Investigation of cellular instabilities and local extinction for two-phase flames under microgravity conditions

被引：1

作者：

Eyice, Deniz Kaya ^{[1
,2
,3
]}

Halter, Fabien ^{[1
,2
]}

Yozgatligil, Ahmet ^{[3
]}

Gokalp, Iskender ^{[1
,3
]}

Chauveau, Christian ^{[1
]}

机构：

[1] Inst Combust Aerotherm Reactivite & Environm, CNRS INSTS, F-45071 Orleans, France

[2] Univ Orleans, F-45100 Orleans, France

[3] Middle East Tech Univ, Dept Mech Engn, TR-06800 Ankara, Turkiye

来源：

COMPTES RENDUS MECANIQUE | 2023年 / 351卷

关键词：

Two-phase combustion; cellular instabilities; local extinction; droplet-flame interaction; flame morphology; laminar flames; BURNING RATES; PROPAGATION; EVAPORATION; COMBUSTION; MIXTURES;

D O I：

10.5802/crmeca.174

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The initial mechanism of cellular instabilities on the flame surface was investigated experimentally. Firstly, mono-dispersed ethanol droplets were created via the Wilson cloud principle in a spherical combustion chamber, and aerosol ethanol/air flame propagation was tracked under microgravity conditions. Schlieren images revealed that at the beginning of the cellular structure formation, dark spots formed linking to the signal loss in a density gradient. This phenomenon is assumed to be local extinction and quenching on the flame front due to either liquid droplets' presence or evaporation. To further investigate the observed phenomenon, stagnation flame experiments were performed for rich propane/air gaseous flames with isolated ethanol droplet injection. The evidence for the local extinction on the flame surface due to droplet passage was found via the Chemiluminescence method. The intrinsic instabilities were found to be triggered by the droplets in cases where the flame cannot recover its initial state.

引用

页码：41 / 56

页数：16

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