Abstract
In recent years, research and development on sustainable aviation fuel (SAF) has been conducted by many researchers and aviation industries. In this study, we focused on coconut SAF produced by the co-solvent method, which achieves a minimum emission of waste and a low consumption of energy. The aim of this paper is to clarify the combustion performance of blends of coconut SAF and jet fuel. The combustion experiment was performed using a J-850 jet engine. The applied fuel composition rates were between 10 and 50% coconut SAF in the jet fuel blends. Fuel blends of coconut SAF show higher combustion efficiency than only jet fuel. However, engine performance becomes less effective in the case of increasing the coconut SAF. The reason was that the capric acid methyl and caproic acid methyl, which include the coconut SAF, carbon chain generally improves the ignition quality of the fuel because of the presence of oxygen elements; thus, the turbine inlet temperature increases. Furthermore, we investigate NOx emissions in the case of a blend of coconut SAFs using the NOx emission index (EINOx) prediction method.
https://ror.org/01hvx5h04 
