Fluid apparatus
Structures are formed in a shape protruding from a wing surface, and a plurality of riblets are formed in a shape depressed from the wing surface. A first cross section obtained by cutting the structure by a flat face that is parallel to a flow and perpendicularly intersects with the wing surface has an inclined side that extends from a point on the wing surface to a top that is a point apart from the wing surface. An inter-structure flow channel is formed between two adjacent structures among the plurality of structures. The area of a face in one of the two structures and the area of a face in the other structure with which a fluid flowing in the inter-structure flow channel comes into contact are different from each other. Accordingly, peeling of the flow can be suppressed and the frictional resistance of the flow can be decreased.
1. A fluid apparatus comprising:
a plurality of wings between which a fluid flows;
a plurality of structures that are provided on a wing surface that is a surface of each said wing and are formed in a shape protruding from the wing surface, and
a plurality of riblets that are provided on the wing surface and that are formed in a shape depressed from the wing surface, wherein
a first cross section obtained by cutting the structure while passing through a top of the structure by a flat face that is parallel to the flow of the fluid and perpendicularly intersecting with the wing surface, the first cross section having a side that extends from a first point on the wing surface to a second point spaced apart from the wing surface and downstream with respect to the flow of the fluid from the first point, and
an inter-structure flow channel that is formed between two adjacent said structures among the plurality of structures,
wherein a first area of the first cross section of one of the two adjacent structures and a second area of the first cross section of the other of the two adjacent structures, between which the fluid flows in the inter-structure flow channel, are different from each other, and
wherein a second cross section obtained by cutting the structure while passing through the top of the structure by the flat face perpendicular to the flow of the fluid is an asymmetric polygon.
2. The fluid apparatus according to claim 1 , wherein in the first cross section, an inclined angle of the side with respect to the wing surface is 10 degrees or larger and 45 degrees or smaller.
3. The fluid apparatus according to claim 1 , wherein each said polygon of the two adjacent structures has the same number of sides and are different in size from each other.
4. The fluid apparatus according to claim 3 , wherein
the structure is formed in a shape of a pyramid,
the first cross section includes a triangle having a base that shares the first point at one end and extends downstream to a third point at an other end that is on the wing surface,
an inclined angle of the side with respect to the wing surface is an angle formed by the base and the side, and
the second cross section of each of the two adjacent structures includes two triangles that are different in size from each other.
5. The fluid apparatus according to claim 4 , wherein in the second cross section, the respective two triangles have a height ratio of 0.1 or larger and 0.6 or smaller.
6. The fluid apparatus according to claim 4 , wherein in the second cross section the respective two triangles have a base length ratio of 0.1 or larger and 0.6 or smaller.
7. The fluid apparatus according to claim 3 , wherein
the structure is formed in a frustum shape,
the first cross section includes a quadrangle having a base that shares the first point at one end and extends downstream to a third point at an other end that is on the wing surface,
an inclined angle of the side with respect to the wing surface is an angle formed by the base and the side, and
the second cross section of each of the two adjacent structures includes two quadrangles that are different in size from each other.
8. The fluid apparatus according to claim 7 , wherein in the second cross section the respective two quadrangles have a height ratio of 0.1 or larger and 0.6 or smaller.
9. The fluid apparatus according to claim 7 , wherein in the second cross section the respective two quadrangles have a base length ratio of 0.1 or larger and 0.6 or smaller.
10. The fluid apparatus according to claim 1 , wherein a third cross section obtained by cutting the riblet by a flat face perpendicular to the flow of the fluid has a triangular groove cross section.
11. The fluid apparatus according to claim 1 , wherein the third cross section obtained by cutting the riblet by the flat face perpendicular to the flow of the fluid has a quadrangular groove cross section.
12. The fluid apparatus according to claim 1 , wherein
the structure is formed in a shape of a pyramid,
the first cross section includes a triangle having a base that shares the first point at one end and extends downstream to a third point at an other end that is on the wing surface,
an inclined angle of the side with respect to the wing surface is an angle formed by the base and the side, and
the second cross section of each of the two adjacent structures includes a triangle whose lengths of two inclined sides extending from both end points of the base are different from each other.
13. The fluid apparatus according to claim 12 , wherein the length ratio of the two inclined sides is 0.1 or larger and 0.6 or smaller.
14. The fluid apparatus according to claim 1 , wherein
the structure is formed in a frustum shape,
the first cross section includes a quadrangle having a base that shares the first point at one end and extends downstream to a third point at an other end that is on the wing surface,
an inclined angle of the side with respect to the wing surface is an angle formed by the base and the side, and
the second cross section of each of the two adjacent structures includes a quadrangle whose lengths of two opposite sides extending from both end points of the base are different from each other.
15. The fluid apparatus according to claim 14 , wherein the length ratio of the two opposite sides is 0.1 or larger and 0.6 or smaller.