Abstract
A time-varying, axi-symmetric, methane/air, nonpremixed flame is created by imposing a sinusoidal modulation to the fuel flow rate, which creates flames that “pinch off” and then detach from the burner. Carbon monoxide concentrations and temperatures are measured using tunable diode laser absorption spectroscopy (TDLAS) and are compared with those observed in a nonperturbed flame. The measurements indicate that at most phases of the oscillation, the time-varying flame is both broader and taller than the steady flame. Just before the flame detaches, high levels of CO are observed at the flame tip in regions of the flame that have high soot loading. In the detached flames, relatively high levels of CO remain and the time-averaged emission index for CO is larger in the oscillating flame.
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