Enhancement of Cold Plasma Reactions and Energy Deposition by Multi-Voltage Pulse Discharges

Nir Druker, Gideon Goldwine, J. Barry Greenberg, Eran Sher

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The use of cold plasma for ignition and combustion improvement in internal combustion engines has been widely investigated in the past two decades. Usually, high voltage nanosecond pulses are repeatedly applied to facilitate such a process. Compared to traditional ignition, nanosecond repetitive pulse ignition systems demonstrate improvement in heat release rate during combustion, ignition delay time reduction and enhanced ignition process in flowing and lean reactive gas mixtures. In this research, we conducted a preliminary, theoretical/numerical investigation into the possibility of use of on-board control of cold plasma processes, known to enhance ignition and combustion of reactive gas mixtures. The focus was on diagnostics and enhancement of energy deposition in specific modes, by application of bi-polar short duration voltage pulses in low-pressure air. The physical model couples the electric field, potential and current, with the relevant conservation equations for 24 species via 168 kinetic reactions, including molecules’ rotation, vibration, electronic excitation, dissociation, and ionization inside the electrodes gap. Evaluation using various pulse repetition frequencies and different pulse shapes was conducted. Special attention was given to the overall coupled energy deposited during the discharge, and to energy channeled to known ignition supportive modes such as nitrogen electronic excitation and oxygen radicals’ generation. The results of the analysis show that for the considered conditions, energy deposition can be divided into two main stages, characterized by high and low voltage magnitudes, respectively. It was found for the first time, that the (low voltage) second stage’s energy deposition can be higher than that of the first (high voltage) stage. At the second stage, the deposition of energy into specific modes can be tuned by setting appropriate voltage magnitudes. In addition, the energy deposited in modes important for ignition exhibits a simple linear relation to the overall energy deposition.

Original languageEnglish
Title of host publicationIACAS 2022 - 61st Israel Annual Conference on Aerospace Science
PublisherTechnion – Israel Institute of Technology
ISBN (Electronic)9781713862253
StatePublished - 1 Jan 2022
Externally publishedYes
Event61st Israel Annual Conference on Aerospace Science, IACAS 2022 - Haifa, Israel
Duration: 9 Mar 202210 Mar 2022

Publication series

NameIACAS 2022 - 61st Israel Annual Conference on Aerospace Science


Conference61st Israel Annual Conference on Aerospace Science, IACAS 2022

ASJC Scopus subject areas

  • Aerospace Engineering


Dive into the research topics of 'Enhancement of Cold Plasma Reactions and Energy Deposition by Multi-Voltage Pulse Discharges'. Together they form a unique fingerprint.

Cite this