Effect of air-assistant on ignition and flame-holding characteristics in a cavity-strut based combustor

Junjie Miao, Yuxin Fan, Weiqiu Wu and Shilong Zhao

Applied Energy, 2021, vol. 283, issue C, No S0306261920316925

Abstract: For promoting the expansion of pilot flame in high-subsonic flows, radial flame-holders are commonly introduced to combine with the pilot flame-holder, which may inversely bring about issues to the pilot ignition and flame stability. To simultaneously obtain satisfactory ignition and flame-propagation performance, a novel air-assistant design is proposed for the cavity-strut based combustor. Furthermore, comparison experiments are conducted under ambient pressure to investigate the influence of air-assistant on combustor characteristics. The discrepancies are experimentally explored in terms of lean ignition, blowout, and combustion characteristics in three cavity-based combustors accompanied with numerical flow fields. The results indicate that the air-assistant design can widen the ignitable space for ignition, extend the flammable Mach number, and decrease the lean ignition and blowout fuel/air ratio by 18.6% and 17.9% respectively. The air-assistant method can also accelerate the kernel generation and flamelet growth and suppress the flame quenching in the cavity-strut structure, which enhances the flame stability in either strut-stabilizing or cavity-stabilizing mechanism. The introduction of air-assistant regulates the flame structure and eventually increases the temperature rise of combustor by 250–350 K within the full range of operating fuel/air ratio. Moreover, the temperature distribution altered by air-assisting is more suitable for engineering combustors with higher requirements on circumferential flame propagation.

Keywords: Air-assistant design; Ignition; Flame-holding; Flame-propagation; Cavity; Strut (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261920316925
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:283:y:2021:i:c:s0306261920316925

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2020.116307

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().