Dynamic modeling of an integrated sofc hybrid propulsion system with variable power distribution

In the field of propulsion technology for large commercial aircraft, hybrid-electric propulsion systems have become a focal point of current research. Traditional turbofan engine components are highly thermodynamically coupled. The integration of electric motor systems has the potential to improve energy efficiency and enhance operational flexibility, especially when optimized at the system level. This study focuses on single-aisle regional aircraft and innovatively proposes a hybrid propulsion system based on variable power distribution. The system combines a solid oxide fuel cell (SOFC) with a dual-shaft turbine-less engine fuelled by methane, where the compressor is directly powered by the SOFC and the high and low-pressure spool speeds are decoupled by a power distribution system. To achieve precise evaluation of system dynamic performance, a component-level dynamic model of the SOFC hybrid propulsion system is developed based on thermodynamic principles and multidimensional coupled simulation methods. The transient simulation module comprehensively integrates dynamic effects including SOFC electrochemical dynamics and rotor inertia. The simulation results quantitatively characterize the influence of various transient effects on system dynamic response across acceleration and deceleration process, with particular emphasis on comparative analysis of safety performance evolution during acceleration/deceleration transients. This systematic investigation provides valuable insights and design guidelines for the configuration optimization of future aircraft hybrid propulsion systems.