This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Numerical Simulation of Transient Liquid Fuel Sprays Vaporization Under Engine-Like Conditions Using Diffusion Limit and Well Mixed Vaporization Models
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1996 by SAE International in United States
Annotation ability available
The vaporization of n-dodecane sprays during the early stages of the vaporization process under engine-like conditions is studied numerically using Well-mixed (W-M) and diffusion-limit (DL) evaporation models. A spray with Sauter mean radius (SMR) of 12 mm at injection is considered. The initial droplet size distribution is obtained from a χ-squared distribution using a Monte Carlo sampling technique. The initial ambient air pressure and temperature are taken to be 45 bar and 800 K respectively. The effect of the injection velocity on the vaporization process is studied by considering two initial injection velocities 100 and 200 m/s.
A modified version of the finite volume code Kiva-II is used to solve the governing equations for both the gas and the liquid phase. To see the effect of the presence of many droplets in the system on the vaporization of individual droplets the simulation is also performed for the case when the energy and mass exchange between the liquid and gas phase is neglected. The results of the simulation are presented in terms of vaporization history of two selected droplet parcels with initial diameters of 22 and 50 mm at injection, and in terms of temperature and velocity distribution of the gas phase along the chamber axis. The vaporized amount of fuel and penetration depth of the liquid phase as functions of time are also presented. The study concludes that for the range of parameters studied, the adequate simulation requires employment of the DL-model.
CitationAl Omari, S., "Numerical Simulation of Transient Liquid Fuel Sprays Vaporization Under Engine-Like Conditions Using Diffusion Limit and Well Mixed Vaporization Models," SAE Technical Paper 960877, 1996, https://doi.org/10.4271/960877.
- Takagi T. Fang C. Y. Kamimoto T. Okamoto T. Numerical Simulation of Evaporation, Ignition and Combustion of Transient Sprays Combust. Sci. and Tech. 75 1 12 1991
- Faeth G. M. Evaporation and Combustion of Sprays Prog. Energy Combust. Sci. 9 1 76 1983
- Sirignano W. A. An integrated Approach to Spray Combustion Model Development Combust. Sci. Tech. 58 231 251 1988
- Sirignano W. A. Fuel Droplet Vaporization and Spray Combustion Theory Prog. Energy Combust. Sci. 9 291 322 1983
- Law C. K. Recent Advances in Droplet Vaporization and Combustion Prog. Energy Combust. Sci. 8 171 201 1982
- Amsden A. A. O'Rouke P. J. Butler T. D. Kiva II:M A Computer Program for Chemically Reactive Flows with Sprays Los Alamos Report LA 11560 MS 1989
- Klingsporn M. Renz U. Vaporization of Binary Unsteady Spray At High Temperature and High Pressure Int. J. Heat Mass Transfer 37 265 272 1994
- Kneer R. Schneider M Noll B. Wittig W. Diffusion Controlled Evaporation of a Multicomponent Droplet: Theoretical Studies on the Importance of Variable Liquid Properties Int. J. Heat Mass Transfer 36 2403 2415 1993
- Landis R. B. Mills A. F. Effect of internal Diffusional Resistance on the Evaporation of Binary Droplets 5th Int. Heat Transfer Conf. Tokyo 345 349 1974