Affiliation:
1. Nonequilibrium Thermodynamics Laboratory, Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210, USA
Abstract
This work describes the kinetic mechanism of coupled molecular energy transfer and chemical reactions in low-temperature air, H
2
–air and hydrocarbon–air plasmas sustained by nanosecond pulse discharges (single-pulse or repetitive pulse burst). The model incorporates electron impact processes, state-specific N
2
vibrational energy transfer, reactions of excited electronic species of N
2
, O
2
, N and O, and ‘conventional’ chemical reactions (Konnov mechanism). Effects of diffusion and conduction heat transfer, energy coupled to the cathode layer and gasdynamic compression/expansion are incorporated as quasi-zero-dimensional corrections. The model is exercised using a combination of freeware (Bolsig+) and commercial software (ChemKin-Pro). The model predictions are validated using time-resolved measurements of temperature and N
2
vibrational level populations in nanosecond pulse discharges in air in plane-to-plane and sphere-to-sphere geometry; temperature and OH number density after nanosecond pulse burst discharges in lean H
2
–air, CH
4
–air and C
2
H
4
–air mixtures; and temperature after the nanosecond pulse discharge burst during plasma-assisted ignition of lean H
2
-mixtures, showing good agreement with the data. The model predictions for OH number density in lean C
3
H
8
–air mixtures differ from the experimental results, over-predicting its absolute value and failing to predict transient OH rise and decay after the discharge burst. The agreement with the data for C
3
H
8
–air is improved considerably if a different conventional hydrocarbon chemistry reaction set (LLNL methane–
n
-butane flame mechanism) is used. The results of mechanism validation demonstrate its applicability for analysis of plasma chemical oxidation and ignition of low-temperature H
2
–air, CH
4
–air and C
2
H
4
–air mixtures using nanosecond pulse discharges. Kinetic modelling of low-temperature plasma excited propane–air mixtures demonstrates the need for development of a more accurate ‘conventional’ chemistry mechanism.
Subject
General Physics and Astronomy,General Engineering,General Mathematics
Cited by
49 articles.
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