Science and Technology of Energetic Materials

Vol.74, No.1 (2013)

Research paper

Mechanism of high burning rate of HAN-based solution
Toshiyuki Katsumi, Tomo Inoue, and Keiichi Hori


In order to elucidate the mechanism of extremely high burning rates of some Hydroxylammonium Nitrate (HAN)based solutions, the combustion characteristics of HAN aqueous solutions were studied. It was found that the role of the two-phase region is very important and the intense boiling of water by superheat is responsible for the high burning rate. The evaluated bubble nucleation rate coincides with burning rate at very high region. Further, the combustion mechanism of propellant solution is discussed. Hydrodynamic instability was taken into account and the pressure dependency of the instability was estimated. The estimation of hydrodynamic instability supports the observed phenomena. It was found that the instability is strongly affected by Markstein number.

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combustion mechanism, hydroxylammonium nitrate, linear burning rate, nucleation rate, hydrodynamic instability

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