Analysis of Spray Flow Pattern and Spray Combustion Characteristics.

概要

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The analysis of spray flow was very important for the spray combus-tion simulation. In this study, the models for the spray pattern and the motion of spray dro-plets in the gas flow were investigated to improve the simulation accuracy. The spray pat-tern was expressed by the random sampling of spray angles from a normal probability de-nsity distribution. The droplet trajectories were calculated by Lagrangian method consider-ing the effect of the velocity fluctuation of turbulent gas flow.<BR>At first, the droplet trajectories for the hollow-cone and full-cone types were simulated successfully in the cold air flow. Next, the effect of the two-staged air ratio on the concen-trations of NO and soot in the exhausted gas of PWM (Pitch-Water mixture) spray combus-tion was investigated. As a result, the optimum combustion condition for the reduction of NO and soot concentrations was found out by the three-dimensional spray combustion simulation to estimate clearly the distribution such as gas velocity vectors, temperature, and gas species concentrations within the furnace.
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