Investigation on wall and gas temperatures inside a swirled oxy-fuel combustion chamber using thermographic phosphors, O2 rotational and vibrational CARS

Wall and gas phase temperatures inside a swirled oxy-fuel combustion chamber are important to characterize the combustion process. Wall temperatures were measured by thermographic phosphors and discussed in combination with gas phase temperatures. For gas phase temperatures an O-2 vibrational coherent anti-Stokes Raman scattering (CARS) approach was compared to a N-2/O-2 rotational CARS (RCARS) system. The vibrational CARS (VCARS) setup was favorable due to higher signal strength at high temperatures. With this system gas phase temperature profiles inside a swirled oxy-fuel combustion chamber were measured and discussed for different operation conditions. The location of intermittent reaction zones could be determined. In order to provide a measurement tool for gas-assisted pulverized solid fuel flames the developed O-2-VCARS system was successfully tested in such a harsh environment. Possible error sources related to particles within the probe volume are discussed.

Automated summary

This study focused on the wall and gas phase temperatures inside a swirled oxy-fuel combustion chamber, comparing different methods such as vibrational CARS and rotational CARS for gas phase temperature measurements. The developed O-2-VCARS system was successfully tested in a harsh environment to provide a measurement tool for gas-assisted pulverized solid fuel flames, with discussions on possible error sources related to particles within the probe volume.