Turbine blade tip cooling

摘要

A turbine blade includes a blade portion, the blade portion comprising a tip outer wall and a trailing edge, an internal cooling circuit, the internal cooling circuit being configured for directing cooling air within the blade portion, and a tip trailing edge slot positioned adjacent to the tip outer wall and the trailing edge, the tip trailing edge slot being fluidly connected to the internal cooling circuit. The tip outer wall is recessed at the tip trailing edge slot such that the tip outer wall is not provided over the trailing edge slot, thereby allowing cooling air to flow from the cooling circuit, into the trailing edge slot, and radially over the tip outer wall.

主权项

1. A turbine blade comprising:
a blade portion, the blade portion comprising a tip outer wall and a trailing edge; an internal cooling circuit, the internal cooling circuit being configured for directing cooling air within the blade portion; and a tip trailing edge slot comprising a lower wall and positioned adjacent to the tip outer wall and the trailing edge, the tip trailing edge slot being fluidly connected to the internal cooling circuit, wherein the internal cooling circuit comprises a channel positioned radially inward from the tip outer wall and fluidly connected to the tip trailing edge slot for providing cooling air to the tip trailing edge slot, and wherein the channel comprises a first portion and a second portion, the first portion being oriented generally parallel to the tip outer wall, the second portion being angled radially with respect to the tip outer wall for guiding the cooling air flow in the radial direction, wherein the tip trailing edge lower wall is oriented generally parallel to the first portion, wherein the second portion is positioned between the first portion and the tip trailing edge lower wall, and wherein a radially lower surface of the first portion, a radially lower surface of the second portion, and the tip trailing edge lower wall form a contiguously-and continuously-connected channel radially lower surface, and wherein the tip outer wall is recessed at the tip trailing edge slot such that the tip outer wall is not provided over the trailing edge slot, thereby allowing cooling air to flow from the cooling circuit, into the trailing edge slot, and radially over the tip outer wall.