Degree Type

Thesis

Date of Award

2016

Degree Name

Master of Science

Department

Mechanical Engineering

Major

Mechanical Engineering

First Advisor

Terrence R. Meyer

Second Advisor

James B. Michael

Abstract

Fuel injection, vaporization, and mixing results in an extremely complex multiphase flow field that requires extensive experimental study in order to correctly characterize the behavior of combustion systems. Accurately measuring the mass fraction and volume distribution of liquid and vapor phases has been a particularly challenging task. Previous experiments have over predicted local measurements of mole fraction at the interface between regions of liquid and vapor phases. Increasing our knowledge and understanding in this area has great potential for addressing essential requirements for the improvement of combustor and engine design such as reducing emissions, increasing fuel efficiency, and boosting performance. The goal of the current work is to develop a diagnostic strategy that is able to successfully discriminate between the liquid and vapor phases. Laser-induced fluorescence is employed to perform in situ measurements without disturbing the underlying physics of the flow. However, the photophysics of ketones—such as acetone—and aromatic hydrocarbons that are commonly found in fuels are drastically different. A dissimilarity between these two classes of fluorescing molecules that may prove to be a key component in liquid-vapor discrimination is their response to oxygen, and the ensuing effects of collisional quenching. Experiments were performed at the Wright-Patterson Air Force Base investigating the effects of oxygen when present in the surrounding environment as well as when the fuel had been purged with various quantities of oxygen via a technique called sparging. Results are briefly discussed and recommendations for future work are presented.

Copyright Owner

Benjamin Jordan Reuter

Language

en

File Format

application/pdf

File Size

83 pages

Share

COinS