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Determination of Flame Temperatures from 2000 to 3000 K by Microwave AbsorptionEquations are derived for the measurement of flame temperatures from the attenuation of a microwave beam by temperature-induced free electrons from chemical elements introduced in the flame. Corrections are developed to account for the electron distribution in the flame. Procedure for obtaining the temperature from absorption is outlined. The free electron collision frequency and an effective ionization potential for four alkali elements were determined experimentally. The data were taken on a gas burner with a temperature range from 1900deg to 2400deg K. The effective ionization potential of sodium agrees with the spectral-line limit value. From these experimental ionization potentials and the experimental collision frequency, an accuracy of +/-600 K in the temperature was obtained. Fluctuating and average temperature data of a liquid propellant burner are presented primarily from 1.25-centimeter-wavelength microwave measurements in comparison with simultaneous two-color pyrometer and sound intensity measurements in the region from 2200deg to 2900deg K.
Document ID
19930083974
Acquisition Source
Legacy CDMS
Document Type
Other - NACA Technical Note
Authors
Kuhns, Perry W (National Advisory Committee for Aeronautics. Lewis Flight Propulsion Lab. Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1954
Subject Category
Propellants And Fuels
Report/Patent Number
NACA-TN-3254
Accession Number
93R13264
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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