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June 7, 2000 Radiation Model for CO2 and H20:

The original curve fit for the Planck mean absorption coefficient for CO2, under Radiation Model, fit. The problem apparently was that the coefficients for the original fit were reported with 5-digit precision, which was not sufficient to reproduce the fit. The consequence was a 20-25% overprediction of aP,CO2 relative to RADCAL values. The effect is not so large as to alter any qualitative conclusions regarding the comparison of previous calculations and measured results for temperature or NO. Laminar flame calculations by J-Y Chen show only a few percent difference in NO results using the old and new fit for CO2. This suggests that errors in turbulent flame calculations attributable to the old fit would be small compared to uncertainties in the measurements and in the chemical mechanisms. Therefore, we would not expect this error to significantly influence any quantitative conclusions either. The original fit for H2O, which was reported in the same form, had a lesser problem (few percent at 2500K), and new fit is also available for aP,H2O. Thanks to Qing Tang (Cornell) for pointing out the problem with the original curve fits and for double checking the new curve fits.


April 28, 2000 Flame D Velocity Profile Scaling:

Documentation file for piloted flame D was updated to correct an error in the x/d scaling of the tabulated axial velocity profile. Original documentation file had x-distance scaled by 7.72 mm rather than the correct nozzle diameter of 7.2 mm. E-mail notification was sent out in March 1999.

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