Parametric Optimization and Performance Assessment of a Mild Hybrid Propulsion System for a Single-Aisle and Regional Aircraft

Abstract

While several studies have explored the mild hybrid turbofan idea, there is currently a lack of parametric representation of these types of systems in the conceptual literature. Parts of the mild hybridization problem have been studied by other authors, and some integrated system studies attempted, but there remains a lack of fully-integrated aircraft and propulsion system models and modeling capabilities which can facilitate parametric design space exploration. This paper extends, integrates, and synthesizes previously-developed ideas into a parametric system-level analysis. A unique methodology is developed for modeling and simulating a mild hybrid turbofan architecture, and two test cases are proposed and explored for an advanced tube-and-wing aircraft with targeted entry into service in the 2030-2035 time frame. The model developed will be used to optimize the system utilizing a surrogate model approach, and key sensitivities will be identified with respect to design variables, technology parameters, and other key modeling assumptions. Potential fuel burn reduction benefits of the system are identified along with areas of future work, including model fidelity improvements and system uncertainty reduction.