Propagation of Darrieus-Landau unstable laminar and turbulent expanding flames (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Propagation of Darrieus-Landau unstable laminar and turbulent expanding flames (PDF)
- 发表刊物：
- Proc Combust Inst
- 摘要：
- The propagation of laminar and turbulent expanding flames subjected to Darrieus-Landau (DL), hydrodynamic instability was experimentally studied by employing stoichiometric H2/O2/N2 flames under quiescent and turbulent conditions performed in a newly developed large-scale, fan-stirred combustion chamber. In quiescent environment, DL unstable laminar flame exhibits three-stage propagation, i.e. smooth expansion, transition acceleration, and self-similar acceleration. The self-similar acceleration is characterized by a power-law growth of acceleration exponent, , with normalized Peclet number, which is different from the usually suggested self-similar propagation with a constant . The imposed turbulence advances the onset of both transition acceleration and self-similar acceleration stages, and promotes the strength
of flame acceleration as additional wrinkles are invoked by turbulence eddies. A DL-turbulent interaction regime is confirmed to be the classical corrugated flamelets regime. Furthermore, the DL instability significantly facilitates the propagation of expanding flames in medium and even intense turbulence. The development of DL cells is not suppressed by turbulence eddies, and it has to be considered in turbulent combustion.
- 合写作者：
- Cai X, Wang JH, Bian ZJ, Zhao HR, Li ZS, Huang ZH
- 卷号：
- 2020
- 页面范围：
- in press
- 是否译文：
- 否
- 发表时间：
- 2021-04-10