Quantification of low Damköhler number turbulent premixed flames

The reactivity of hydrogen enriched turbulent flames

“…The present opposed jet configuration was originally developed by Geyer et al [27] and has been used by Geipel et al [26], Goh et al [22,25] and Hampp and Lindstedt [24,29,30,32]. A schematic is provided in Fig.…”

“…The HCP composition, including the residual oxygen concentration, does not exert a strong impact on the self-sustained flames [28,30,31] of primary interest here.…”

“…The normal rate of strain conditioned on the instantaneous flame front is calculated using the methodology of Hampp and Lindstedt [29,30]. The instantaneous planar strain rate tensor (e ij = 0.5(∂u i /∂x j + ∂u j /∂x i )) is calculated from the PIV data.…”

“…Flame propagation in the BTB configuration can be influenced or governed by the counterflow hot combustion products for cases with insufficient flame detachment from the stagnation plane [30]. This can result in questionable S T values as the reaction progress may become influenced by autoignition events.…”

“…The back-toburnt (BTB) configuration further allows the stabilisation of flames at low Damköhler numbers and permits investigations of combustion regime transitions [24,28]. In particular, self-sustained flames detach from the stagnation plane and become independent of the opposing burnt gas [29], while low Da combustion is dominated by interactions between the two streams [30,31].…”