Thermodynamic and transport properties of hydroxylammonium nitrate-based electric solid propellant vapor

Matthew S. Glascock, Patrick D. Drew, Joshua L. Rovey

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Electric solid propellants are advanced solid chemical rocket propellants controlled by electric current. Electric solid propellants may also be used in an electric propulsion system, specifically, an ablative pulsed plasma thruster. Previous experiments with the electric solid propellant HIPEP suggest its ablation processes are similar to traditional propellant polytetrafluoroethylene (C2F4). Better understanding of the ablation and resulting propulsion performance of HIPEP requires a model of its vapor composition and transport properties. This paper reports on the development of such a model. The model was validated by comparing results for C2F4 with literature, which showed agreement with multiple models described. Transport property results matched within an order of magnitude for temperatures less than 15,000 K and equilibrium composition densities matched to within an order of magnitude. The electric solid propellant vapor composition was predicted in the temperature range of 500-40,000 Kelvin at 1 bar pressure. Low temperatures (<2,000 K) are dominated by H2O, CO2 and N2, and results at 700 K match within 10% of previous combustion model predictions. At high temperatures (>25,000 K) the vapor is strongly ionized and dominated by C2+, O2+, N2+, and H+ ions. The viscosity of the electric solid propellant vapor is on the order of 10-4 kg/m/s and thermal conductivity is on the order of 10 W/m/K.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
StatePublished - 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: Jan 7 2019Jan 11 2019

Publication series

NameAIAA Scitech 2019 Forum


ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego

ASJC Scopus subject areas

  • Aerospace Engineering


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