Skip to Main content Skip to Navigation
Journal articles

Analysis of combustion modes in a cavity based scramjet

Abstract : Large eddy simulations (LES) of non reactive and reactive flows in a cavity-based scramjet combustor configuration from the U.S Air Force Research Laboratory (AFRL) are performed. These simulations feature a 22 species and 206 reactions chemical scheme for ethylene/air. The ability of LES to reproduce the main features found in the experiment is first emphasised such as the average velocity field and the stability of the combustion for the case studied. The influence of the mesh resolution and of the thermal wall condition on the simulation results is also investigated along with the soundness of the use of a laminar model for the filtered source terms. The results of the simulations with the finest grid (resolution of 100 micrometers in the flame region) are then employed to gain understanding in the flame dynamics. This reactive simulation shows the persistence of the two recirculation zones already present in the non reactive flow. The globally high temperature into the cavity helps to sustain a reactive zone located in the mixing layer above the cavity. Combustion first occurs in a diffusion dominated regime followed by the efficient burning of a well stirred mixture (rich then lean). A significant diffusion dominated burning is also found inside the cavity. The links between the residence time inside the cavity and the efficiency of the combustion are explored along with the velocity/heat release correlation.
Document type :
Journal articles
Complete list of metadatas

https://hal-normandie-univ.archives-ouvertes.fr/hal-02559646
Contributor : Pascale Domingo <>
Submitted on : Friday, December 4, 2020 - 9:14:40 PM
Last modification on : Wednesday, December 9, 2020 - 9:10:56 AM

File

7_bis_2020_CNF_RUAN.pdf
Files produced by the author(s)

Identifiers

Citation

Jiangheng Ruan, Pascale Domingo, Guillaume Ribert. Analysis of combustion modes in a cavity based scramjet. Combustion and Flame, Elsevier, 2020, 215, pp.238-251. ⟨10.1016/j.combustflame.2020.01.034⟩. ⟨hal-02559646⟩

Share

Metrics

Record views

38

Files downloads

17