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Electron Temperature Measurement in a Premixed Flat Flame Using the Double Probe Method
Author(s) -
Wild J.,
Kudrna P.,
Tichý M.,
Nevrlý V.,
Střižík M.,
Bitala P.,
Filipi B.,
Zelinger Z.
Publication year - 2012
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201200005
Subject(s) - thermocouple , electron temperature , combustor , materials science , calibration , analytical chemistry (journal) , electron density , electron , premixed flame , atmospheric pressure , atomic physics , plasma , physics , combustion , chemistry , meteorology , composite material , nuclear physics , quantum mechanics , chromatography
The electron temperatures T e were measured using a double probe in a premixed methane flame produced by a calibration burner according to Hartung et al. The experiment was performed at atmospheric pressure. In contrast to other authors, we have managed to find typical nonlinearities corresponding to the retarding electron current region and to calculate electron temperatures using a suitable fit on the basis of the measured characteristics. A Pt‐Rh thermocouple was used to measure temperatures T h corresponding to “heavy” species. Our results indicate that the flame plasma can be considered to be weakly non‐isothermic — T e = (2400–4000) K, T h = (1400–1600) K. On the basis of measurement of the saturated ion current, the number density of the charged particles was estimated at (0.3–3.8) · 10 17 m ‐3 . The trends in T e and T h in dependence on the positions of the probes and thermocouple in the flame differ substantially; this fact has not yet been explained (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)