Abstract
Abstract
Highlights
A premixed laminar flame propagating in a quiescent, gravity-free environment can develop intrinsic flamefront cellular instability, which renders the otherwise smooth flamefront wrinkled with a wide range of cell sizes
It has been suggested that a self-accelerating laminar flame could attain a ‘turbulence-like’ behaviour, a phenomenon termed self-turbulization, which in turn could become supersonic through a process termed deflagration-to-detonation transition, or DDT (Sivashinsky 1977; Oran & Gamezo 2007; Vasil’ev 2012; Clavin & Searby 2016), which has been analytically and numerically studied (Zeldovich & Rozlovskii 1947; Khokhlov, Oran & Wheeler 1997; Akkerman, Law & Bychkov 2011; Kagan & Sivashinsky 2017; Kiverin, Yakovenko & Fortov 2019)
In our previous study (Yang et al 2016), it was shown that the propagation of cellularly unstable expanding flames at various pressures can be unified when the normalized flame propagation speed is plotted with the normalized radius, or Péclet number, Pe = Rf /δL,0, somewhat similar to turbulent flames (Chaudhuri et al 2012)
Summary
A premixed laminar flame propagating in a quiescent, gravity-free environment can develop intrinsic flamefront cellular instability, which renders the otherwise smooth flamefront wrinkled with a wide range of cell sizes. Irrespective of the instability mode, once the cellular structure appears on the flamefront, the continuous generation and evolution of new cells will increase the flame surface area and the burning rate, a process known as self-acceleration. It has been suggested that a self-accelerating laminar flame could attain a ‘turbulence-like’ behaviour, a phenomenon termed self-turbulization, which in turn could become supersonic through a process termed deflagration-to-detonation transition, or DDT (Sivashinsky 1977; Oran & Gamezo 2007; Vasil’ev 2012; Clavin & Searby 2016), which has been analytically and numerically studied (Zeldovich & Rozlovskii 1947; Khokhlov, Oran & Wheeler 1997; Akkerman, Law & Bychkov 2011; Kagan & Sivashinsky 2017; Kiverin, Yakovenko & Fortov 2019). The issue of self-turbulization, within this proposed trilogy of events, that is, from self-acceleration, to self-turbulization to DDT, has not been adequately examined and is the subject of the present study
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