Voltage-Current Characteristics of a Flame-Assisted Unipolar Corona

J. Vinogradov, E. Sher, I. Rutkevich , M. Mond

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The voltage-current characteristics (VCC) of flame-assisted electrical coronas have been measured in an inhomogeneous electric field. The electric field was created by applying a voltage less than 25 kV DC between a cylindrical metallic burner and a planar metallic grid, which was perpendicular to the axis of the burner. Both positive and negative polarities of the applied voltage were studied in the presence of a pre-mixed methane-air flame. The results were compared with the VCC measured for the same discharge gap in the absence of a flame. Simultaneously, with measuring a VCC the behavior of the flame was observed and its height was measured under a gradually increased voltage, which resulted in the flame shortening. For most cases complete extinction of the flame was achieved at a particular voltage. An exact spherically symmetric solution for a unipolar corona in the domain between two spherical electrodes, was used to model the discharge gap between the flame boundary and the grid and also to calculate the VCC for comparison with the experimental results. It is shown that in the presence of a flame, the experimental and theoretical VCCs can be matched if the radius of curvature of the flame tip increases with the total current. This agrees with the present experimental results, in which flattening of a flame was observed when the current was increased.
Original languageEnglish
Pages (from-to)2041-2050
Number of pages10
JournalCombustion and Flame
Volume127
Issue number1-2
DOIs
Publication statusPublished - 1 Oct 2001

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Current voltage characteristics
coronas
flames
Electric potential
electric potential
Fuel burners
Electric fields
Methane
burners
Electrodes
grids
Air
electric fields
flattening
polarity
extinction
methane
direct current
curvature
radii

ASJC Scopus subject areas

  • Energy(all)
  • Engineering(all)

Cite this

Voltage-Current Characteristics of a Flame-Assisted Unipolar Corona. / Vinogradov, J.; Sher, E.; Rutkevich , I.; Mond , M.

In: Combustion and Flame, Vol. 127, No. 1-2, 01.10.2001, p. 2041-2050.

Research output: Contribution to journalArticle

Vinogradov, J. ; Sher, E. ; Rutkevich , I. ; Mond , M. / Voltage-Current Characteristics of a Flame-Assisted Unipolar Corona. In: Combustion and Flame. 2001 ; Vol. 127, No. 1-2. pp. 2041-2050.
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