To　achieve　high-efficiency　cooling　performance　and　good　uniformity　of　impinging　jet,　a　new　type　of　nozzle　structure　is　proposed.　The　new　nozzle　has　four　circumferential　spiral　channels　symmetrically　distributed　inside　a　normal　smooth　nozzle,　similar　to　an　internal　threads.　The　influences　of　this　nozzle　on　heat　transfer　characteristics　of　impinged　surface　under　different　helix　angles(0°,　15°,　30°,　45°),　Reynolds　numbers　(6　000-30　000)　and　impact　distances　(1　to　8　times　the　equivalent　diameter)　were　studied　experimentally.　And　the　heat　transfer　rule　of　the　impinged　surface　was　revealed.　The　experimental　results　indicate　that　a　big　helix　angle　can　enhance　slightly　the　heat　transfer　coefficient　on　the　impinged　surface.　Compared　with　the　conventional　impinging　jet　from　the　smooth　circular　hole　and　the　hole　with　four　straight　channels,　the　swirling　impinging　jets　from　the　designed　nozzles　are　effective　to　enhance　the　overall　heat　transfer　coefficient　on　the　impinged　surface　under　the　same　conditions.　At　the　impact　distances　of　2　times　and　4　times　the　equivalent　diameter,　Nusselt　numbers　of　the　45-degree　thread　hole　are　7.4%　and　11.4%　higher　than　that　of　conventional　impinging　jet　at　the　stagnation　area,　respectively.　The　heat　transfer　coefficient　on　the　impinged　surface　is　non-linearly　increased　with　the　increase　of　Reynolds　number.　The　maximal　value　of　Nusselt　number　under　a　relative　large　Reynolds　number　occurs　at　the　location　of　0.7　times　the　equivalent　diameter　outside　the　stagnation　point.　With　the　increase　of　the　impact　distance,　the　effect　of　the　swirling　flow　on　the　target　surface　heat　transfer　is　weakened　or　even　disappeared.　©　2018,　Editorial　Office　of　Journal　of　Xi＇an　Jiaotong　University.　All　right　reserved.