A blade for a turbomachine, in particular for a rotor of a helicopter. A main section is designed to create a flow in the surrounding medium and extends from a hub section to a blade tip region. An end piece for influencing eddy formation in the blade tip region. To achieve a substantial noise reduc
A blade for a turbomachine, in particular for a rotor of a helicopter. A main section is designed to create a flow in the surrounding medium and extends from a hub section to a blade tip region. An end piece for influencing eddy formation in the blade tip region. To achieve a substantial noise reduction, the end piece is designed as a rounded flow body comprising at least one groove originating in the transition region between the body and the main section, substantially in the direction of the blade axis and curving towards the trailing edge of the blade.
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1. Blade for a turbomachine, the blade having a leading edge and a trailing edge, the blade comprising: a main portion which is formed so as to create a flow in the surrounding medium when the blade leading edge moves relative to the medium, the main portion extending from a hub portion to a blade t
1. Blade for a turbomachine, the blade having a leading edge and a trailing edge, the blade comprising: a main portion which is formed so as to create a flow in the surrounding medium when the blade leading edge moves relative to the medium, the main portion extending from a hub portion to a blade tip region including a blade tip, andan end piece for influencing eddy formation being provided in the blade tip region,the end piece is formed as a rounded flow body comprising first and second blade sections with the blade tip disposed between the first and second blade sections, the first and second blade sections defining at least one groove which starts in the first blade section and continues through the blade tip into the second blade section, the at least one groove in the first blade section being oriented substantially in the axial direction of the blade, in a transition region of the first blade section into the main portion, and curving relative to the blade axis, convexly towards the trailing edge of the blade to the blade tip, the at least one groove in the second blade section being oriented substantially in the axial direction of the blade, in a transition region of the second blade section into the main portion, and curving relative to the blade axis, covexly towards the trailing edge of the blade to the blade tip, the at least one groove in the first blade section and the at least one groove in the second blade section together defining a curve apex at the blade tip that points to the blade trailing edge. 2. Blade according to claim 1, wherein the at least one groove in the first blade section is defined substantially in the flow direction at the outline of the end piece. 3. Blade according to claim 1, wherein the at least one groove on the first blade section joins the corresponding at least one groove on the second blade section and said grooves together span opposite profile sides of the blade end piece at the outline of the end piece. 4. Blade according to claim 1, wherein the at least one groove in the first blade section is convex in form in the flow direction. 5. Blade according to claim 1, wherein the at least one groove in the first blade section becomes increasingly deep starting from the transition region. 6. Blade according to claim 1, wherein the at least one groove in the first blade section becomes increasingly wide starting from the transition region. 7. Blade according to claim 1, wherein at least three grooves are provided adjacent to one another in the first and second blade sections. 8. Blade according to claim 1, wherein the end piece is formed asymmetrically about the plane of the rotor blade. 9. The blade of claim 1 wherein the blade comprises a helicopter rotor. 10. The blade of claim 1 wherein the blade comprises a rotor. 11. The blade of claim 1 wherein the blade defines a plurality of said grooves that follow similar spaced-apart paths. 12. The blade of claim 1 wherein the rounded flow body provides a smooth transition in a longitudinal section through the blade from an upper side of the blade, the end piece curving constantly as far as a line which defines the maximum extent of the end piece in the plane of the blade and joining tangentially, with constant curvature, into the underside of the main portion from the line. 13. The blade of claim 1 wherein the rounded flow body is rounded from the leading edge to the trailing edge. 14. The blade of claim 1 wherein the blade has a leading side edge and a trailing side edge, and the at least one groove in the first blade section starts substantially parallel to the blade axis and curves towards the trailing side edge of the blade. 15. Wing blade having leading and trailing edges, the blade comprising: a main portion extending along a blade axis from a hub portion to a blade tip region and structured so as to create a flow in the surrounding medium as the blade leading edge moves relative to the medium,the blade tip region comprising an end piece rounded flow body for influencing eddy formation terminating in a blade tip,the end piece comprising first and second blade sections with the blade tip disposed therebetween, the first and second blade sections having a plurality of spaced-apart curved grooves disposed therein, each of the plurality of curved grooves having ends disposed respectively in transition regions of each of the first and second blade sections from the end piece into the main portion, each groove extending from the groove end in each of the first and section blade sections substantially in the direction of the blade axis and curving relative to the blade axis, convexly towards the trailing edge of the blade to the blade tip, the plurality of grooves in the first blade section and the plurality of grooves in the second blade section together defining curve apexes at the blade tip that point to the blade trailing edge. 16. The blade of claim 15 wherein the blade tip region has no holes therethrough. 