Abstract
Boron suspension fuel is considered a good candidate to meet the energy requirements of hypersonic aircraft. As a solid-liquid mixed fuel, its combustion is a complex multi-stage process coupling of solid boron and liquid JP-10 combustion affected by various factors. In this study, A CO2 laser ignition test system was used to obtain the combustion characteristics of boron suspension fuel with solid loading of 10 wt.% in O2/Ar atmosphere. Focus is placed on the key factor of oxygen supply on the evolution of its solid-liquid coupling combustion characteristics. Theoretical analysis of the underlying mechanism of oxygen transportation and consumption caused by boron and JP-10 and their coupling characteristics was carried out for different stages. The results indicate that the combustion process could be divided into ignition, evaporation combustion, agglomerate combustion and extinguishment under full oxygen supply. In ignition stage, boron particles first ignite and promote the rapid ignition of JP-10. Oxygen supply can transfer boron combustion from heterogeneous reaction into homogeneous combustion. In evaporation combustion stage, a clear competition for oxygen between JP-10 and boron is observed. JP-10 is the main oxygen consumer whose flame forms an oxygen-lean zone around the droplet and suppresses boron combustion within the area. Micro-explosion could help carry boron particles into the outer oxygen-rich zone and achieve single-particle combustion. Increasing oxygen content to 60% can effectively compress the oxygen-lean zone area and realize simultaneous combustion of boron and JP-10. Agglomerate combustion stages could only occur when oxygen content is higher than 80%, which is the main energy releasing stage of boron. In extinguishment stage, black smoke is observed due to incomplete combustion of JP-10 when oxygen content is less than 60% while white smoke is observed due to boron oxide cooling deposition. This study provides a reference for the full energy exploitation of boron suspension fuel.
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