Analysis of Relationship between Entropy Generation and Soot Formation in Turbulent Kerosene/Air Jet Diffusion Flames

摘要

A comprehensive study of turbulent combustion is carried out to analyze the relationship between entropy generation and soot formation in turbulent vaporized kerosene/air jet diffusion flames. Dealing with the laminar flamelet combustion model for predicting the temperature distribution, the Moss-Brookes-Hall model is applied for estimating the soot formation. The radiation heat transfer and turbulent flow are simulated employing the discrete ordinates model and the realizable k-e turbulence model, respectively. There are credible agreements between the present results of mean temperature, soot volume fraction, and mean mixture fraction and the available experimental data. Results show that the chemical reaction process has the biggest role in the computation of entropy generation while the other processes including viscous dissipation, mass diffusion, and heat conduction can be neglected. The main region of soot formation can directly be predicted by the entropy generation with an acceptable deviation. Also, the surface growth has the major role in the soot formation among the various processes.