• Applied Chemistry for Engineering
• /
• v.34 no.5
• /
• pp.472-478
• /
• 2023

The usage of jet fuel has been increasing with increasing passenger and logistics movements under globalization. CO₂, which is the main global warming gas from aircraft, was charged about 3.5% of total global CO₂ emissions and 12% of transportation fuel emissions. For these reasons, a lot of governments and the international civil aviation organization (ICAO) are trying to reduce CO₂ emissions via the introduction of bio-jet fuel. In this paper, we showed the jet fuel properties, specifications, and presentative production methods of bio-jet fuel such as alcohol to jet (ATJ), oil to jet (OTJ), gas to jet (GTJ) and sugar to jet (STJ). Also, we described the status of global and domestic bio-jet fuel usage and the policy plan for efficient distribution.

• Journal of ILASS-Korea
• /
• v.29 no.3
• /
• pp.140-146
• /
• 2024

This study investigates the application of effervescent nozzles to liquid rockets using a laboratory-scale twin fluids spray test system. Typically, rocket engines using a single liquid propellant control thrust by adjusting the mass flow rate, which is influenced by the spray differential pressure between the fluid pressure at the injector front and atmospheric pressure. As the differential pressure decreases, uneven atomization and combustion instability can occur. To address this issue, this research explores an effervescent nozzle that mixes gaseous and liquid propellants to maintain injection pressure. Experiments were conducted on eight different nozzle types with varying orifice and aerator sizes. The experimental results demonstrated internal pressure variations and differences in spray characteristics based on nozzle design, which were analyzed and discussed. if these injection characteristics are applied in the future, it is expected that they could also be utilized in eco-friendly alternative fuels such as Sustainable Aviation Fuel (SAF).