Chugging Instability of H2O2 Monopropellant Thrusters with Reactor Aspect Ratio and Pressures

Preheating characteristics of H2O2 monopropellant thruster using manganese oxide catalyst

“…This caused an improvement in the rising time, because less time was then required to increase the chamber pressure to the averaged chamber pressure. According to An and Kwon [1] and Jo et al [11], the increased reactivity of catalyst also caused an improvement in the pressure instability. However, the increase in reactivity with increasing preheating temperature reduced exponentially according to the Arrhenius equation.…”

“…In Eq. (2), t 95 and t 5 are the times when the chamber pressures are 95% and 5% of the average chamber pressure, respectively t r = t 95 − t 5 (2) Pressure instability (I ) is defined in Eq. (3).…”

“…This injector is composed of 15 orifices, each having a diameter of 0.4 mm. The catalyst bed sizing follows the empirical method proposed by An and Kwon [2], which http://dx.doi.org/10.1016/j.ast.2014.12.010 1270-9638/© 2014 Elsevier Masson SAS. All rights reserved.…”

“…Therefore, in the present study, we selected MnO 2 with an alumina support as the catalyst. The catalyst preparation method was adopted from An et al [1]. Detailed characterization of the prepared catalysts was carried out using an accelerated surface area and porosimetry system (ASAP 2020) and a BrunauerEmmet-Teller (BET) system and by energy dispersive spectroscopy (EDS).…”

“…Therefore, the key technology of a monopropellant thruster is the catalyst, and consequently, numerous research groups on monopropellant thrusters have focused on catalysts, in terms of aspects such as * catalyst reactor design [2], catalyst reactivity and supports [3,19,21], catalyst additives [6,10,20], and catalyst poisoning [16]. In general, a monopropellant thruster is exposed to lowtemperature conditions because it is used mainly in space or a high-altitude environment.…”