AN EXPERIMENTAL AND COMPUTATIONAL STUDY OF SWIRLING HYDROGEN JET DIFFUSION FLAMES

Computations using the joint velocity-scalar probability density funct ion (pdf) method as well as benchmark quality experimental data for sw irling and nonswirling hydrogen jet diffusion flames are reported. Pre vious studies of diffusion flames reported in the literature have been limited to nonswirling flames and have had no detailed velocity data reported in the developing (near-nozzle) region of the flames. The mea surements and computations reported herein include velocities (mean an d higher moments up to fourth order) and temperature (mean and varianc e) near the burner exit and downstream locations lip to 26.5 jet diame ters. The velocities were measured with a three-component laser-Dopple r velocimeter (LDV) and the temperature was measured using coherent an ti-Stokes Raman spectroscopy (CARS). The joint pelf method offers sign ificant advantages over conventional methods for computing turbulent r eacting flow and the computed results are in good agreement with data. This study serves to present data that can be used far model validati on as well as to validate further the joint pdf method.