Modeling Analysis on Cavity-based Flame Stabilization in Scramjet Combustor

Kun Wu, Peng Zhang, Xuejun Fan

Research output: Unpublished conference presentation (presented paper, abstract, poster)Conference presentation (not published in journal/proceeding/book)Academic researchpeer-review

Abstract

To explore the flame stabilization mechanism in a dual-mode scramjet at low inflow stagnation temperature, the improved delayed detached eddy simulation (IDDES) was conducted. Detailed hydrogen/air combustion chemistry with finite-rate subgrid combustion model was employed to accommodate the involved complex combustion dynamics. The predicted wall pressure agrees well with the experimental data, and both the morphology and the location of the reaction zone were accurately reproduced compared with the measured OH* luminosity. To characterize the cavity-based flame stabilization, the reacting flow in the combustor was analyzed in terms of the shock wave structure and the distributions of temperature and OH radicals. By virtue of the radical evolution and reaction zone analyses, the premixed reaction segment emerging in the cavity shear layer from the cavity leading edge was found to be indispensable in initiating the overall reaction. Essentially, the cavity flame stabilization can be considered as the periodical recirculation of the chemically active radicals associated with the hot reaction products; the thermal chocking at the cavity trailing edge controls the dynamics of the main reaction zone.

Original languageEnglish
Publication statusPublished - 1 Jan 2019
Event12th Asia-Pacific Conference on Combustion, ASPACC 2019 - Fukuoka, Japan
Duration: 1 Jul 20195 Jul 2019

Conference

Conference12th Asia-Pacific Conference on Combustion, ASPACC 2019
Country/TerritoryJapan
CityFukuoka
Period1/07/195/07/19

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Condensed Matter Physics

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