We present a computational simulation study of non-equilibrium streamer discharges in a coaxial electrode and a corona geometry for automotive combustion ignition applications. The streamers propagate in combustible fuel-air mixtures at high pressures representative of internal combustion engine conditions. The study was performed using a self-consistent, two-temperature plasma model with finite-rate plasma chemical kinetics. Positive high voltage pulses of order tens of kV and duration of tens of nanoseconds were applied to the powered inner cylindrical electrode which resulted in the formation and propagation of a cathode-directed streamer. The resulting spatial and temporal production of active radical species such as O, H, and singlet delta oxygen is quantified and compared for lean and stoichiometric fuel-air mixtures. For the coaxial electrode geometry, the discharge is characterized by a primary streamer that bridges the inter-electrode gap and a secondary streamer that develops in the wake of the primary streamer. Most of the radicals are produced in the secondary streamer. For the corona geometry, only the primary streamer is observed and the radicals are produced throughout the length of the primary streamer column. The stoichiometry of the mixture was observed to have a relatively small effect on both the plasma discharge structure and the resulting yield of radical species.
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28 August 2013
Research Article|
August 23 2013
A numerical study of high-pressure non-equilibrium streamers for combustion ignition application
Douglas Breden;
Douglas Breden
1
Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin
, Austin, Texas 78712, USA
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Laxminarayan L. Raja;
Laxminarayan L. Raja
1
Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin
, Austin, Texas 78712, USA
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Cherian A. Idicheria;
Cherian A. Idicheria
2
General Motors Research and Development Center,
30500 Mound Road, Warren, Michigan 48090, USA
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Paul M. Najt;
Paul M. Najt
2
General Motors Research and Development Center,
30500 Mound Road, Warren, Michigan 48090, USA
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Shankar Mahadevan
Shankar Mahadevan
3
Esgee Technologies, Inc.,
1301, S. Capital of Texas Hwy., Suite B-122, Austin, Texas 78746, USA
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J. Appl. Phys. 114, 083302 (2013)
Article history
Received:
May 19 2013
Accepted:
July 29 2013
Citation
Douglas Breden, Laxminarayan L. Raja, Cherian A. Idicheria, Paul M. Najt, Shankar Mahadevan; A numerical study of high-pressure non-equilibrium streamers for combustion ignition application. J. Appl. Phys. 28 August 2013; 114 (8): 083302. https://doi.org/10.1063/1.4818319
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