skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Modeling of the effects of non-equilibrium excitation and electrode geometry on H2/air ignition in a nanosecond plasma discharge

Journal Article · · Combustion and Flame

In this work, we present the results of two-dimensional modeling of the effects of non-equilibrium excitation and electrode geometry on H2/air ignition in a nanosecond plasma discharge. A multiscale adaptive reduced chemistry solver for plasma assisted combustion (MARCS-PAC) based on PASSKEy discharge modeling package and compressible multi-component reactive flow solver ASURF+ is developed and validated. This model is applied to simulate the impact of non-equilibrium plasma excitation and electrode geometry and heat loss on the dynamics of the discharge from streamer to spark and ignition kernel development in a H2/air mixture with a pair of cylindrical electrodes. The results show that the plasmagenerated species (N2(A), N2(B), N2(a'), N2(C), O(1D), O and H) in the spark and afterglow significantly accelerate the ignition kernel development. The increase of discharge voltage at the same total discharge energy promotes the non-equilibrium active species production. It is found that the production of electronically excited species at higher reduced electric field strength is more efficient in enhancing ignition in comparison to the vibrational excitation and heating. Moreover, the 2D simulation clearly reveals that the electric field and active species distribution are highly non-uniform. The streamers are initiated at the sharp outer edges of the negative and positive electrodes by a strong electric field while the electric field is much weaker at the centerline of the electrodes. Furthermore, the simulations reveal that the ignition enhancement is sensitive to the variation of electrode shape, diameter, and gap size due to the changes of electric field distribution and location of streamer formation. A cylindrical electrode produces a larger discharge volume and ignition kernel than the parabolic and spherical electrodes, when the discharge is localized near the axis of the gap. It is found that there is a non-monotonic dependence of ignition kernel size on the electrode diameter and inter-electrode distance. The increase of electrode diameter and gap size above the optimal conditions leads to the reduction of ignition kernel volume, due to the decrease of active species concentration and gas temperature. At a larger electrode surface area and electrode diameter as well as smaller electrode gap size, the heat loss to electrode plays a greater role in reducing the ignition kernel size and slowing ignition kernel development. This work provides insights and guidance to understand the kinetic enhancement of non-equilibrium plasma and the effects of electrode geometries on ignition for the optimization ignitors in advanced engines.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF)
Grant/Contract Number:
SC0020233; CBET-1903362; CBET-2029425
OSTI ID:
1906160
Journal Information:
Combustion and Flame, Vol. 240; ISSN 0010-2180
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (72)

