副室式燃焼器内の燃焼機構 : 燃焼形態の定量的分類

概要

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Effects of the volume ratio, nozzle diameter, and the surface to volume ratio of the nozzle (S/V-value) on the initial jet velocity and ignition induction period are experimentally investigated in order to obtain a clear picture of the interrelation between the jet region in the main chamber at the very ignition and the combustion pattern. a reduction of the S/V-value under a constant nozzle diameter increases the initial jet velocity, leaving the ignition induction period almost unvaried. The higher the jet velocity and the longer the induction period, the greater the jet region and the lower the mean temperature within the region, resulting in an extremely rapid combustion in the main chamber. The combustion pattern parameter, derived from the dimensional analysis and defined by X=u_jτ_i/d, is found to be a simple measure to classify quantitatively the ignition and combustion processes in the main chamber independently of the volume ratio, nozzle diameter, and the S/V-value.
1986-10-25