Hybrid Engines and Propulsion: Latest Advances and Prospects

Dear Colleagues,

Considering the ambitious goals for environmentally responsible and sustainable transportation, electrification offers promising solutions to reducing dependence on fossil fuels and optimising the energy consumption of future aircraft. However, achieving fully electric propulsion requires significant advancements in energy storage technologies, which are unlikely to occur within the next 2-3 decades. In the interim, hybrid solutions are viewed as an intermediate step, providing a bridge between conventional gas turbines and electric propulsion technologies. Furthermore, the integration of energy storage solutions with fuel cells has the potential to revolutionise the design and operation of gas turbines, addressing their inherent challenges in terms of efficiency, stability, and longevity for a wide range of flight operation scenarios. Various hybrid configurations, in which gas turbines, together with electric motors, provide propulsion power, are currently under thorough investigation within the aeronautical community.

In this context, this Special Issue, entitled "Hybrid Engines and Propulsion: Latest Advances and Prospects" focuses on exploring concepts, technologies, and the synergies inherent in innovative hybrid propulsion architectures.

The scope of this Special Issue includes, but is not limited to, the following topics:

• Hybrid propulsion system architectures;
• Novel hybrid cycles and engine configurations;
• Propulsion electric machines and power electronics;
• Electric power distribution and protections;
• Fuel cell systems;
• Energy storage;
• Energy management strategy;
• Thermal management system;
• Propulsion system modelling and simulation.

Dr. Enalou Hossein Balaghi
Prof. Dr. Serhiy Bozhko
Prof. Dr. Christopher Gerada
Guest Editors

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• electrification
• hybrid propulsion
• energy storage
• fuel cell
• thermal management system
• electric power train