17. The blade of claim 15 wherein the blade comprises a helicopter rotor. 18. The blade of claim 15 wherein the blade comprises a rotor. 19. The blade of claim 15 wherein the plurality of spaced-apart curved grooves follow similar spaced-apart paths. 20. The blade of claim 15 wherein the rounded flow body provides a smooth transition in a longitudinal section through the blade from an upper side of the blade, the end piece curving constantly as far as a line which defines the maximum extent of the end piece in the plane of the blade and joining tangentially, with constant curvature, into the underside of the main portion from the line, each groove starting substantially in the direction of the blade axis, in the transition region into the main portion, and curving towards the trailing edge of the blade. 21. The blade of claim 15 wherein the rounded flow body is rounded from the leading to the trailing edge, each groove starting substantially in the direction of the blade axis, in a transition region into the main portion, and curving towards the trailing edge of the blade. 22. The blade of claim 15 wherein the blade has a leading side edge and a trailing side edge, and the grooves start substantially parallel to the blade axis, in the transition region into the main portion, and curve towards the trailing side edge of the blade. 23. Blade for a turbomachine, the blade having a leading edge and a trailing edge, an upper side and an underside, the blade comprising: a main portion which is formed so as to create a flow in the surrounding medium when the blade leading edge moves relative to the medium, the main portion extending from a hub portion to a blade tip region including a blade tip, andan end piece for influencing eddy formation being provided in the blade tip region,the end piece being formed as a rounded flow body comprising an upper side, a lower side, and a blade tip disposed therebetween, the blade upper side and lower side together defining at least one groove defined in the upper side through the blade tip to the lower side, the rounded flow body providing a smooth transition in a longitudinal section through the blade from the upper side of the blade, the end piece curving constantly as far as a line which defines the maximum extent of the end piece in the plane of the blade and joining tangentially, with constant curvature, into the underside of the main portion from the line, the groove starting substantially in the direction of the blade axis, in a transition region into the main portion, and curving towards the trailing edge of the blade, the groove defined in the upper side through the blade tip to the lower side having an apex at the blade tip that points to the blade trailing edge. 24. Blade for a turbomachine, the blade having a leading edge and a trailing edge, the blade comprising: a main portion which is formed so as to create a flow in the surrounding medium when the blade leading edge moves relative to the medium, the main portion extending from a hub portion to a blade tip region including a blade tip, andan end piece for influencing eddy formation being provided in the blade tip region,the end piece being formed as a rounded flow body comprising first and second blade sections with the blade tip region disposed therebetween, at least one groove being defined in the first blade section through the blade tip to the second blade section, the rounded flow body being rounded from the leading to the trailing edge, the at least one groove starting substantially in the direction of the blade axis, in a transition region of the first blade section into the main portion, and curving towards the trailing edge of the blade, the at least one groove starting substantially in the direction of the blade axis in a transition re on of the second blade section into the main portion, and curving towards the trailing edge of the blade, the groove defined in the first blade section through the blade tip to the second blade section having an apex at the blade tip that points to the blade trailing edge. 25. Blade for a turbomachine, the blade having a leading side edge and a trailing side edge, the blade comprising: a main portion which is formed so as to create a flow in the surrounding medium when the blade leading side edge moves relative to the medium, the main portion extending from a hub portion to a blade tip region including a blade tip, andan end piece for influencing eddy formation being provided in the blade tip region,the end piece being formed as a rounded flow body comprising first and second blade sections with the blade tip region therebetween, —at least one groove, which starts in the first blade section and extends through the blade tip to the second blade section the at least one groove starting in the first blade section substantially parallel to the blade axis, in a transition region of the first blade section into the main portion, and curves towards the trailing side edge of the blade, the at least one groove also starting substantially parallel to the blade axis, in a transition region of the second blade section into the main portion, and curving towards the trailing side edge of the blade, the at least one groove defined in the first blade section extending through the blade tip to the second blade section defining an apex at the blade tip that points to the blade trailing side edge.
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