Determination of the radiative of pulverized-coal particles. Technical progress report, third quarter of the third year, March 15, 1990--June 15, 1990
For accurate modeling of radiative transfer in combustion systems, radiative properties of combustion products are required. It is usually difficult to calculate the properties of nonhomogeneous and irregular-shaped pulverized-coal and char particles, because of the lack of information on optical constants and unavailability of simple and accurate theoretical models. Because of this, it is preferable to determine the required properties from experiments in situ. This can be accomplished by combining optical diagnostic techniques with inverse analyses of radiative transfer problem. In this study, experiments were conducted using a CO{sub 2}-laser nephelometer to measure angular distribution of light scattered by a cold-layer of pulverized-coal particles. The data obtained from the experiments were used along with a new step-phase function approximation in a numerical inverse radiation scheme to obtain ``effective`` extinction coefficient and scattering phase function for coal particles in narrow size distributions. In addition to that, a mercury-arc-lamp monochromator system was used to obtain spectral absorption coefficient of coal particles as a function of wavelength and coal size.
- Research Organization:
- Kentucky Univ., Lexington, KY (United States). Dept. of Mechanical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-87PC79916
- OSTI ID:
- 10169200
- Report Number(s):
- DOE/PC/79916--9; CONF-910318--16; ON: DE93016905
- Country of Publication:
- United States
- Language:
- English
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