©　2016,　Harbin　Research　Institute.　All　right　reserved.The　flow　and　heat　transfer　characteristics　of　the　rotor　stator　cavity　with　circle　pre-swirl　nozzle　structures　was　numerically　investigated　using　three-dimensional　Reynolds-Averaged　Navier-Stokes　(RANS)　and　SST　turbulence　model.　The　numerical　drag　coefficient　and　Nu　coefficient　distributions　in　the　rotor　stator　cavity　are　well　agreed　with　the　experimental　data.　The　reliability　of　the　utilized　numerical　method　is　also　demonstrated.　Three　different　turbulent　flow　parameters　and　pre-swirl　ratios　are　used　to　analyze　the　flow　and　heat　transfer　performance　of　the　rotor　stator　system　with　circle　pre-swirl　nozzles.　The　obtained　results　show　swirl　ratio,　static　pressure　coefficient　and　the　heat　transfer　on　the　rotating　disc　increase　as　the　turbulent　flow　parameter　increases　and　vary　apparently　along　the　circumference　because　of　the　impingement　of　the　pre-swirl　flow.　The　drag　coefficient　is　gradually　increasing　along　the　radial　direction　due　to　the　influence　of　the　rotary　pump,　and　the　non-uniformity　along　the　circumferential　direction　at　the　inlet　and　outlet　position　are　observed　due　to　the　inlet　preswirl　flow　influence.　The　rotational　disc　works　on　the　flow　and　increases　the　total　temperature　at　the　low　preswirl　inlet　flow　condition.　The　total　temperature　of　the　fluid　is　relative　low　at　the　preswirl　ration　obtains　1.5　due　to　the　rotational　disc　does　not　work　on　the　fluid　and　drive　the　fluid　rotation.　The　inlet　flow　impinges　into　the　rotational　disc　and　results　in　the　non-uniformity　distribution　of　the　Nu　along　the　circumferential　direction.　This　flow　behavior　leads　to　the　high　heat　transfer　region　at　the　rotational　disc　surface.