Falling Chamber.” Sixth Symposium (International) on Combustion N. Y. Reinhold Publishing Co. 1956 726 731
- Maxwell J. B. “Data Book on Hydrocarbons.” N.Y. Van Nostrand 1950
- Nishiwaki N. “Kinetics of Liquid Combustion Processes: Evaporation and Ignition Lag of Fuel Droplets.” Fifth Symposium on Combustion N. Y. Reinhold Publishing Co. 1955 148 158
- Phillips 66 Reference Data for Hydrocarbons and Petrol-Sulfur Compounds 1962 Phillips Petroleum Co.
- Ranz W. E. Marshall W. R. “Evaporation from Drops.” Chemical Engineering Progress 48 3 1952 141 148
- Williams F. A. “Combustion Theory.” Reading, Mass. Addison-Wesley Publishing Co., Inc. 1965 47 57