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RESEARCH PAPERS: Combustion and Reactive Flows

Study of Infrared CO2 Radiation From Liquid-Fueled Combustor

[+] Author and Article Information
Y. Levy, V. Ovcharenko

 Israel Institute of Technology, Faculty of Aerospace Engineering, Haifa, 32000, Israel

M. Lev

 Israel Institute of Technology, Faculty of Aerospace Engineering, Haifa, 32000, Israelaerysml@aerodyne.technion.ac.il

J. Heat Transfer 128(5), 478-483 (Nov 06, 2005) (6 pages) doi:10.1115/1.2175153 History: Received July 19, 2005; Revised November 06, 2005

The combustor that is a 30% flat (rectangular) model of an annular turbojet-engine combustion chamber was studied. It gave a turbulent nonpremixed kerosene-air flame with equivalence ratios within the range of 0.15–0.75. Measurements of CO2 infrared radiation were performed on exhaust gases from a combustor. The infrared radiation images were obtained by an IR camera equipped with a narrow bandpass filter that falls on the CO2 fundamental band. Temperature profiles were measured by the thermocouple at the combustor outlet. The in-house program INFRAD was used to calculate infrared radiation from the CO2 component of the efflux gases from the combustor. The calculation was performed, taking into account the effects of radiation emission and absorption along an optical path. The calculations that allow prediction of “apparent” gas temperatures are those expected to be read by the IR camera. The calculated results are compared with experimental measurements. They are found to be in close agreement.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Combustor (all units in mm)

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Figure 2

Measured temperature profiles along the Y-axis for different equivalence ratios, X=10mm, Z=0mm

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Figure 3

Measured temperature profiles along the X-axis for different equivalence ratios, Y=65mm, Z=0mm

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Figure 4

Comparison of experimental and calculated apparent blackbody temperature read by a PM390 camera with the 4.6μm filter

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Figure 5

Planar CO2 radiation images of exhaust gases obtained with a 4.6μm filter for two equivalence ratios

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Figure 6

Measured Teff, averaged over five images (4.6μm filter)

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Figure 7

Experimental and calculated temperature profile along the X-axis for different equivalence ratio, Z=0mm, 4.6μm filter

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Figure 8

Calculated CO2 radiance spectra for different equivalence ratios, X=0mm, Z=0mm

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Figure 9

Calculated radiation intensity at 4.6μm depending on the X-coordinate for different equivalence ratio, Z=0mm

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