Rotational Detonation Engines (RDEs) are considered to be new generation propulsion systems that achieve an increase in thermodynamic efficiency, relative to traditional constant pressure combustion-based engines. Although the theoretical and computational models are extensive and predict significant benefits in terms of specific impulse, engine size, and fuel efficiency, practical use so far has been limited because of a number of as yet unresolved engineering issues. The objective of this paper is therefore to close the gap between theoretical potential and practical application by looking at the underlying physics, design limitations, recent successful experiments, and prospects of RDEs. From the analysis, we identify the main hurdles and the paths for progressing RDEs from laboratory demonstrators to flight propulsion systems
