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- 3D Simulation of a Detonation Wave in a Rotating Detonation EnginePublication . Serras, Francisca Antunes; Brojo, Francisco Miguel Ribeiro ProençaThe development of efficient propulsion systems is a critical focus in aerospace engineering, and rotating detonation engines (RDEs) present a promising advancement over conventional propulsion technologies because of their compact configurations and high thermal cycle efficiency. In this dissertation, the results of a three-dimensional simulation of a rotation detonation engine using a mixture of hydrogen and air as fuel are presented and discussed. Results from a simulation using a mixture of hydrogen and oxygen are also presented. The simulations were carried out using ANSYS Fluent and all other details of the methodology used are explained in this work. Key aspects of the simulation include the formulation of turbulence and detonation, the engine operating conditions, and the subsequent impact of these operating conditions on the engine performance itself, namely, the initiation and stabilization of the detonation wave. The computational analysis reveals critical insights into the pressure and temperature fields, flame speed, thrust and specific impulse. Stable engine operation was achieved and the detonation wave made four revolutions around the combustion chamber. It was found that when using a mixture of hydrogen and oxygen, detonation did not prevail and deflagration occurred inside the annular combustion chamber. When using a mixture of hydrogen and air, detonation occurred and the engine went into stable operation. The simulation ran for 10220 time steps giving a fluid simulation time of 1022 microseconds. This research contributes to optimizing engine designs with enhanced performance and future research on this matter. The findings have potential implications for the future development of high-efficiency, low-emission propulsion systems, paving the way for advancements, mostly, in the aerospace sector.