An improved thermocouple technique for measurement of fluctuating temperatures in flames

Journal Article · Thu Jan 01 04:00:00 EST 1987 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(87)90011-3· OSTI ID:6946807

Katsuki, M; Mizutani, Y; Matsumoto, Y

When we use an electrically compensated thermocouple for its frequency response to measure temperatures in turbulent flames, considerable errors occur due to the temperature- and velocity-dependencies of time constant of response, as well as surface reactions and radiative heat losses. An improved method of reproducing the patterns of temperature fluctuation was developed, in which a thermocouple was coated to be free from the effects of surface reactions and its unlinearized output was subjected to the thermal inertia compensation; then the compensated signals were converted into temperatures following the modified EMF characteristics of the thermocouple. The accuracy was examined in both a laminar diffusion flame and a turbulent premixed flame.

• Research Organization: Dept. of Mechanical Engineering, Combustion Lab., Osaka Univ., 2-1 Yamada-oka, Suita, Osaka
• OSTI ID: 6946807
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 67:1; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ACCURACY
DEPOSITION
ELECTROMOTIVE FORCE
ENERGY LOSSES
ERRORS
FLAMES
FLUCTUATIONS
FLUID FLOW
FREQUENCY DEPENDENCE
HEAT LOSSES
LAMINAR FLOW
LOSSES
MEASURING INSTRUMENTS
SIGNALS
SURFACE COATING
TEMPERATURE MEASUREMENT
THERMOCOUPLES
TIME DEPENDENCE
TURBULENT FLOW
VARIATIONS
VELOCITY