RT Journal Article ID 569f44654d35e74a A1 Katsumi, Toshiyuki A1 Matsuda, Ryuta A1 Inoue, Tomo A1 Tsuboi, Nobuyuki A1 Ogawa, Hiroyuki A1 Sawai, Shujiro A1 Hori, Keiichi T1 COMBUSTION CHARACTERISTICS OF HYDROXYLAMMONIUM NITRATE AQUEOUS SOLUTIONS JF International Journal of Energetic Materials and Chemical Propulsion JO IJEMCP YR 2010 FD 2011-02-27 VO 9 IS 3 SP 219 OP 231 K1 hydroxylammonium nitrate K1 HAN K1 hydrazine K1 monopropellant K1 aqueous solution K1 combustion mechanism K1 burning rate K1 water content K1 nucleation rate K1 superheat AB Hydroxylammonium nitrate (HAN) based liquid propellant has been investigated as a candidate for the monopropellant to be utilized in the reaction control system of satellites as an alternative to hydrazine. This propellant, which consists of ammonium nitrate, methanol, and water, has moderate burning characteristics, sufficiently low freezing temperature, high density, low toxicity, and its density × Isp is 70% higher than hydrazine. In a previous study, the combustion characteristics of the propellants were obtained and found to be very complex. In this paper, the research was focused on the combustion characteristics of HAN aqueous solution. Sample solutions of several concentrations, 95-50 mass %, were prepared. The measurement of linear burning rates, the temperature measurement of the combustion wave, and the observation of combustion phenomena were included in the study. The linear burning rate does not increase monotonically with increasing HAN concentration. The burning rates increase as the HAN concentration increases up to 80 mass %, and decrease as the concentration increases from 80 to 95 mass %. The burning rate peaks at around 80 mass % of HAN concentration. The combustion mode is very complex and is dependent upon composition and pressure. Temperature measurements indicate that the role of the two-phase region is very important, and the boiling of water caused by superheat is responsible for the high burning rate. The relationship between the rate of nucleation of bubbles and the linear burning rate is discussed. PB Begell House LK https://www.dl.begellhouse.com/journals/17bbb47e377ce023,3cb5a5bb07b4b88d,569f44654d35e74a.html