Using　riblet　structures　to　modulate　the　turbulent　boundary　layer　to　reduce　frictional　drag　is　important　for　vehicle　stability　and　range.　The　flow　on　the　airfoil　surface　at　different　angles　of　attack　is　different,　and　the　effect　of　the　riblets　structure　on　the　turbulent　boundary　layer　flow　will　be　changed,　which　in　turn　affects　the　drag　reduction　effect.　In　this　paper,　the　drag　reduction　characteristics　of　V-shaped　riblets　are　investigated　experimentally　by　the　particle　image　velocimetry　technique.　The　distributions　of　mean　velocity,　friction　coefficient,　drag　reduction　rate,　and　coherent　structure　in　the　boundary　layer　on　the　airfoil　surface　at　angles　of　attack　from　0°　to　12°　are　analyzed,　and　the　effects　of　smooth　and　riblets　surfaces　on　the　turbulent　flow　characteristics　near　the　wall　are　compared.　Based　on　these　results,　the　airfoil　surface　was　zonally　covered　with　riblets　to　investigate　further　the　effects　of　the　riblets＇　covering　positions　on　the　drag　reduction　of　the　airfoil　at　different　angles　of　attack.　The　results　show　that　the　riblets　reduce　the　intensity,　distribution,　and　probability　of　the　eject　and　sweep　events　in　the　turbulence　bursts　by　suppressing　the　velocity　fluctuations　at　the　near-wall　surface,　thus　realizing　the　reduction　of　turbulence　drag.　The　zoned　arrangement　of　riblets　can　effectively　regulate　the　airfoil　surface　flow　and　reduce　the　unfavorable　effects　of　the　riblets　on　the　laminar　flow　region　and　flow　separation　region　on　the　surface　of　the　airfoil　with　different　angles　of　attack,　and　the　results　of　the　study　can　provide　a　reference　for　the　influence　of　the　coverage　range　of　the　riblets　on　the　drag　reduction　effect.　©　2024　Author(s).