Comparison of Experimental and Computational Values of Flame Radiation

Procedures for making bandpass-filtered total radiometer measurements are described, and comparisons of the readings are made with soot and gas-band models of a spray-atomized flame. Three flames with different soot contents were examined. Liquid fuels used were an iso-octane-tetralin mixture, a Suntech-3 aircraft fuel blend, and petroleum JP-4. These were sprayed by a Parker-Hannifin twin-fluid 60-deg hollow-cone nozzle into swirling combustion air and dilution air flowing in an 80-mm-diam duct at atmospheric pressure. Bandpassfiltered radiometric observations at an axial location of x/R = 4.75 are reported. The readings are compared to predictions made using the exponential wideband model for gas radiation with added provision for the presence of soot at its own temperature. The comparisons show that the discrepancy between the experimental readings and the model predictions is within 3%. A B c D h I k K L n n q r R t T U x X