Blade for a turbine engine, associated turbine engine distributor and turbine engine
A blade for a turbomachine intended to be disposed about an axis while extending radially between a radially outer end and a radially inner end, the blade having at least one cooling cavity opening out to the radially outer end of the blade and to the radially inner end of the blade, the blade having at least a first tubular liner and at least a second tubular liner each engaged in the cavity, the radially outer end of the first liner opening out to the radially outer end of the blade, and the radially inner end of the second liner opening out to the radially inner end of the blade.
1. A blade for a turbomachine configured to be disposed about an axis and to extend radially between a radially outer end and a radially inner end, the blade comprising at least one cooling cavity opening out to the radially outer end of the blade and to the radially inner end of the blade, the blade comprising at least a first tubular liner and at least a second tubular liner each engaged in the cavity, the radially outer end of the first liner opening out to the radially outer end of the blade, and the radially inner end of the second liner opening out to the radially inner end of the blade, the blade having a camber such that a central axis of said blade has a radius of curvature between 30 mm and 100 mm, wherein the central axis is a mean camber line of a leading edge and a trailing edge.
2. The blade according to claim 1 , wherein the radially outer end of the first liner is a first end fixed on the radially outer end of the blade, and the radially inner end of the second liner is a first end fixed on the radially inner end of the blade, the first liner and the second liner each further comprising a second free end, the second free ends of the first and second liners facing each other in the cavity for cooling the blade.
3. The blade according to claim 2 , wherein the first end of each liner comprises an end flange bearing on a respective end of the blade, each flange being welded or brazed to said respective end.
4. The blade according to claim 2 , wherein, along a direction radial to the axis, a height of the first liner is different from a height of the second liner between the first end and the second end of said liners, the height of each liner being less than 70%, of the height of the cavity in which said liners are engaged.
5. The blade according to claim 2 , wherein the second end of each liner comprises a bottom wall, a distance between the bottom walls of each of the liners being less than 10 mm.
6. The blade according to claim 2 , wherein the second end of one of the first and the second liner comprises a protrusion protruding from said second end, the second end of the other of the first and second liner comprising an orifice, the protrusion being configured to be inserted into the orifice.
7. The blade according to claim 1 , wherein the blade comprises a leading edge cavity and a trailing edge cavity separated from the leading edge cavity by a wall, each of these cavities opening out on the radially inner and outer ends of the blade, a first leading edge liner and a first trailing edge liner being engaged respectively in the leading edge and the trailing edge cavity, and a second leading edge liner and a second trailing edge liner being engaged respectively in the leading edge and the trailing edge cavity.
8. A nozzle for a turbomachine, the nozzle being configured to be disposed about an axis and to extend radially between a radially inner platform and a radially outer platform, each platform comprising a flowpath face configured to delimit a fluid flow channel and an end face opposite to the flowpath face, the nozzle comprising at least one blade according to claim 1 , the at least one cavity for cooling the blade opening out on the end face of the radially inner platform and on the end face of the radially outer platform, the radially outer end of the first liner opening out on the end face of the radially outer platform, and the radially inner end of the second liner opening out on the end face of the radially inner platform.
9. A turbomachine comprising the nozzle according to claim 8 .
10. The blade according to claim 2 , wherein, along a direction radial to the axis, a height of the first liner is different from a height of the second liner, the height of each liner being less than 60% of the height of the cavity in which said liners are engaged.
11. The blade according to claim 2 , wherein, along a direction radial to the axis, a height of the first liner is different from a height of the second liner, the height of each liner being less than 50% of the height of the cavity in which said liners are engaged.
12. The blade according to claim 1 , wherein the blade comprises a leading edge which is convex with respect to a straight radial direction of the blade, and a trailing edge which is concave with respect to said radial direction.
13. The blade according to claim 7 , wherein the wall extends along a whole height of the blade.