Dual-pulse laser ignition model journal October 2018
Plasma-assisted ignition and deflagration-to-detonation transition
  • Starikovskiy, Andrey; Aleksandrov, Nickolay; Rakitin, Aleksandr
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 370, Issue 1960 https://doi.org/10.1098/rsta.2011.0344
journal February 2012
Effects of controlled non-equilibrium excitation on H2/O2/He ignition using a hybrid repetitive nanosecond and DC discharge journal August 2019
Nanosecond surface dielectric barrier discharge in atmospheric pressure air: I. measurements and 2D modeling of morphology, propagation and hydrodynamic perturbations journal November 2017
Schlieren imaging and pulsed detonation engine testing of ignition by a nanosecond repetitively pulsed discharge journal June 2015
Modeling of fast ionization waves in pure nitrogen at moderate pressure journal June 2021
Nanosecond-Pulsed Discharges for Plasma-Assisted Combustion and Aerodynamics journal November 2008
Photoionization in negative streamers: Fast computations and two propagation modes journal February 2007
Mechanism of ultra-fast heating in a non-equilibrium weakly ionized air discharge plasma in high electric fields journal June 2010
Solving the Boltzmann equation to obtain electron transport coefficients and rate coefficients for fluid models journal October 2005
A 3-D DNS and experimental study of the effect of the recirculating flow pattern inside a reactive kernel produced by nanosecond plasma discharges in a methane-air mixture journal January 2017
Investigation of the mechanism for rapid heating of nitrogen and air in gas discharges journal October 2001
Simulation of the hydrodynamic expansion following a nanosecond pulsed spark discharge in air at atmospheric pressure journal August 2013
Methane pyrolysis with N2/Ar/He diluents in a repetitively-pulsed nanosecond discharge: Kinetics development for plasma assisted combustion and fuel reforming journal November 2019
Time-resolved in situ measurements and predictions of plasma-assisted methane reforming in a nanosecond-pulsed discharge journal January 2021
Plasma-assisted stabilization of premixed swirl flames by gliding arc discharges journal January 2021
Nanosecond pulsed discharge in a propane–air mixture: Ignition and energy deposition journal January 2017
Effects of Lewis number and ignition energy on the determination of laminar flame speed using propagating spherical flames journal January 2009
Efficient models for photoionization produced by non-thermal gas discharges in air based on radiative transfer and the Helmholtz equations journal August 2007
Kinetic studies of ozone assisted low temperature oxidation of dimethyl ether in a flow reactor using molecular-beam mass spectrometry journal November 2016
Optimization of flame kernel ignition and evolution induced by modulated nanosecond-pulsed high-frequency discharge journal January 2021
Fully coupled modeling of nanosecond pulsed plasma assisted combustion ignition journal December 2018
The LXCat project: Electron scattering cross sections and swarm parameters for low temperature plasma modeling journal April 2012
CGS, A Fast Lanczos-Type Solver for Nonsymmetric Linear systems journal January 1989
Numerical investigations of nanosecond surface streamers at elevated pressure journal March 2021
Influence of fast-heating processes and O atom production by a nanosecond spark discharge on the ignition of a lean –air premixed flame journal May 2014
Upstream Nonoscillatory Advection Schemes journal December 2008
Gas heating in fast pulsed discharges in N 2 –O 2 mixtures journal January 2009
Role of electronegative gas admixtures in streamer start, propagation and branching phenomena journal August 2005
Plasma assisted combustion: Dynamics and chemistry journal June 2015
Modelling the impact of non-equilibrium discharges on reactive mixtures for simulations of plasma-assisted ignition in turbulent flows journal April 2016
Thermal-chemical instability of weakly ionized plasma in a reactive flow journal September 2019
Ignition of hydrogen–air mixtures using pulsed nanosecond dielectric barrier plasma discharges in plane-to-plane geometry journal April 2014
Oxidation of saturated hydrocarbons under the effect of nanosecond pulsed space discharge journal July 2006
An exploration of inter-pulse coupling in nanosecond pulsed high frequency discharge ignition journal June 2017
Studies of low temperature oxidation of n-pentane with nitric oxide addition in a jet stirred reactor journal November 2018
Exploring chemical kinetics of plasma assisted oxidation of dimethyl ether (DME) journal March 2021
Kinetic study of plasma-assisted n-dodecane/O2/N2 pyrolysis and oxidation in a nanosecond-pulsed discharge journal January 2021
Study of nanosecond discharges in H2–air mixtures at atmospheric pressure for plasma assisted combustion applications journal June 2017
Numerical investigations of turbulent premixed flame ignition by a series of Nanosecond Repetitively Pulsed discharges journal January 2021
Improvement of lean blow out performance of spray and premixed swirled flames using nanosecond repetitively pulsed discharges journal January 2021
Quantitative behavior of vibrational excitation in AC plasma assisted dry reforming of methane journal July 2020
Plasma-assisted ignition and combustion: nanosecond discharges and development of kinetic mechanisms journal August 2014
Dynamics and chemical mode analysis of plasma thermal-chemical instability journal March 2021
Plasma assisted ammonia combustion: Simultaneous NOx reduction and flame enhancement journal June 2021
Simulation of ionization-wave discharges: a direct comparison between the fluid model and E-FISH measurements journal July 2021
Reduction of flame development time in nanosecond pulsed high frequency discharge ignition of flowing mixtures journal July 2018
Ignition of Propane–Air Mixtures by a Repetitively Pulsed Nanosecond Discharge journal January 2006
Effects of low-temperature chemistry and turbulent transport on knocking formation for stratified dimethyl ether/air mixtures journal February 2019
Streamer breakdown: cathode spot formation, Trichel pulses and cathode-sheath instabilities journal January 2020
Plasma-assisted ignition and combustion journal February 2013
Two‐dimensional hybrid model of inductively coupled plasma sources for etching journal August 1993
Fast gas heating in a nitrogen–oxygen discharge plasma: I. Kinetic mechanism journal June 2011
Plasma supported combustion journal January 2005
Experimental and Modeling Study of C1–C3 Hydrocarbon Ignition in the Presence of Nitric Oxide
  • Gokulakrishnan, Ponnuthurai; Fuller, Casey C.; Klassen, Michael S.
  • Journal of Engineering for Gas Turbines and Power, Vol. 140, Issue 4 https://doi.org/10.1115/1.4038079
journal November 2017
Solving unsymmetric sparse systems of linear equations with PARDISO journal April 2004
An asymptotic preserving scheme for the streamer simulation journal June 2013
Chemkin-II: A Fortran chemical kinetics package for the analysis of gas-phase chemical kinetics report September 1989
Numerical modeling of ignition enhancement of CH4/O2/He mixtures using a hybrid repetitive nanosecond and DC discharge journal January 2019
Species and temperature measurements of methane oxidation in a nanosecond repetitively pulsed discharge
  • Lefkowitz, Joseph K.; Guo, Peng; Rousso, Aric
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 373, Issue 2048 https://doi.org/10.1098/rsta.2014.0333
journal August 2015
RKC time-stepping for advection–diffusion–reaction problems journal November 2004
Fast gas heating in N 2 /O 2 mixtures under nanosecond surface dielectric barrier discharge: the effects of gas pressure and composition
  • Nudnova, M. M.; Kindysheva, S. V.; Aleksandrov, N. L.
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 373, Issue 2048 https://doi.org/10.1098/rsta.2014.0330
journal August 2015
Hydrogen oxidation in a stoichiometric hydrogen-air mixture in the fast ionization wave journal March 2001
Time and space resolved diagnostics for plasma thermal-chemical instability of fuel oxidation in nanosecond plasma discharges journal October 2020
A multi-timescale and correlated dynamic adaptive chemistry and transport (CO-DACT) method for computationally efficient modeling of jet fuel combustion with detailed chemistry and transport journal October 2017
Plasma Assisted Low Temperature Combustion journal October 2015
Multiscale modeling and general theory of non-equilibrium plasma-assisted ignition and combustion journal September 2017
Studies of multi-channel spark ignition of lean n-pentane/air mixtures in a spherical chamber journal February 2020
Efficient Implementation of Weighted ENO Schemes journal June 1996
Study of the oxidation of alkanes in their mixtures with oxygen and air under the action of a pulsed volume nanosecond discharge journal December 2004
Modeling of streamer-to-spark transitions in the first pulse and the post discharge stage journal September 2020
A dynamic multi-timescale method for combustion modeling with detailed and reduced chemical kinetic mechanisms journal June 2010