The thesis project has been carried out during an internship at Leonardo Engineers for Integration Srl, and is included in a series of works previously started by the Company in a collaboration with Politecnico di Torino. The goal of the whole project consists on the design and optimization of an internal combustion engine that will be used as a range extender unit in a hybrid vehicle, whose global demand has substantially increased over the last few years. The focus of this thesis project will be on the design of the axial turbocharger that will be coupled to the engine, highlighting in particular the design choices and procedures that led to its definition, and the subsequent virtual validation.