Abstract
Keywords
Soot, Diffusion flame, Two-color method, Combustion Diesel
Abstract
Turbulent diffusion flames are widely used in industry because of their safety. Nevertheless, their efficiency and the pollution emission depend on the organization of the combustion medium and this fact needs the knowledge on the structure flame. The experimental measurement of the instantaneous and local values of oxygen and fuel in diffusion combustion is very difficult, and sometime, is impossible inside the combustion chamber. So the prediction by the mathematical model is very helpful. A model for calculating of soot formation in turbulent diffusion flames has been established previously. The turbulent nonpremixed combustion process is modeled via the conserved scalar model. The mixture fraction f is chosen as conserved scalar and its distribution is governed by a probability density function (pdf). The soot formation is calculated by Tesner-Magnussen mechanism. The equations system is closed by k- turbulence model. In the present paper the model is tested by experimental data on turbulent diffusion flame of gas oil with 0.1mm nozzle diameter. The injection pressure is changed from 80 bars to 120 bars. Temperature field and soot fraction in the flame are measured by two-color Visioscope. The results show that two-phase state of fuel has a significant effect on accuracy of the model. The coherence between model results and experimental data is obtained when Reynolds number at nozzle is higher than 25,000.