In　this　study,　the　thermal　and　hydraulic　performances　of　fin　array　with　a　wedge　shield　installed　in　the　bypass　to　alter　the　flow　were　experimentally　and　numerically　investigated.　The　effect　of　the　wedge　shield　inclination　angle　was　explored　at　Reynolds　numbers　ranging　from　2753　to　20,825.　The　mean　Nusselt　number　and　friction　factor　were　measured　in　a　wind　tunnel　with　the　varying　volume　rate　of　inlet　air　flow.　The　comprehensive　performance　evaluation　criteria　under　identical　pressure　drop　and　identical　pumping　power　were　adopted　to　evaluate　the　effect　of　the　wedge　shield.　The　velocity,　temperature　and　pressure　fields,　and　the　local　Nusselt　number　were　characterized　using　ANSYS　Fluent.　The　results　indicated　that　the　heat　transfer　enhanced　and　the　flow　resistance　increased　by　the　wedge　shield　effect.　At　a　same　Reynolds　number,　the　mean　Nusselt　number　and　friction　factor　reach　their　maximum　values　at　θS=10　and　θS=60,　respectively.　According　to　the　comprehensive　performance　evaluation,　the　applicable　condition　of　wedge　shield　to　enhance　fin　array　performance　was　the　inclination　angle　θS=135　at　Reynolds　number　Re=3286,　in　which　the　enhancement　was　approximately　9%　under　identical　pressure　drop　and　14%　under　identical　pumping　power.　The　numerical　results　showed　that　the　velocity　increase　in　fin　channel　and　recirculation　zone,　caused　by　the　blockage　of　the　wedge　shield,　was　the　fundamental　mechanism　of　wedge　shield　to　enhance　the　heat　transfer　and　increase　the　flow　resistance.　The　velocity　increase　and　recirculation　zone,　along　with　the　low　temperature　region　and　high　pressure　in　the　entrance　region　of　the　fin　channel　caused　by　them,　were　all　affected　by　the　wedge　shield　inclination　angle.　©　2022