Abstract
The starting vortex of an impulsively generated jet diffusion flame was studied experimentally. Fuel jets were produced by the sudden discharge via a solenoid valve into still air. The fuel jet was ignited by a pilot flame. The length and lateral spread of the flame were determined by video imaging. All flames were in the buoyancy-driven regime after the starting transient. The height at which the starting vortex burned off completely was approximately the same as the mean flame length of the subsequent steady flame. The penetration of the flame tip associated with the starting vortex can be correlated by a buoyancy parameter derived from the isothermal starting plume theory of Turner. An unexplained dependence of penetration on nozzle diameter was observed. The timescale for the mixing of the starting vortex at its maximum flame height appears to be about one-half of the vortex rotation time at the same location. These findings may be useful in understanding unsteady combustion phenomena, especially as they pertain to active combustion control schemes.
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