Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Hwang, Joonsik

Committee Member

Bhushan, Shanti

Committee Member

Mun, Sungkwang

Date of Degree

8-7-2025

Original embargo terms

Visible MSU Only 1 year

Document Type

Graduate Thesis - Campus Access Only

Major

Mechanical engineering

Degree Name

Master of Science (M.S.)

College

James Worth Bagley College of Engineering

Department

Michael W. Hall School of Mechanical Engineering

Abstract

This study investigates the spray behavior of Tier 3 gasoline in gasoline direct injection engines using experimental methods. Tier 3 gasoline, formulated with lower sulfur content, enhances aftertreatment system efficiency and supports cleaner combustion. A comparative fuel property analysis between Tier 3 gasoline and PACE-20, surrogate fuel, was conducted to understand compositional effects on spray. A constant volume spray chamber and optical diagnostics, including diffuse back-illumination extinction, Schlieren, microscopic, and 3D CT reconstruction imaging, were used to examine spray morphology under varying injection conditions. Key spray parameters such as liquid volume fraction, projected liquid volume, droplet size, and cone angle were evaluated. Machine learning models were developed to predict fuel mass, optical rate of injection, and injection current profiles. The results provide insight into optimizing fuel injection strategies by integrating experimental diagnostics and predictive modeling, contributing to cleaner combustion and serving as a valuable dataset for CFD validation.

Sponsorship (Optional)

Aramco America

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