RAISED STRUCTURE, WING, DESIGN METHOD OF RAISED STRUCTURE AND DESIGN PROGRAM THEREOF

To provide a raised structure which suppresses amplification of disturbance due to lateral flow instability on the surface of a front edge region of an object, retreats the position on which turbulent flow transition is caused, and thereby can enlarge an area of laminar flow boundary layer.SOLUTION: A raised structure includes a plurality of raised bodies 2a which are provided on an upper surface 1c of a front edge region of direct downstream of front edge provided as a laminar flow area of a wing provided with the front edge so as to have a retreat angle with respect to a main flow and are extended in parallel toward the downstream side of the main flow. When ridges which link summits of the respective raised bodies 2a in an extending direction of the raised bodies 2a has an angle with respect to x direction as a ridge angle θR, an angle with respect to x direction of a flow line in a boundary layer outer edge of the main flow as a boundary layer outer edge angles θe and have latent flow instability angles θcf as angles with respect to x-direction of wave faces of steady latent flow instability as a mode which appears as steady vortex street by amplifying steady turbulence within a boundary layer of the surface, the ridge angle θR exists between the boundary layer outer edge angle θe and the latent flow instability angles θcf.SELECTED DRAWING: Figure 2 【課題】物体の前縁領域の表面における横流れ不安定性による擾乱の増幅を抑制し、乱流遷移が起こる位置を後退させて層流境界層の領域を拡大させることができる隆起構造を提供する。【解決手段】主流に対して後退角を有して前縁が設けられた翼の層流領域とされた前縁の直下流の前縁領域の上面１ｃに設けられ、主流の下流側に向かって並列に延在する複数の隆起体２ａを備え、各隆起体２ａの頂点を隆起体２ａの延在方向に連ねた稜線が、ｘ方向に対する角度を稜線角度θRとし、主流の境界層外縁における流線のｘ方向に対する角度を境界層外縁角度θeとし、表面の境界層内で定在的な擾乱が増幅して定在渦列として現れるモードである定在横流れ不安定性の波面のｘ方向に対する角度を横流れ不安定性角度θcfとしたときに、稜線角度θＲは、境界層外縁角度θeと横流れ不安定性角度θcfとの間である。【選択図】図２