Continuous wave laser gas heating by sustained plasmas in flowing argon

H. Krier, J. Mazumder, T. J. Rockstroh, T. D. Bender, R. J. Glumb

Research output: Contribution to journalArticlepeer-review

Abstract

This paper reports the results of an in-depth study of laser-sustained plasmas in flowing argon for application to laser propulsion. The experiments were performed in a pressurized absorption chamber using a 10 kW CO2 laser. Global absorption measurements have been carried out under a range of laser powers, pressures, and flow rates, indicating a total absorption approaching 80%. Thermocouples have been used to map gas temperatures in the downstream mixing zone. These mappings were used to estimate thermal conversion efficiencies. Thermal efficiency was found to be 6-25%, depending on the pressure, flow rate, and laser power. These thermal efficiencies correspond to radiative losses of 64 and 30%, respectively. Two-dimensional spectroscopic relative-intensity temperature mappings of the plasma core agree spatially with the results of a numerical model. The spectroscopic data indicate peak plasma temperatures of 18,000 K, with the global absorption of laser energy calculated to be 56.2%.

Original languageEnglish (US)
Pages (from-to)1656-1662
Number of pages7
JournalAIAA journal
Volume24
Issue number10
DOIs
StatePublished - Oct 1986

ASJC Scopus subject areas

  • Aerospace Engineering

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