Flow, Turbulence and Combustion

, Volume 89, Issue 2, pp 275–294

Investigation of the Syngas Flame Characteristics at Elevated Pressures Using Optical and Laser Diagnostic Methods

  • Rajesh Sadanandan
  • Peter Kutne
  • Adam Steinberg
  • Wolfgang Meier
Article

DOI: 10.1007/s10494-011-9354-z

Cite this article as:
Sadanandan, R., Kutne, P., Steinberg, A. et al. Flow Turbulence Combust (2012) 89: 275. doi:10.1007/s10494-011-9354-z

Abstract

The effect of pressure on the characteristics of syngas flames is investigated under gas turbine relevant conditions using planar laser induced fluorescence of OH radicals and OH* chemiluminescence imaging. An optically accessible combustor fitted with a swirl burner was operated with two different syngas mixtures, preheated air at 700 K, and pressures ranging from 5 to 20 bars. The thermal load varied from 15 to 25 kW/bar at an equivalence ratios 0.5. The OH-PLIF measurements show that the flames under all conditions exhibited two reaction fronts, one at the shear layer between the inner recirculation zone and the fuel inlet, and one between the fuel inlet and the air nozzle. The more or less continuous reaction front at low pressure turned into a highly corrugated flame front at higher pressures, with isolated regions of ignition and extinction. The probability density distribution of the flame curvature for the mixtures studied showed that the inner and outer flame responded differently to the pressure increase, with the mean curvature magnitude also depending on the mixture composition and thermal load. The measurements clearly shows the limitations associated with the use of OH* chemiluminescence images as a marker for the heat release rate especially in case of syngas mixtures.

Keywords

Syngas fuelsGas turbine combustionLaser induced fluorescenceChemiluminescenceFlame curvatures

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Rajesh Sadanandan
    • 1
  • Peter Kutne
    • 1
  • Adam Steinberg
    • 1
  • Wolfgang Meier
    • 1
  1. 1.Institut für VerbrennungstechnikDLR StuttgartStuttgartGermany