An　elliptical　inlet　nozzle　is　designed　for　the　multi-blade　centrifugal　fan　used　in　range　hoods.　The　influence　of　the　elliptical　inlet　nozzle　on　the　aerodynamic　performance　of　the　multi-blade　centrifugal　fan　is　studied　by　numerical　simulation.　Compared　with　the　traditional　round　inlet　nozzle,　the　flow　separation　in　the　clearance　of　the　inlet　nozzle　is　weakened　and　the　flow　in　the　volute　can　be　improved.　The　results　show　that　compared　with　the　original　fan,　the　volume　flow　rate　of　the　multi-blade　centrifugal　fan　with　elliptical　inlet　nozzle　increases　by　7.7%.　©　2019,　Science　Press.　All　right　reserved.