Experimental Investigation of the Flame Front Propagation Characteristic During Light-round Ignition in an Annular Combustor
| Autor: | Chengbiao Ma, Yifan Xia, Changhong Linghu, Chenran Ye, Haiwen Ge, Yao Zheng, Gaofeng Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Convection
Materials science General Chemical Engineering Scheduling (production processes) General Physics and Astronomy 02 engineering and technology Injector Mechanics 01 natural sciences Thermal expansion 010305 fluids & plasmas law.invention Ignition system chemistry.chemical_compound 020303 mechanical engineering & transports 0203 mechanical engineering chemistry law Propane 0103 physical sciences Combustor Physical and Theoretical Chemistry Flame front |
| Zdroj: | Flow, Turbulence and Combustion. 103:247-269 |
| ISSN: | 1573-1987 1386-6184 |
| DOI: | 10.1007/s10494-019-00018-y |
| Popis: | The light-round process in a transparent annular combustor which comprises 16 swirling injectors injecting lean premixed propane/air mixtures is experimentally investigated. This annular combustor is derived from the ‘MICCA’ combustor, pioneered by EM2C laboratory (Bourgouin et al., Combust. Flame 160(8), 1398, 2013).The annular chamber is formed by two transparent concentric quartz tubes, which provides optical access to high-speed imaging to diagnose the chemiluminescence of flame fronts. Two ignition modes (i.e. two extreme conditions in scheduling fuel delivery and igniter sparking), controlled by ignition procedure are investigated, thus the FFSL (Fuel First, Spark Later) and the SFFL (Spark First, Fuel Later) modes. These two ignition modes exhibit different patterns of injector-to-injector flame propagation during the light-round process. The light-around time and mean circumferential flame propagation speed are obtained for various conditions. The influence of thermal expansion, velocity fluctuation and convection to the light-round process is investigated and compared for two ignition modes. |
| Databáze: | OpenAIRE |
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