Non-Reacting and Reacting Flow in a Swirl-Stabilized Burner for Ultra-Wet Combustion

The Impact of an Inhomogeneous Temperature Field on the Precessing Vortex Core in Swirling Jets Undergoing Vortex Breakdown

“…Therefore, the flow in a combustion chamber comprises of a cold jet and a hot wake. This setup is further motivated by the results of Terhaar et al 12 There, the PVC is suppressed, if the flame is anchored closely to the wave maker position of the isothermal case. The experiments in this study are designed to produce a significant heat release in the vicinity of the stagnation point (this is where the wave maker was located for the isothermal generic swirling jet), similar to the experiments of Terhaar et al Thereby, a negative radial temperature gradient is created by local heating of the flow.…”

“…Recent results in our group showed that the suppression of the PVC is dependent on the location of the flame. 12 Syred 11 summarizes the published results so far. He concludes that the occurrence of the PVC in reacting burner flows is not only dependent on vortex breakdown, but also on the burner geometry, the type of fuel injection and the equivalence ratio.…”

“…He concludes that the occurrence of the PVC in reacting burner flows is not only dependent on vortex breakdown, but also on the burner geometry, the type of fuel injection and the equivalence ratio. The crucial finding of Terhaar et al 12 is that the appearance or dampening of the PVC depends on the flame location and thereby on the location of the largest temperature gradient. It can be shown for their data that the wave maker remains at the same position for isothermal and reacting flow fields.…”

Residence Time Distribution in a Swirling Flow at Nonreacting, Reacting, and Steam-Diluted Conditions

“…Some differences can be observed for the investigated operating conditions and will be discussed briefly in the following. A more detailed description of the individual flow patterns and the related flame shapes is available in Terhaar et al [6].…”

“…The influence of steam on the combustor flow field and associated flame shapes was investigated in Terhaar et al [6]. At steam contents of around 30% of the air mass now, the flame showed an annular more distributed shape, whereas at dry conditions the flame featured a more compact v-shape.…”