Abstract
Boron particles have been considered most attractive fuel for ducted rockets because of their high combustion heat per unit mass in air. For boron as a fuel, the C* combustion efficiency increased with increasing pressure. Therefore, it is important to clarify the relationship between the time and pressure to combust boron particles. Experimental studies indicated that the combustion of boron particles always occurs in two consecutive stages and with a very distinctive characteristic. The first-stage combustion is believed to be associated with the burning of the boron particles while they are still covered with a pre-existing boron oxide layer. The second-stage combustion is generated by fully-fledged combustion of bare boron particles. In this study, two-stage combustion times and luminous flame diameters of single boron particles were measured with the electric furnace at elevated pressures. The result was the two-stage combustion times of single boron particles decreased with increasing the pressure.
Published Version
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