Figure 2: CFD model results of the flame lens at four axial positions.

(a) False colour plot of the CFD calculated density at the two ends of the lens and at two central regions. The same is shown for (b) temperature and (c) gas velocity. Near the centre of the lens the cross-sectional profiles have approximate radial symmetry. The flame lens structure is shown in grey together with the injection nozzle of the flame (grey rod).