Airfoil and machine provided with same

Abstract

Provided are an airfoil capable of suppressing peeling on an airfoil surface and a machine provided with the same. An airfoil includes an airfoil portion having a first airfoil surface and a second airfoil surface respectively extending along a spanwise direction between a leading edge and a trailing edge and having a symmetrical shape with respect to a chord; and one communication hole extendingin the airfoil portion and having a first opening end opening to the first airfoil surface and a second opening end opening to the second airfoil surface. The first opening end is located on a first cross-section orthogonal to the spanwise direction. The second opening end is located on a second cross-section orthogonal to the spanwise direction. In the first or second cross-section, an angle A1 satisfying condition (a) is present in an angle range of-10 degrees to 10 degrees inclusive with respect to a straight line centered on the leading edge, the straight line being parallel to an inflow direction of a fluid under an operation condition based on a design point of an airfoil-mounted device. Condition (a) is that the static pressure at the first open end on the first airfoil is equal tothe static pressure at the second open end on the second airfoil when the airfoil is subjected to a fluid flow from the direction of angle Al towards the direction of the leading edge.

Description

technical field [0001] The present disclosure relates to a wing and a machine including the wing. Background technique [0002] In a wing applied to a machine such as a fluid machine or an aircraft, loss due to separation of flow on the airfoil or the like may occur, thereby degrading the performance or operating efficiency of the machine. Therefore, the airfoil may be designed so as to reduce losses due to fluid separation or the like. [0003] For example, Patent Document 1 discloses a turbine blade in which a bypass flow path penetrating from the ventral side (positive pressure surface side) to the back side (negative pressure surface side) is provided in the vicinity of the largest thickness portion of the airfoil portion close to the support wall surface. In this turbine blade, at a position close to the support wall surface, a part of the working fluid is bypassed from the vent side to the back side via the bypass flow path, thereby reducing the pressure difference be...

AI Technical Summary

Problems solved by technology

[0002] In wings applied to machines such as fluid machines and aircraft, losses due to flow separation on the airfoil surface may occur, and the performance or operating efficiency of the machine may decrease as a result.

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