Mitigation of Darrieus–Landau instability effects on turbulent premixed flames

Abstract Theoretical considerations on the competition between most amplified modes for Darrieus–Landau (DL) hydrodynamic instability and turbulence timescales, show that, two extremal regimes can be identified: instability-dominated turbulence-dominated regimes. In latter, also denoted as unified regime, both experiments numerical simulations give evidence showing how large scale, cusp-like structures of flame front surface, typical DL instability, are hindered by turbulent fluctuations. The result is that quantities such propagation curvature statistics, which in dominated regime enhanced or modified overwhelming presence now mitigated a reached characteristics unstable stable configurations become indistinguishable. this work we analyze concealing effects increasing level over although some global indices skewness p.d.f. suggest reached, others persistence residual differences: particular, power spectral density curvature. We use experimental datasets (based linear stability analysis) flames, conditions ranging from quasi laminar to significantly