Keywords

Shock Tube, Hydrogen, High Pressure, Ignition Delay

Abstract

Ignition delay times for hydrogen-air mixtures under engine-relevant conditions were measured using the high-pressure shock tube at the University of Central Florida. The ignition behavior of hydrogen under high-pressure, engine-relevant conditions is not well studied, particularly with respect to ignition delay times, due to the limited availability of experimental configurations capable of such high pressures and only recently increased interest in hydrogen internal combustion engine development. This study investigates hydrogen-air mixtures diluted in argon at post-reflected shock pressures of 60 and 100 bar and temperatures between 1042 and 1277 K. It was found that the current chemical kinetic mechanisms agreed with the experimental results, although the mechanisms collectively overpredicted the ignition delay times for mixtures with high fuel concentrations. Additionally, sensitivity analysis and reaction pathway investigations were performed to provide further insight into the reactions leading to ignition.

Completion Date

2026

Semester

Spring

Committee Chair

Subith Vasu

Degree

Master of Science in Aerospace Engineering (M.S.A.E.)

College

College of Engineering and Computer Science

Department

MAE

Format

PDF

Document Type

Thesis

Identifier

DP0053256

Release Date

5-15-2027

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Available for download on Saturday, May 15, 2027

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