Riblet structure and object
AssigneeJapan Aerospace Exploration Agency
InventorsMitsuru Kurita, Hiroyuki Abe, Hidetoshi Iijima, Seigo Koga
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Abstract
A 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.
Claims10
A riblet structure, comprising:
- a plurality of wave-shaped riblets being arranged in parallel in a first direction on a surface thereof,
- wherein an amplitude direction of waves of the wave-shaped riblets is the same as the first direction,
- wherein each of the riblets has a smaller peak height from the surface as a first angle formed between a ridge line of the riblet and a second direction becomes larger, the second direction being an advance direction of waves of the wave-shaped riblets,
- wherein a width between peak bases, of wave-shaped riblets of the plurality of wave-shaped riblets that are adjacent to each other, in the first direction becomes smaller as the first angle becomes larger, and
- wherein a second 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 first direction.
An object, comprising:
- a riblet structure including a plurality of wave-shaped riblets being arranged in parallel in a first direction on a surface thereof,
- wherein an amplitude direction of waves of the wave-shaped riblets is the same as the first direction,
- wherein each of the riblets has a smaller peak height from the surface as a first angle formed between a ridge line of the riblet and a second direction becomes larger, the second direction being an advance direction of waves of the wave-shaped riblets,
- wherein a width between peak bases, of wave-shaped riblets of the plurality of wave-shaped riblets that are adjacent to each other, in the first direction becomes smaller as the angle becomes larger, and
- wherein a second 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 first direction.
A riblet structure, comprising:
- a plurality of wave-shaped riblets on a surface thereof,
- wherein each of the riblets has a smaller peak height as a first angle formed between a ridge line and a first direction becomes larger, the first direction being an advance direction of waves of the wave-shaped riblets,
- wherein a width between peak bases in a direction orthogonal to the first direction becomes smaller as the first angle becomes larger,
- wherein a second 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 first direction,
- wherein the ridge line of each of the riblets has a sinusoidal shape, and
- wherein a height of each of the riblets changes in a sinusoidal manner.
Dependencies are inferred from the claim text.