A parametric study of the radiant energy flux to the fuel surface during hybrid combustion
Bruntlett, Carl Eugene
Reichenbach, R. E.
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The heat transfer rate to the solid fuel surface during hybrid combustion has been considered as the primary rate limiting phenomenonin one theoretical analysis of the hybrid combustion process. One mode of heat transfer involved is the radiant energy flux to the fuel surface. Little data are available for direct measurement of this portion of the heat transfer. Experiments were conducted in which the radiant flux to the fuel surface was measured by utilizing thin-film thermometers as a heat sensing device. A limited amount of data was obtained for the radiant flux during combustion of the polystyrene-oxygen system. These data established a range of values for the radiant flux of 10-14 BTU/sq ft sec. Combustion chamber pressure was varied between 7 and 14 atmospheres. Values of oxidizer mass flux, 0.15 and 0.24 lbm/sq in sec, were used to obtain the data. The results appeared to verify the analytical formulation for fuel linear regression rate in terms of the physical coupling between the convective and radiative heat transfer rates to the fuel surface. (Author)
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