Hydrogen　can　be　used　as　fuel　to　replace　gasoline,　with　the　benefit　of　reducing　harmful　emissions　of　rotary　engine　(RE).　The　swirl　chamber　(SC)　coupling　spark　plug　and　nozzle　will　achieve　diffusion　combustion　and　higher　power　as　compared　to　the　conventional　spark　plug.　In　the　current　work,　a　CFD　model　of　a　hydrogen-fueled　rotary　engine　with　swirl　chamber　(HFRE-SC)　is　established　to　study　the　impacts　of　hydrogen　injection　timing　(HIT)　and　hydrogen　injection　duration　(HID)　on　combustion　characteristics　of　HFRE-SC.　Results　reveal　that　SC　combustion　system　may　achieve　more　combustion　efficiency　and　higher　indicated　power　when　compared　to　port　injection　(PI).　Moreover,　lean　hydrogen　in　the　rear　of　combustion　chamber　(ROCC)　can　result　from　retarding　HIT　and　extending　HID.　In　addition,　when　the　rich　zone　in　SC　moves　toward　the　spark　plug,　making　it　difficult　for　flames　to　develop　and　spread.　The　best　performance　can　be　obtained　when　using　the　HIT　at　75　°CA　BTDC　and　the　HID　during　35　°CA,　with　an　8.42　%　up　in　indicated　power　compared　to　the　PI.　©　2024　Elsevier　Ltd