In-Situ species measurements of ethylene oxidation in a nanosecond pulsed plasma discharge by using mid-IR absorption spectroscopy

Mruthunjaya Uddi, Joseph Lefkowitz, Bret Windom, Yiguang Ju

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

10 Scopus citations

Abstract

A miniature Herriott cell consisting of 12.7 mm OD protected gold mirrors with 24 laser passes has been developed for in-situ measurements of temperature and species in a chemical reactor integrated with a nanosecond-pulsed plasma discharge. A wavelength tunable external cavity mode-hop free quantum cascade laser (EC-MHF-QCL) near 7.6 μm accessing the fundamental absorption bands of targeted molecules has been used. Quantitative measurements of temperature, CH4, H2O, and C2H2 in a uniform plasma discharge of both C2H4/O2/Ar and C2H4/Ar mixtures were conducted at 60 torr and 296 K initial temperature as a function of plasma discharge frequency. Wavelength modulation has been employed to achieve high species sensitivity for absorbance less than 0.02. Path-averaged plasma temperature, with an uncertainty of ±12 K, is measured by using two ro-vibrational lines of H2O at 1338.5 cm-1 and 1339.15 cm-1. The results show that there is a decrease in C2H2 and CH4 concentrations in the presence of O2 as compared to the non-oxidative case as the plasma discharge frequency is increased beyond 1 kHz, indicating increased reactivity of the intermediate species possibly due to increased O atom concentration. Comparison with a plasma mechanism can help better understand the plasma combustion kinetics.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
StatePublished - Aug 19 2013
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: Jan 7 2013Jan 10 2013

Publication series

Name51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
CountryUnited States
CityGrapevine, TX
Period1/7/131/10/13

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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    Uddi, M., Lefkowitz, J., Windom, B., & Ju, Y. (2013). In-Situ species measurements of ethylene oxidation in a nanosecond pulsed plasma discharge by using mid-IR absorption spectroscopy. In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 (51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013).