Errors induced by catalytic effects in premixed flame temperature measurements

Author

Pita, G.P.A. ; Nina, M.N.R.

Author_Institution

Dept. of Mech Eng., Inst. Superior Tecnico, Lisbon, Portugal

fYear

1989

fDate

18-21 Sep 1989

Firstpage

179

Lastpage

185

Abstract

The evaluation of instantaneous temperature in a premixed flame using fine-wire Pt/Pt-13%Rh thermocouples was found to be subject to significant errors due to catalytic effects. An experimental study was undertaken to assess the influence of local fuel/air ratio, thermocouple wire diameter, and gas velocity on the thermocouple reading errors induced by the catalytic surface reactions. Measurements made with both coated and uncoated thermocouples showed that the catalytic effect imposes severe limitations on accuracy of mean and fluctuating gas temperature in the radical-rich flame zone

Keywords

catalysis; flames; measurement errors; platinum; platinum alloys; temperature measurement; thermocouples; Pt-PtRh; catalytic effects; coated thermocouples; fuel/air ratio; gas velocity; premixed flame; premixed flame temperature measurements; radical-rich flame zone; thermocouple wire diameter; turbulent flames; uncoated thermocouples; Combustion; Equations; Fires; Fuels; Heat transfer; Hydrogen; Mechanical variables measurement; Temperature measurement; Velocity measurement; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation in Aerospace Simulation Facilities, 1989. ICIASF '89 Record., International Congress on

Conference_Location

Gottingen

Type

conf

DOI

10.1109/ICIASF.1989.77671

Filename

77671