Document Type

Thesis - Open Access

Award Date

2018

Degree Name

Master of Science (MS)

Department / School

Mechanical Engineering

First Advisor

Jeffrey Doom

Abstract

Computational fluid dynamics tool has been employed in the past to determine and analyze efficiency or performance in combustion engines and for combustion analysis. This paper represents a systematic investigation on the best model predicts the temperature and soot production in coflow jet flame, by applying various RANS turbulent model, soot models and radiation models in presence or absence of gravity. It also applies this model predicted in crossflow jet flame and investigates the velocity ratio (ratio of the velocity of fuel jet to the velocity of air stream) variation effect on temperature and soot production. ANSYS-Fluent CFD software tool was utilized for this study. For the co-flow jet result, one-step soot model, SST turbulent model and Rosseland radiation model with gravity was in a reasonable agreement with the Coppalle and Joyeux [50] experimental data that it was compared with. The crossflow jet was simulated with the best model predicted in the coflow, and variation of velocity ratio of fuel jet and air stream was investigated. The results showed that increase in velocity of fuel jet increased temperature and soot volume fraction, which is as a result of an increase in heat released in the reaction zone when fuel concentration increases (velocity of fuel increases) and leading to significant increase in soot production as temperature increases. It was also observed that as the fuel jet velocity/concentration increases, its maximum temperature and soot volume fraction, get further away from the proximity of jet inlet. The effect of mixing of fuel and air streams was also analyzed.

Library of Congress Subject Headings

Combustion -- Mathematical models.
Turbulence -- Mathematical models.
Flame -- Mathematical models.

Description

Includes bibliographical references

Format

application/pdf

Number of Pages

96

Publisher

South Dakota State University

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Rights Statement

In Copyright