Turbine Electrified Energy Management for Single Aisle Aircraft

Electrified aircraft propulsion technology is being
developed to reduce the environmental impacts of the aviation
industry. This is prompting the exploration of potential uses
and benefits of hybrid systems in which electric powertrains are
integrated with more traditional gas turbine propulsion systems.
Turbine Electrified Energy Management (TEEM) is an energy
management approach for hybrid-electric architectures in which
electric machines are connected to the turbofan shafts and used to
suppress the off-design operation naturally associated with engine
transients. This reduces the need to maintain a large amount of
compressor operability margin, thus allowing further exploration
of the engine design space. In this study, a 19,000 lbf engine within
a parallel hybrid propulsion system is considered along with a
30,000 lbf standalone engine. Data from prior TEEM applications
are used to approximate the electric machine sizing required to
achieve operability benefits. The TEEM controller is shown to
improve operability during transients through the reduction of
stall margin undershoots and the decrease of transient variations
in component performance maps by over 29%.