Recombination of electrothermal plasma and decomposition of plasma-exposed propellants

Jianquan Li, Thomas Litzinger, Malay Das, Stefan Thynell

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Information about species involved in initiating ignition of propellents by electrothermal plasma is critical to determining any chemical effect on the enhancement of electro-thermal-chemical gun performance. An experimental study using a triple-quadrupole molecular beam mass spectrometer was conducted to measure species from plasma recombination and from plasma-induced decomposition of propellants (JA2 and M43). The mismatch between the plasma pulse and the sampling time requirement by the mass spectrometer makes direct probing plasma species difficult, requiring the use of a plasma-holding chamber to prolong the event for sampling. The secondary jet evolving from the holding chamber should represent the nature of the plasma jet as it propagates through the propellant bed in actual electro-thermal-chemical applications. Recombination species that can be consistently detected are C2H4, C2H 3, C2H2, CH4, CH3, H 2, and H for a plasma produced within a polyethylene capillary. NO, CO and CO2 are also detectable if sufficient air is present in the chamber or using a Lexan capillary. Species measurements of JA2 and M43 indicate the formation of NO and H2CO during impingement by the jet, which are typical "dark-zone" species observed for these propellants.

Original languageEnglish (US)
Pages (from-to)1353-1361
Number of pages9
JournalJournal of Propulsion and Power
Volume22
Issue number6
DOIs
StatePublished - Nov 1 2006

Fingerprint

propellants
Propellants
recombination
decomposition
Decomposition
Plasmas
plasma
chambers
Mass spectrometers
mass spectrometers
sampling
Lexan (trademark)
spectrometer
Sampling
Plasma jets
chemical effects
Molecular beams
impingement
propellant
plasma jets

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Fuel Technology
  • Mechanical Engineering
  • Space and Planetary Science

Cite this

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abstract = "Information about species involved in initiating ignition of propellents by electrothermal plasma is critical to determining any chemical effect on the enhancement of electro-thermal-chemical gun performance. An experimental study using a triple-quadrupole molecular beam mass spectrometer was conducted to measure species from plasma recombination and from plasma-induced decomposition of propellants (JA2 and M43). The mismatch between the plasma pulse and the sampling time requirement by the mass spectrometer makes direct probing plasma species difficult, requiring the use of a plasma-holding chamber to prolong the event for sampling. The secondary jet evolving from the holding chamber should represent the nature of the plasma jet as it propagates through the propellant bed in actual electro-thermal-chemical applications. Recombination species that can be consistently detected are C2H4, C2H 3, C2H2, CH4, CH3, H 2, and H for a plasma produced within a polyethylene capillary. NO, CO and CO2 are also detectable if sufficient air is present in the chamber or using a Lexan capillary. Species measurements of JA2 and M43 indicate the formation of NO and H2CO during impingement by the jet, which are typical {"}dark-zone{"} species observed for these propellants.",
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Recombination of electrothermal plasma and decomposition of plasma-exposed propellants. / Li, Jianquan; Litzinger, Thomas; Das, Malay; Thynell, Stefan.

In: Journal of Propulsion and Power, Vol. 22, No. 6, 01.11.2006, p. 1353-1361.

Research output: Contribution to journalArticle

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