Studies of C2H6 air and C3H8/ air plasma assisted combustion kinetics in a nanosecond discharge

Mruthunjaya Uddi, Huijun Guo, Wenting Sun, Yiguang Ju

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

15 Scopus citations

Abstract

The paper presents the studies of ethane and propane/air plasma assisted combustion at a pressure of 60 torr and temperature 300K. O atoms in the plasma have been measured as a function of time after a single discharge pulse using TALIF (Two photon laser induced fluorescence) at 60 torr and temperature of 300 K for these mixtures at various equivalence ratios. A plasma chemistry model of hydrocarbons has been developed. This is done by combining a reduced mechanism of the latest low temperature hydrocarbon mechanism with plasma air chemistry along with plasma and flame NO formation chemistry. The reaction rates of excited nitrogen species with hydrocarbons are not know accurately and have not been included. O atoms measured in air are compared with the new mechanism predictions. The O atom measurements compare well with the mechanism predictions. The O atoms decay slightly faster in the case of ethane than predicted. For the case of propane, the O atoms decay much faster than predicted by the mechanism. A better mechanism for low temperature hydrocarbon combustion is required for the plasma. The O atoms begin chain reactions giving rise to OH and H radicals. H2O is formed during these chain reactions. But soon all the radicals decay in ∼1.5msec. After the end of chain reactions, species such as CH2O, CH4, C2H4, H2O2, O3 begin to accumulate. CO and CO 2 are formed only at the end of these chain reactions through slow oxidation. The mechanism has been used to study ignition by a single discharge for air/fuel mixtures at high temperatures in the range 500-700K and pressures in the range 300-500 torr. An initial mole fraction of O atoms (∼5 x 10 -5) has been added without a nanosecond discharge and the mixture is observed in time. It is found that for higher pressures of ∼ 400torr, 700K, there is a two stage ignition in ∼28msec for stoichiometric air while it is 43msec for same mixture at 300 torr showing that there is a dependence on initial pressure and temperature to be studied to take advantage of the nanosecond discharge.

Original languageEnglish (US)
Title of host publication49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
StatePublished - Dec 6 2011
Event49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Orlando, FL, United States
Duration: Jan 4 2011Jan 7 2011

Other

Other49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
CountryUnited States
CityOrlando, FL
Period1/4/111/7/11

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Fingerprint Dive into the research topics of 'Studies of C<sub>2</sub>H<sub>6</sub> air and C<sub>3</sub>H<sub>8</sub>/ air plasma assisted combustion kinetics in a nanosecond discharge'. Together they form a unique fingerprint.

  • Cite this

    Uddi, M., Guo, H., Sun, W., & Ju, Y. (2011). Studies of C2H6 air and C3H8/ air plasma assisted combustion kinetics in a nanosecond discharge. In 49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition [AIAA-2011-970]