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NIRE Annual Report
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 1999

Measurement of Thermal Radiation from Turbulent Flames in the Wavelength Region from 1.9 to 2.3 µm

Combustion Engineering Division
Thermal Energy and Combustion Engineering Department
Objectives
Combustion with pure O2 instead of with air would lead to saving fuel, especially for high-temperature furnaces, e.g. glass forming furnaces. Radiative heat transfer, dominant heat transfer mechanism in high-temperature furnaces, would change greatly when we replace conventional fuel/air burner with fuel/O2 burner.
In order to help shift from fuel/air burner to fuel/O2 burner, we investigate difference in radiative properties of turbulent flames of fuel/air and fuel/O2. Because radiative properties of turbulent flames are spectrally dependent and time dependent, we developed a time-resolved, multichannel spectroscopic system.
Results
Fig. 1 shows a schematic of the measurement system. InGaAs linear image sensor with low-noise, self-scanning preamplifier is mounted on a polychromator. Band of CO2(2.0mm) and of H2O(1.38, 1.87 mm) fall on spectral response range of the sensor(1.2 to 2.6mm). Minimum gate time of the system is 0.25msec, and minimum interval time is 27msec.
Fig.1. Schematic of measurement system
Fig.1. Schematic of measurement system
Fig. 2 shows spectral intensity of a CH4/air turbulent flame observed at a fixed position. Intensity profiles of 10 successive measurements are shown. Gas band emission and continuous emission are observed. Spectral intensity changes by each shot, which agree with time-dependent nature of the turbulent flame.
Fig. 2. Spectral intensity of a CH4/air turbulent flame
Fig. 2. Spectral intensity of a CH4/air turbulent flame

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