Fugine cycle theory: Predicting high efficiency of the supermultijet-convergence engine working from startup to hypersonic scram mode

A new signle-point compression principle based on super multijets colliding with pulsation (Naitoh et al, 2010～2014) has an impressive potential for engendering a new single lightweight engine (Fugine) capable of operating over a wide range of Mach numbers from startup to the hypersonic regime with high thermal efficiency and low noise for hypersonic aircars, while this principle can also improve traditional turbofan and ram-scram jet engines and generates small engines for automobiles and personal power generators with high efficiencies. Flow experiments using a shocktube, combustion tests of two prototype engines, and computational fluid dynamics with a chemical reaction model clarify the potential of high thermal efficiency and stability of this engine system. Especially, in this report, the physical cycle theory based on compressible flow mecahnics and thermodynamics shows high thermal efficiency over 60% at the maximum, even for small engines at stoichiometric condition.