Mixing efficiency of hydrogen jet through multi lobe-injectors at scramjet engine: A numerical study

Fuel mixing efficiency of transverse hydrogen multi-jet was fully investigated for the lobe-shape nozzle. This study examined the impacts of three different lobe-injector on the performance of penetration and mixing of the hydrogen multi-jet inside the combustor of the scramjet engine. The modeling method of CFD is employed to scrutinize the flow structure of hydrogen gas injected from four multi-jet with 2 lobe, 3-lobe, and 4-lobe injectors. Mach number, mixing zone, and fuel concentration for these injectors are fully investigated and fuel mixing and circulation factors are compared downstream of these jet configurations. Our outputs indicate that the application of a 3-lobe injector enhances fuel mixing and penetration more than other nozzles. It is also noticed that fuel mixing is directly associated to the power of upstream vortex generated nearby the first injector. According to our findings, the strength of circulation of 3-lobe injector is 20% more than 2-lobe and 4-lobe ones and consequently, its mixing performance is 15% more than these two injector configurations. (c) 2021 Elsevier Masson SAS. All rights reserved.

Automated summary

The fuel mixing efficiency of a transverse hydrogen multi-jet with lobe-shape nozzle was investigated in this study. The results showed that the application of a 3-lobe injector enhanced fuel mixing and penetration more than other nozzles. Fuel mixing was found to be directly associated with the power of the upstream vortex generated nearby the first injector.