Interaction of gaseous multiple swirling flames.

This thesis is based on a study of the behaviour of the
multiple burner systems. The influence of number of burners,
their separation and degree of swirl on the interaction of
multiple gaseous turbulent diffusion flames, for different configurations
chosen, has been investigated. A single flame has
been studied as a reference flame to provide information for the
comparison with multiple systems.
The temperature and concentration profiles within the flames
have been determined using thermocouples and a semi-continuous gas
sampling system in conjunction with a gas chromatograph.
Three orthoganol mean velocity components in the annular air
stream of a single isothermal swirling jet have been measured
using a hot wire anemometer and by the application of a four
point measurement technique developed within the department.
Multiple flame systems were found to be less stable against
blow-off compared to single flames and the blow-off limit shifted
towards the fuel rich region as the swirl was reduced. At low
swirl levels and minimum separation the centre flames were lifted
off the burner rim and were frequently blown-off.