In　order　to　investigate　the　influence　of　centrifugal　buoyancy　on　the　fluid　flow　and　heat　transfer　in　rotary　machinery,　studies　have　been　carried　out　for　a　rotary　radially　outward　developed　turbulent　flow　by　using　direct　numerical　simulation　(DNS)　method.　The　turbulent　Reynolds　number,　rotation　number　and　Prandtl　number　of　the　flow　are　kept　at　300,　1.5,　0.71,　respectively,　then　simulations　and　analysis　are　conducted　for　characteristics　of　flow　and　heat　transfer　with　Grashof　number　equal　to　0,　9　000,　20　000,　and　50　000,　respectively.　The　results　indicate　that　the　mainstream　velocity,　temperature　and　secondary　flow　all　increase　with　the　centrifugal　buoyancy　forces.　The　maximum　mainstream　velocity　and　the　minimum　temperature　appear　in　the　side　of　the　unstable　wall.　With　the　increase　of　centrifugal　buoyancy　forces,　the　velocity　fluctuation　is　strengthened;　the　temperature　fluctuation　increases　firstly　then　decreases　in　the　side　of　the　unstable　wall,　however　it　decreases　firstly　then　increases　in　the　side　of　the　stable　wall;　the　heat　transfer　performance　on　the　stable　wall　is　enhanced　and　becomes　better　firstly　then　worse　on　the　unstable　wall.　©,　2014,　Hsi-An　Chiao　Tung　Ta　Hsueh/Journal　of　Xi＇an　Jiaotong　University.　All　right　reserved.