Abstract
The effect of temperature variation on the behavior of a non-premixed oxy-methane flame was investigated with a lab-scale slot burner at atmospheric pressure (P∞=1.01325bar). The characteristics of flame behavior were simulated to analyze the flame structure and were observed by measuring the chemiluminescence from OH and CH radicals with a spectrometer and an intensified charge-coupled device (ICCD) camera. Flammable area was estimated by varying the flow velocity from mF=0.02–0.16g/s (i.e., uF=7–50m/s) for methane gas and mOx=0.24–2.71g/s (i.e., uOx=18–117m/s) for oxygen gas. The oxygen temperature at the nozzle exit (TOx) was changed from TOx=300 to 700K. Experimental measurements showed that the flammable area broadened as the oxygen temperature increased. The increase in oxygen temperature was associated with a decrease in the flame length. The concept of effective diameter was used to derive an empirical formula for flame length for use in a combustor design.
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