公开(公告)号：US20230365251A1

公开(公告)日：2023-11-16

申请号：US18245562

申请日：2021-09-22

Applicant: JAPAN AEROSPACE EXPLORATION AGENCY

Inventor： Mitsuru KURITA ,  Hiroyuki ABE ,  Hidetoshi IIJIMA ,  Seigo KOGA

IPC: B64C21/10 ,  F15D1/12 ,  F15D1/00

CPC classification number: B64C21/10 ,  F15D1/004 ,  F15D1/12 ,  B64C2230/26

Abstract: [Object] To provide a riblet structure that increases resistance reducing performance and is easily manufacturable, and an object including such a structure on a surface thereof. [Solving Means] This riblet structure includes a plurality of wave-shaped riblets on a surface thereof, in which each of the riblets has a smaller peak height as an angle formed between a ridge line and a fluid flow direction becomes larger, a width between peak bases in a direction orthogonal to the fluid flow direction becomes smaller as the angle becomes larger, and an angle formed between a slope of a peak of the riblet and the surface at the peak base or a curvature at the peak base is identical at any position in a cross-sectional shape in the direction orthogonal to the fluid direction.

公开(公告)号：US20250083794A1

公开(公告)日：2025-03-13

申请号：US18292034

申请日：2022-05-16

Applicant: JAPAN AEROSPACE EXPLORATION AGENCY

Inventor： Mitsuru KURITA ,  Hiroyuki ABE ,  Monami SASAMORI ,  Seigo KOGA

IPC: B64C3/18

Abstract: A riblet structure according to the present technology includes a plurality of riblets that are arranged in a width direction and each include a first wall portion and a second wall portion, the first wall portion being vertically provided to be substantially perpendicular to a bottom portion, the second wall portion including an inclined portion connected to the first wall portion at an apex portion and inclined with respect to a perpendicular direction at a predetermined angle.