Innovative approaches for reducing CO₂ emissions of aviation engines part 1: Selection of promising approaches

Innovative approaches for significantly reducing the aviation Greenhouse Gas (GHG) emission need to be evaluated based on simple calculation methodology, viz. Numerical Propulsion System Simulation (NPSS) that can be easily and reliably executed by an academic research group with guidance provided by a panel of experts from industry, FAA, NASA, DOE and DOD. Part 1 of this series of papers gives a summary on several topics including the need to reduce the aviation greenhouse gas (GHG) emissions, to use the alternate low carbon fuels, to develop target CO₂ goal for the FAA propulsion system study and on-going technology programs providing alternatives in place of the simple Brayton cycle for contrail mitigation leading finally to the proposed advanced Brayton cycles for undertaking an extensive study under the FAA program. These studies are described in Parts 2 through 6 presented at the 10^th International Energy Conversion Engineering Conference, IECE.