High-Spatial-Resolution OH PLIF Visualization in a Cavity-Stabilized Ethylene-Air Turbulent Flame

Geipel, Clayton M.; Rockwell, Robert D.; Chelliah, Harsha K.; Cutler, Andrew D.; Spelker, Christopher A.; Hashem, Zeid; Danehy, Paul M.

doi:10.2514/6.2017-3901

Cited by 11 publications

(1 citation statement)

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“…The flow condition and computational domain are set by referencing a series of studies on the dual-mode, direct-connect combustor at the University of Virginia Supersonic Combustion Facility, [41][42][43][44] especially the recent numerical simulations of Sitaraman et al 29 and Johnson et al 45 The computational domain is basically a quasi-3D planner channel with a cavity embedded in the bottom wall, as shown in Fig. 1.…”

Section: B Numerical Methodsmentioning

confidence: 99%

Direct numerical simulation of supersonic internal flow in a model scramjet combustor under a non-reactive condition

2023

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A Mach 1.5 non-reactive flow in a cavity-stabilized combustor of a model scramjet is studied via a direct-numerical simulation approach, and the analysis is focused on the interaction among boundary layer, free shear-layer above the cavity and shock wave. It is found that the impingement of the free shear-layer on the aft wall of the cavity leads to strong turbulence kinetic energy, high local pressure, and a fan of compression waves. The compression waves evolve into an oblique shock, which reflects between the upper and lower walls and interacts with the boundary layers attached to the two walls. The analysis of the turbulence production reveals that the amplification of turbulence in the core of the shear-layer and around the reattachment point is mainly due to the shear production, but the deceleration production mechanism presents a significant impact in the regions above the aft wall of the cavity and around the shock interaction points. The very low frequency commonly observed in shock wave/boundary layer interactions is not observed in the present research, which might be due to the low Reynolds number of the studied case.

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