Title :
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
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;
Conference_Titel :
Instrumentation in Aerospace Simulation Facilities, 1989. ICIASF '89 Record., International Congress on
Conference_Location :
Gottingen
DOI :
10.1109/ICIASF.1989.77671
