
ASPIRE -- An Innovative Hypersonic Propulsion Paradigm

C. MacLeod et al. (2019), JBIS, 72, pp.90-101
Refcode: 2019.72.90
Keywords: : Scramjet, Pulse detonation engine, ASPIRE, Hypersonic, Propulsion, Pellets, Air fuel mixing
Abstract:This paper reports the results of a theoretical study into an innovative scramjet-like hypersonic propulsion system. The
method, named ASPIRE (Air-breathing Supersonic Pellet Injection Rotary Engine), aims to overcome one of the main
limitations of the traditional scramjet cycle – poor mixing and therefore inadequate combustion of air and fuel. The
proposed system achieves this by redirecting the main airflow, injecting encapsulated or localised fuel throughout the
engine-duct mixing volume and then switching the main airflow back on – this then engulfs and mixes with the fuel. The
results presented here include design calculations, simulations and mathematical modelling. These show that the system
performs well in simulation and gives excellent theoretical results for air-fuel mixing and airflow dynamics. A road-map to
a working engine is also outlined.
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