Research Papers: Radiative Heat Transfer

Radiation Properties of Oxygen-Enhanced Normal and Inverse Diffusion Flames

[+] Author and Article Information
S. S. Krishnan

Department of Mechanical Engineering,  Indiana University-Purdue University Indianapolis, IN 46202

M. K. Saini, J. P. Gore

School of Mechanical Engineering,  Purdue University, West Lafayette, IN 47907

Y. Zheng1

Department of Mechanical Engineering,  University of Wyoming, Laramie, WY 82071yzheng1@uwyo.edu


Corresponding author.

J. Heat Transfer 134(2), 022701 (Dec 09, 2011) (8 pages) doi:10.1115/1.4005076 History: Received May 20, 2009; Revised August 22, 2011; Published December 09, 2011; Online December 09, 2011

Radiative heat transfer in oxygen-enhanced inverse flame configurations is an important area of study for fundamental combustion research and for terrestrial and spacecraft fire safety. Motivated by this, heat flux distributions, total radiative heat loss and spectral radiation intensities were investigated experimentally for oxygen-enhanced normal and inverse laminar ethane diffusion flames with increasing heat release rates. The oxygen mole fraction in the oxidizer was varied as 21%, 30%, 50%, and 100% with coflowing normal and inverse flame burners used to stabilize the flames. The inverse diffusion flames were essentially nonluminous while the normal diffusion flames with identical heat release rates were highly luminous. Oxygen enhancement led to reduced flame lengths, increased luminosities and increased total radiative heat loss and spectral radiation intensities for both normal and inverse diffusion flames. Using flame length as the characteristic length parameter, the normalized radiative heat flux distributions for flames approximately collapsed together, further establishing the effectiveness of the single point radiant output measurement technique. Radiative heat loss fractions of normal and inverse diffusion flames with varying oxygen concentrations in the oxidizer are compared. The radiation spectra of all flames included significant contributions from gas radiation from carbon dioxide and water vapor and the radiation spectra of the high oxygen concentration flames included contributions from soot radiation.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 2

Normalized radiative heat flux distributions of IDFs with varying oxygen mole fractions in oxidizer

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Figure 3

Radiative heat loss fraction as a function of heat release rate for NDFs and IDFs

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Figure 4

Spectral radiative intensities of flame NDF21A

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Figure 5

Spectral radiative intensities of flame NDF100A

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Figure 6

Spectral radiative intensities of flame IDF21A

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Figure 7

Spectral radiative intensities of flame IDF100B

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Figure 1

Normalized radiative heat flux distributions of NDFs with varying oxygen mole fractions in oxidizer



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