© 2020 Elsevier Masson SAS Penetration and distribution of fuel inside the supersonic combustor significantly influence on the overall performance of the scramjet. This research employed the numerical technique to examine the mixing performance of the multi-hydrogen jets at supersonic airflow when the downstream step exists in the downstream of the jet. CFD simulations are conducted to disclose the feature of multi jets when a downstream step is applied. The effects of back step height, free stream Mach number and fuel jet pressure on the mixing efficiency of the four hydrogen jets are disclosed. Our study indicates that decreasing the back step height from 3 mm to 1.5 mm increases the mixing rate up to 28% in downstream of the multi jets. Besides, the formation of the normal shock in upstream of the jet reduces fuel mixing while the normalized mixing factor of fuel jets enhances in downstream of injectors.
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