Abstract

A mixture of 1-ethyl-3-methylimidazolium ethyl sulfate ([Emim][EtSO4]) and hydroxylammonium nitrate (HAN) is an energetic monopropellant potentially suitable in a multi-mode chemical-electric microtube-electrospray micro propulsion system. In this work, electrospray plume mass spectra are compared between the monopropellant mixture and neat [Emim][EtSO4]. This comparison clearly indicates new and additional species present in the plume due to the addition of HAN. Mass spectra from 20-600 amu/q were obtained over a variety of angles and flow rates from 2 pL/sec to 3 nL/sec in both cation and anion extraction modes. Mass spectrum dependence on flow rate and angular orientation agree qualitatively well with literature. Results indicate the presence of HAN-based species in anion mode, but no HAN-based species in cation mode. Three of the four monomer species from the monopropellant are apparent in the plume; [Emim]+, [EtSO4]-, and [NO3]- are observed, while [HA]+ is noticeably absent. Results also show emission of both proton transferred covalent forms of HAN: [HA-H] and [HNO3]. Swapping of anion and cation species between the constituents of the monopropellant mixture is also observed.

Department(s)

Mechanical and Aerospace Engineering

Publication Status

Full Access

Comments

National Aeronautics and Space Administration, Grant P200A150309

International Standard Book Number (ISBN)

978-162410590-6

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 American Institute of Aeronautics and Astronautics, All rights reserved.

Publication Date

01 Jan 2019

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