Structure and Propagation of Turbulent Premixed Flames Stabilized in a Stagnation Flow

摘要

Turbulence statistics in premixed methane/air flames stabilized by a stagnation plate have been measured using the two-component laser Doppler velocimetry technique. Experimental conditions cover equivalence ratios of 0.67 to 1.16, incident turbulence intensities of 0.1 to 0.7 m/s, and global stretch rates of 100 to 230 sec. Results on turbulence statistics show that in crossing the flame the increase in fluctuation is more pronounced in the normal component while the Reynolds stress remains almost zero, and that the velocity joint probability density function is bimodal for rich flames and mono-modal for lean flames. Keywords: Reprints, Turbulent flame, Stagnation flame. (jes)