Optimized aerodynamic profile for a turbine blade, in particular for a rotary wheel of the first stage of a turbine
View Patent ↗When cold and in the non-coated state, the aerodynamic profile is substantially identical to a nominal profile determined by the Cartesian coordinates X,Y,Z′ given in Table 1, in which the coordinate Z′ is the quotient D/H where D is the distance of the point under consideration from a first reference plane P 0 situated at the base of the nominal profile, and H is the height of said profile measured from the first reference plane to a second reference plane P 1 . The measurements D and H are taken radially relative to the axis of the turbine, while the X coordinate is measured in the axial direction of the turbine.
1. An aerodynamic profile for a turbine blade, the profile being, when cold and in a non-coated state, substantially identical to a nominal profile determined by Cartesian coordinates X,Y,Z′ given in Table 1, in which the coordinate Z′ is a quotient D/H, where D is a distance of a point under consideration from a first reference X,Y plane situated at a base of the nominal profile, and H is a height of said profile measured from said first reference plane that is an intersection of a stacking axis of a set of blades and an axisymmetric surface of a hub, out to a second reference plane that is an intersection of said stacking axis with an axisymmetric surface of a casing, the measurements D and H being taken radially relative to an axis of a turbine, and the coordinate X is measured in an axial direction of the turbine.
2. The aerodynamic profile as claimed in claim 1 , wherein said profile is defined within an envelope of ±1 mm in a direction normal to the surface of the nominal profile.
3. The aerodynamic profile as claimed in claim 1 , wherein the coordinates X,Y of said profile lie within a range of ±5% relative to the coordinates X,Y of the nominal profile.
4. The aerodynamic profile as claimed in claim 1 , wherein the blade is a blade of a rotary wheel forming a portion of a rotor of a turbine.
5. The aerodynamic profile as claimed in claim 4 , wherein the blade is a blade of the rotary wheel of the first stage of the turbine.
6. The aerodynamic profile as claimed in claim 4 , wherein the blade is a blade of the rotary wheel of the first stage of a turbine having four stages.
7. A turbine, including turbine blades presenting aerodynamic profiles as claimed in claim 1 .
8. A turbine as claimed in claim 7 , including a rotary wheel, having 153 to 173 blades.
9. A rotary wheel of a turbine forming a portion of a turbine rotor, wherein all the blades of this rotary wheel present an aerodynamic profile as claimed in claim 1 .
10. A rotary wheel of a turbine as claimed in claim 9 , including 153 to 173 blades.