Turbomachine blade with improved cooling

A turbine blade of a turbomachine, intended to be mounted around an axis of rotation on a rotor disc rotating around the axis of rotation, comprising a root for mounting it in a cell of the disc, and a hollow vane extending from the root in a radial spanwise direction ending in a tip forming a squealer, the vane comprising a lower surface wall and an upper surface wall, as well as a leading edge, a trailing edge and a tip wall delimiting a bottom of the squealer, and by which the lower surface wall is connected to the upper surface wall, this vane also comprising:

• a trombone type middle circuit, including a first duct configured to collect air at the root and which is connected by a first elbow to a second duct which is connected by a second elbow to a third duct, these first, second and third ducts extending in the radial spanwise direction, the second and third ducts being located between the first duct and the trailing edge;
• a cavity under the squealer located on a side of the upper surface wall and the tip wall and which extends along the tip to the trailing edge;
• a central duct extending laterally between the upper surface wall and the second duct of the trombone type middle circuit, this central duct configured to collect air at the root and extending between at least two of the three ducts of the trombone type middle circuit to directly supply the cavity under the squealer, said central duct extending in the radial spanwise direction, and
• wherein at least part of the first elbow is located between the cavity under the squealer and the lower surface wall, and wherein the third duct has an end which ends at the tip wall.

A ceramic core for the manufacture of a turbine blade of a turbomachine, intended to be mounted around an axis of rotation on a rotor disc rotating around the axis of rotation, said turbine blade comprising a root for mounting it in a cell of the disc, and a hollow vane extending from the root in a radial spanwise direction ending in a tip forming a squealer, the vane comprising a lower surface wall and an upper surface wall, as well as a leading edge, a trailing edge and a tip wall delimiting a bottom of the squealer, and by which the lower surface wall is connected to the upper surface wall, this core comprising:

• a core element to form a trombone type middle circuit, including a first duct configured to collect air at the root and which is connected by a first elbow to a second duct which is connected by a second elbow to a third duct these first second and third ducts extending in the radial spanwise direction, the second and third ducts being located between the first duct and the trailing edge;
• another core element to form a cavity under the squealer located on a side of the upper surface wall and the tip wall and which extends along the tip to the trailing edge, as well as a central duct extending laterally between the upper surface wall and the trombone type middle circuit, this central duct configured to collect air at the root and extend between at least two of the three ducts of the trombone type middle circuit and directly supply the cavity under the squealer, said central duct extending in the radial spanwise direction, and
• wherein at least part of the first elbow and one end of the third duct are located between the cavity under the squealer and the lower surface wall.

A ceramic core for the manufacture of a turbine blade of a turbomachine, intended to be mounted around an axis of rotation on a rotor disc rotating around the axis of rotation, said turbine blade comprising a root for mounting it in a cell of the disc, and a hollow vane extending from the root in a radial spanwise direction ending in a tip forming a squealer, the vane comprising a lower surface wall and an upper surface wall, as well as a leading edge, a trailing edge and a tip wall delimiting a bottom of the squealer, and by which the lower surface wall is connected to the upper surface wall, this core comprising:

• a core element to form a trombone type middle circuit, including a first duct configured to collect air at the root and which is connected by a first elbow to a second duct which is connected by a second elbow to a third duct these first second and third ducts extending in the radial spanwise direction, the second and third ducts being located between the first duct and the trailing edge;
• another core element to form a cavity under the squealer located on a side of the upper surface wall and the tip wall and which extends along the tip to the trailing edge, as well as a central duct extending laterally between the upper surface wall and the trombone type middle circuit, this central duct configured to collect air at the root and extend between at least two of the three ducts of the trombone type middle circuit and directly supply the cavity under the squealer, said central duct extending in the radial spanwise direction, and
• wherein at least part of the first elbow is located between the cavity under the squealer and the lower surface wall, and wherein the third duct has an end which ends at the tip wall.