Experimental Analysis of Soot Formation and Oxidation in a Gas Turbine Model Combustor Using Laser Diagnostics

TitleExperimental Analysis of Soot Formation and Oxidation in a Gas Turbine Model Combustor Using Laser Diagnostics
Publication TypeJournal Article
Year of Publication2011
AuthorsGeigle, KP, Zerbs, J, Köhler, M, Stöhr, M, Meier, W
Journal TitleJournal of Engineering for Gas Turbines and Power
Volume133
Issue12
Pages121503
Abstract

Sooting ethylene/air flames were investigated experimentally in a dual swirl gas turbinemodel combustor with good optical access at atmospheric pressure. The goals of theinvestigations were a detailed characterization of the soot formation and oxidation processesunder gas turbine relevant conditions and the establishment of a data base for thevalidation of numerical combustion simulations. The flow field was measured by stereoscopicparticle image velocimetry, the soot volume fractions by laser-induced incandescence,the heat release by OH chemiluminescence imaging and the temperatures bycoherent anti-Stokes Raman scattering. Two flames are compared: a fuel-rich partiallypremixed flame with moderate soot concentrations and a second one with the same parametersbut additional injection of secondary air. Instantaneous as well as average distributionsof the measured quantities are presented and discussed. The measured sootdistributions exhibit a high temporal and spatial dynamic. This behavior correlates withbroad temperature probability density functions. With injection of secondary air downstreamof the flame zone the distributions change drastically. The data set, includingPDFs of soot concentration, temperature and flow velocity, is unique in combining differentlaser diagnostics with a combustor exhibiting a more challenging geometry thanexisting validation experiments.

URLhttp://dx.doi.org/10.1115/1.4004154
DOI10.1115/1.4004154