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International Journal of Automotive Technology > Volume 6(6); 2005 > Article
International Journal of Automotive Technology 2005;6(6): 563-570.
NUMERICAL STUDY OF DROPLET VAPORIZATION AND COMBUSTION AT HIGH PRESSURE AND HIGH TEMPERATURE
J.-Y. KOO, J.-B. KO
Hankuk Aviation University
ABSTRACT
A numerical study of high pressure and temperature droplet vaporization and combustion is conducted by formulating one dimensional evaporation model and single-step chemical reaction in the mixture of hydrocarbon fuel and air. The ambient pressure ranged from atmospheric conditions to the supercritical conditions. In order to account for the real gas effect on fluid p-v-T properties in high pressure conditions, the modified Soave-Redlich-Kwong state equation is used in the evaluation of thermophysical properties. Some computational results are compared with Sato's experimental data for the validation of calculations in case of vaporization. The comparison between predictions and experiments showed quite a good agreement. Droplet surface temperature increased with increasing pressure. Ignition time increased with increasing initial droplet diameter. Temporal or spatial distribution of mass fraction, mass diffusivity, Lewis number, thermal conductivity, and specific heat were presented.
Key Words: Droplet vaporization and combustion, Droplet surface temperature, Ignition time, Thermal conductivity
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