Mechanical Engineering (B.S.)
Document Type and Release Option
Thesis (open access)
An investigation was led to determine the correlations between the durations of Ignition Delay (ID), Combustion Delay (CD), Derived Cetane Number (DCN), Negative Temperature Coefficient (NTC), Low-Temperature Heat Release (LTHR) regions, ringing intensity, and precent mass burn, and the effect of blending the Fischer-Tropsch (F-T) synthetic aerospace fuel (SAF), iso-paraffinic kerosene (IPK), with petroleum derived Jet-A aerospace fuel on these regions. Neat blends of Jet-A and IPK and three by mass blends of the fuels will be researched. These blends include mass percentages of 75%Jet-A and 25%IPK (75Jet-A25IPK), 50%Jet-A 50%IPK (50Jet-A50IPK), and 25%Jet-A 75%IPK (25Jet-A75IPK). The study will utilize a PAC CID 510 constant volume combustion chamber (CVCC) using the ASTM D7668-14.a standard. It was discovered that blends containing more by mass amounts of IPK had exponentially larger ID and CD, thus causing the DCN of the fuel blends to exponentially decrease. IPK also influenced the LTHR and NTC regions heavily as the fuel blends that contained larger amounts of IPK had a profound increase in the duration of both regions. Additionally, the blends that contained 50% or more by mass amounts of IPK had little to no ringing events occurring after HTHR, indicating a greater combustion stability. Finally, it was found that the energy released during the LTHR region of all the blended fuel’s burn was larger than that of the neat blends. This is due to IPK causing an extended LTHR region, while the Jet-A present in the fuel is releasing more energy during the extended LTHR duration.
This thesis investigates the LTHR and NTC regions of a synthetic aerospace fuel (SAF), iso-paraffinic kerosene (IPK), petroleum derived Jet-A aerospace fuel and three by mass blends of the the two fuels.
Smith, Richard C. III, "INVESTIGATIONS OF THE NEGATIVE TEMPERATURE COEFFICIENT REGION OF SUSTAINABLE AVIATION FUELS FOR MITIGATION OF GLOBAL WARMING" (2021). Honors College Theses. 658.