Cooling arrangement for a component of a gas turbine engine
AssigneeROLLS-ROYCE plc
InventorIan Tibbott
Life of this patent
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Abstract
A component, such as a blade, vane or combustor wall of a gas turbine engine comprises two walls defining a coolant passage and has an array of pedestals extending between the two walls for heat removal. Each pedestal changes in cross-section along its length. Alternate rows of pedestals are arranged such that their larger cross-sectional area is adjacent one wall then the other. When a coolant flows through the passage it is forced to flow between one wall and the other wall so as to increase turbulence and hence mixing for a more even coolant temperature. The array of pedestals can also be used to tailor the individual heat loads on each wall independently and has the ability to use differing levels of blockage to counter adverse pressure gradients along successive rows of pedestals.
Claims20
A component for a gas turbine engine comprising a first wall and a second wall defining a coolant passage and an array of pedestals extending between the first wall and the second wall wherein at least one pedestal changes in cross-section between the first wall and the second wall, the pedestal(s) includes a first part having a first cross-sectional area and a second part having a second cross sectional area, and the first part and the second part are aligned at a common trailing edge.
A component for a gas turbine engine comprising a first wall and a second wall defining a coolant passage and an array of pedestals extending between the first wall and the second wall wherein at least one pedestal changes in cross-section between the first wall and the second wall, and in a first row of pedestals at least two of the pedestals alternate between having their greater cross sectional area adjacent the first wall and their smaller cross sectional area adjacent the first wall.
A component for a gas turbine engine comprising a first wall and a second wall defining a coolant passage and an array of pedestals extending between the first wall and the second wall wherein at least one pedestal changes in cross-section between the first wall and the second wall, two parts of each pedestal are selected from the group comprising the cross-sectional shapes of circular, triangular, rectangular, diamond, parallelepiped and ellipse, and the two parts have different cross-sectional shapes.
Dependencies are inferred from the claim text.