Parallel-hybrid electric propulsion optimization for regional turboprop aircraft

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Hybrid-electric propulsion has the potential to reduce the fuel consumption of transport aircraft while being much more realistic than full-electric aircraft for conventional missions for the foreseeable future. One potential powertrain architecture is the parallel hybrid-electric system. A generator/motor is added in parallel to conventional turboshaft engines to supplement the engine on the ground or in flight during specific phases. By reducting the gas turbine operation at low efficiency, such as near-idle, a reduction in fuel burn near 30% can be achieved, thus reducing emissions and operating cost. This research project aims at developing the key knowledge to explore and optimize parallel-hybrid electric propulsion for turboprop regional aircraft, both for single and multiengine aircraft configuration. Hybrid-electric powertrain optimization is complex since it is highly coupled with the aircraft, it requires detailed thermal simulation, and no historical trends can support the design process. A parametric, time-marching aircraft and powertrain simulator (second timescale) will be developed to analyse and optimize the system throughout the mission. The simulator will consider failure analysis, thermal management, transient mechanical response, various environmental conditions and mission profiles. In particular, the optimal solutions should comply to current and expected future regulation, such as the available reserve and missed approach. To improve the visualization and exploration of the optimal solutions, this project includes the generation of multidimensional pareto frontiers. The researchers will also perform a detailed electrical simulations (milisecond timescale) to identify potential challenges of the hybrid architecture and identify mitigation actions. Experimental test on an integrated 30 kW and 150 kW test bed will validate individual models. This research projet will benefit Canada as it will provide new business opportunities for Pratt and Whitney Canada (PWC), which aims at commercializing the technology based on the research results in the coming years.