Improvement of the fuel mixing of ramp injector system via 4-lobe nozzle at scramjet engine

Wei Fu, N.A. Razak, Haixin Wang, Xiaohui Sun and Zongxian Song

Energy, 2025, vol. 315, issue C

Abstract: The ramp injection system has been extensively used for the fuel distribution and mixing inside the combustor of scramjet engines. This article presents a three-dimensional numerical study of the ramp injection system with an annular four-lobe nozzle at supersonic flow (Mach = 2). The finite volume approach is selected for the modeling of supersonic airflow and hydrogen jet near the ramp injector. The usage of internal air jets for enhancement of the fuel mixing is also investigated in the present study. Meanwhile, distribution of the fuel jet by the production of the vortex is fully analysed. The trails of fuel concentration and interactions of the injected fuel with the free stream behind the jet are fully investigated in this research. The obtained result shows that the 4-lobe nozzle results in three vortex pairs which considerably improve the fuel diffusion into the free stream air flow. Moreover, the addition of an air jet expands these vortex pairs, and consequently, fuel mixing is improved by 85 % near the 4-lobe injector.

Keywords: Supersonic combustion; Computational fluid dynamic; Compressible flow; Fuel mixing; Hydrogen (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:315:y:2025:i:c:s0360544224041057

DOI: 10.1016/j.energy.2024.134327

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