Emissions and effects of climate change have prompted study into fuels that
reduce global dependence on traditional fuels. This study seeks to investigate
engine performance, thermochemical properties, emissions, and perform NVH
analysis of Jet-A and S8 using a single-stage turbojet engine at three engine
speeds. Experimental Jet-A results were used to validate a CFX simulation of the
engine. Engine performance was quantified using thermocouples, pressure sensors,
tachometers, flow meters, and load cells fitted to the engine. Emissions results
were collected using an MKS Multigas Emissions Analyzer that examined CO, CO₂,
H₂O, NOx, and THC. NVH analysis was conducted using a multifield, free-field
microphone, and triaxial accelerometer. This study found that Jet-A operates at
higher temperatures and pressures than S8, and S8 requires higher fuel flow
rates than Jet-A, leading to poorer efficiency and thrust. S8 produced stronger
vibrations over 5 kHz compared to Jet-A. S8 showed a decrease in all measured
emissions. The CFD model was validated, showing an increase in temperature,
pressure, and gas velocity as speed increased. The swirl effect of combustion
was examined, improving atomization. Emissions contours were validated by
experimental results, showing increases in CO₂, H₂O, and NOx, and a decrease in
CO as speed increases.
