Energy coupling in repetitively pulsed nanosecond dielectric barrier discharges in plane-to-plane geometry

Sharath Nagaraja, Vigor Yang

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

1 Citation (Scopus)

Abstract

One-dimensional simulations are performed in air to study the dynamics of energy coupling, gas heating and generation of active species by repetitively pulsed nanosecond dielectric barrier discharges (NS DBD) in plane-to-plane geometry. The plasma is modeled using a two-temperature detailed chemistry model, with ions and neutral species in thermal equilibrium at the gas temperature, and electrons in thermal nonequilibrium. The input energy is directly proportional to number density, and remains fairly constant on a per molecule basis from pulse to pulse. At 40 kHz pulsing rate, nearly 75% of the input energy is coupled the vibrational energy mode as compared to 40% of the energy used in vibrational excitation at 1 kHz pulsing rate. As a consequence, we hypothesize that the compression waves generated through fast gas heating in surface nanosecond discharges will be weaker at higher pulsing frequencies because of reduced energy coupling at higher E/N range (above 200 Td). Repetitive pulsing results in uniform production of atomic oxygen in the discharge volume via electron impact dissociation during voltage pulses, and through quenching of excited nitrogen molecules in the afterglow. A uniform "hat shaped" temperature profile develops in the discharge volume after multiple pulses, owing to chemical heat release from quenching of excited species. This may explain recent observations of volumetric ignition of fuel-air mixtures subjected to nanosecond volume discharges.

Original languageEnglish
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
Publication statusPublished - 2013
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: 2013 Jan 72013 Jan 10

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
Country/TerritoryUnited States
CityGrapevine, TX
Period13-01-0713-01-10

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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