The　present　study　established　a　CFD　model　for　compound-ported　rotary　engine　and　validated　by　experimental　results.　The　numerical　model　was　employed　to　investigate　the　influence　of　engine　speed　on　the　performance　of　pure　gasoline　and　hydrogen/gasoline　bi-fuel　rotary　engines,　respectively.　Results　showed　that,　the　mass　of　OHà　O　and　H　radicals　increased　after　hydrogen　addition,　which　could　accelerate　the　velocity　of　flame　propagation　and　accordingly　improve　combustion　efficiency.　In-cylinder　velocity　and　turbulent　kinetic　energy　increased　significantly　with　the　increment　of　the　engine　speed,　whereas　the　flame　speed　decreased　in　contrast　to　rotor　movements.　Compared　with　the　engine　speed　of　3000　r/min,　the　peak　pressure　reduced　by　4.22%,　11.17%　and　22.21%　for　engine　speed　of　4500　r/min,　6000　r/min　and　9000　r/min,　and　its　corresponding　crank　angle　retarded　by　5.2℃A,　7.5℃A　and　12.8℃A,　respectively.　When　the　engine　speed　was　3000　r/min,　the　carbon　monoxide　production　was　the　lowest　in　the　combustion　chamber,　though　the　nitric　oxide　mass　increased　slightly.　©　2020,　Science　Press.　All　right　reserved.