The　efficient　injection　of　fuel　in　the　combustion　chamber　is　significant　for　the　advancement　of　the　current　supersonic　vehicles.　This　study　has　focused　on　the　role　of　non-alignment　injector　configuration　on　the　fuel　mixing　of　the　hydrogen　jet　inside　the　combustion　chamber　of　the　scramjet　engine.　The　fuel　distribution　and　vortex　generation　behind　both　annular　and　coaxial　jets　are　modeled　and　compared　to　disclose　the　mechanism　of　fuel　diffusion　in　the　combustion　chamber.　A　three-dimensional　model　of　two　nozzle　angles　is　produced　to　visualize　the　complicated　flow　interaction　of　four　non-aligned　circular　jets　at　supersonic　cross-flow.　Our　results　indicate　that　the　strength　of　the　vortex　pair　produced　by　the　core　of　the　fuel　jet　is　extended　more　when　the　angle　of　the　nozzles　is　increased.　The　flow　visualization　of　the　jet　also　confirms　that　the　flow　becomes　more　complex　in　non-alignment　jet　configurations　and　fuel　mixing　is　improved　by　the　addition　of　the　internal　air　jet　in　the　suggested　injection　model.　©　2024　Elsevier　Ltd