Investigating the effect of mixing carbon dioxide with CH4
has been in attention of many researchers. This is because alternative
fuels such as bio syngas have high concentrations of
carbon dioxide. However, biogas and bio syngas are produced
from various sources and as a result the amount of methane with
carbon dioxide varies depending on the production source. As a
consequence combustion characteristics of these fuels vary and
also tend to be less known with respect to that of natural gas.
To have a better design for non-fossil fuel combustion system,
a wider examination is required to understand the effect on the
combustion properties by mixing carbon dioxide with methane.
Image processing is utilised in this study to investigate the flame
properties by digitally analysing the flame chemiluminescence
emission. The images are captured by a high speed colour camera,
which is able to record and monitor the spatial and temporal
changes in flame chemiluminescence when adding different
amounts of carbon dioxide to methane from the moment of ignition
to any specific time during combustion. Results confirmed
that by increasing carbon dioxide level, the flame temperature
and soot level are reduced and the flame height is getting longer.
On the other hand it has been qualitatively observed that the ignition
time is increased. Also, the presence of soot that only emits
infrared light is observed during the ignition period. Through
digital image processing more quantitative analysis are carried
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.