Fine wire thermocouple measurements of fluctuating temperature

Journal Article · Fri Dec 31 23:00:00 EST 1976 · Combust. Sci. Technol.; (United States)

DOI:https://doi.org/10.1080/00102209708946813· OSTI ID:5324261

Ballantyne, A; Moss, J B

A technique for the measurement of the statistics of the temperature fluctuation, notably probability density function and power spectrum, in turbulent diffusion flames which employs fine wire thermocouples, compensated for the effects of thermal inertia, is assessed. Measurements made in an open turbulent methane diffusion flame are reported and compared, from the standpoint of identifying the interaction between measurement technique and turbulent flame structure, with simple model predictions. The flame-intermittent zone is seen to be characterised by large fluctuations in temperature and velocity which lead to significant local variations in heat transfer to the thermocouple and hence in its time constant. Attention is therefore focussed on an assessment of the impact on measured temperature statistics of both the level of compensation and the manner it is effected. Techniques involving electrical networks and computational procedures are discussed.

• Research Organization: Southampton Univ., Eng.
• OSTI ID: 5324261
• Journal Information: Combust. Sci. Technol.; (United States), Journal Name: Combust. Sci. Technol.; (United States) Vol. 17:1/2; ISSN CBSTB
• Country of Publication: United States
• Language: English

Related Subjects

090110* -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Pyrolysis
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ALKANES
COMBUSTION HEAT
CRYOGENIC FLUIDS
ENERGY
ENTHALPY
FLAMES
FLUIDS
HEAT
HYDROCARBONS
MEASURING INSTRUMENTS
METHANE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
REACTION HEAT
TEMPERATURE GRADIENTS
TEMPERATURE MEASUREMENT
THERMOCOUPLES
THERMODYNAMIC PROPERTIES
TURBULENCE