Date of Degree
MS (Master of Science)
Thermal management is a major concern of jet engine development. During flight, engine components reach extreme temperatures as a result of frictional heating due to elevated airflow velocities. Jet fuel is used as a coolant to dissipate heat throughout the engine. This cooling process induces temperature and pressure increases within the fuel. At temperatures above 325°F, hydrocarbon fuels start to become thermally unstable, leading to the formation of solid deposits, known as coke. This paper outlines an experimental study that was conducted to further examine the coking mechanism. Specifically, a complete experimental setup and procedure was designed to simulate coke deposit formation in a controlled laboratory environment. Fuel was thermally stressed up to 330°C at 10 Bar for approximately 6 hours. Tests were conducted using plain Jet-A fuel and Jet-A fuel with 0.1% carbon nanoparticle and nanotube additives. Deposit formation on stainless steel samples were analyzed using Scanning Electron Microscopy imaging. Results showed that the introduction of nano-additives into the fuel yielded less deposit formation and build up on stainless steel surfaces. Both nanoparticles (100 nm diameter) and nanotubes (8 – 15 nm diameter, 0.5 – 2 μm length) were found to be effective at suppressing coke deposits above 300°C.
Copyright © 2016 Matthew James Panzer