Hybrid Electric Propulsion Systems in Aviation
Summary
Hybrid electric propulsion systems combine conventional gas turbines or piston engines with electric motors and energy storage to reduce fuel burn, emissions and noise in aircraft. Configurations range from series hybrids—where the combustion engine drives a generator feeding electric motors—to parallel systems in which both engine and motor can drive the propulsor. Enhanced power electronics, advanced batteries and thermal management strategies are central to achieving competitive weight and performance. Key objectives include optimising power split between sources, maximising energy density, and integrating robust control architectures to ensure safety and efficiency across diverse flight phases. Progress in modular architectures, lightweight materials and system-level simulation has enabled initial demonstrations in small commuter and rotorcraft platforms. Despite rapid advances, challenges remain in battery technology, thermal regulation of high-power components and certification of novel architectures. Continued interdisciplinary research addresses these hurdles, pointing towards scalable solutions for regional and short-haul aviation that align with global decarbonisation targets.
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Hybrid Electric Propulsion Systems in Aviation publication trend
The graph below shows the total number of articles in hybrid electric propulsion systems in aviation across all publications each year (not limited to Nature Index journals).
Technical terms
Energy density: The amount of energy stored per unit mass of a battery or fuel, typically expressed in watt-hours per kilogram (Wh/kg).
Power-to-weight ratio: A measure of an engine or motor’s power output relative to its mass, indicating its suitability for aviation applications.
Series hybrid configuration: An architecture in which a combustion engine drives an electrical generator exclusively, and electric motors provide propulsive thrust.
Parallel hybrid configuration: A layout where both the combustion engine and electric motor can independently or jointly drive the aircraft’s propulsor.
Thermal management system: The integrated components and controls that dissipate heat from engines, electric machines and power electronics to maintain safe operating temperatures.
References
- Techno-economic-environmental evaluation of aircraft propulsion electrification: Surrogate-based multi-mission optimal design approach. Renewable and Sustainable Energy Reviews (2023).
- Assessment of hydrogen gas turbine-fuel cell powerplant for rotorcraft. International Journal of Hydrogen Energy (2024).
- Electric aviation: A review of concepts and enabling technologies. Transportation Engineering (2022).
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