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A multi-stage intercooled compressor for a gas turbine engine, including multiple stages of rotating blades and cooling stator vanes, a cooling stator vane including an outer wall that defines an internal coolant fluid passage and has a length along a centerline from a leading edge to a trailing edg

A multi-stage intercooled compressor for a gas turbine engine, including multiple stages of rotating blades and cooling stator vanes, a cooling stator vane including an outer wall that defines an internal coolant fluid passage and has a length along a centerline from a leading edge to a trailing edge of the outer wall, and an internal flow divider wall disposed within the internal passage and extending along the centerline to divide the internal coolant fluid passage into an inflow pathway and an outflow pathway.

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1. A multi-stage intercooled compressor for a gas turbine engine, including multiple stages of rotating blades and cooling stator vanes, the cooling stator vane including an outer wall that defines an internal coolant fluid passage and has a length along a centerline from a leading edge to a trailin

1. A multi-stage intercooled compressor for a gas turbine engine, including multiple stages of rotating blades and cooling stator vanes, the cooling stator vane including an outer wall that defines an internal coolant fluid passage and has a length along a centerline from a leading edge to a trailing edge of the outer wall, and an internal flow divider wall disposed within the internal passage and extending along the centerline to divide the internal coolant fluid passage into an inflow pathway and an outflow pathway; wherein the multi-stage intercooled compressor includes an outer casing, wherein the outer wall includes a first outer wall and a second outer wall that are connected at the leading edge, the trailing edge and the distal end of the outer wall, and a base end attached to the outer casing, wherein the cooling vane further includes a coolant input connection and a coolant output connection, each extending through the outer casing to provide fluid communication between the internal coolant fluid passage and a coolant condensation and pumping system, and wherein the internal flow divider wall has a base end attached to the outer casing between the coolant input connection and the coolant output connection, and a distal end, and the internal coolant fluid passage is divided into an inflow pathway disposed between the internal flow divider wall and an interior surface of the first outer wall, and an outflow pathway disposed between the internal flow divider wall and the interior surface of the second outer wall, and wherein the distal end of the internal flow divider wall extends toward the distal end of the outer wall with a passage for a coolant fluid to pass around the distal edge of the internal flow divider wall from the inflow pathway to the outflow pathway. 2. The multi-stage intercooled compressor of claim 1, wherein the outer surface of the stator vane is substantially free of an extending cooling fin. 3. The multi-stage intercooled compressor of claim 1, wherein a surface area of an interior surface of the outer wall, exposed to cooling fluid, is at least about 90% of a surface area of an outer surface of the outer wall, exposed to compression air. 4. The multi-stage intercooled compressor of claim 1, wherein a leading edge of the internal flow divider wall is connected to the leading edge of the outer wall, and a trailing edge of the internal flow divider wall is connected to the trailing edge of the outer wall. 5. The multi-stage intercooled compressor of claim 1, wherein an outer surface of the internal flow divider wall is completely separated from an interior surface of the outer wall. 6. The multi-stage intercooled compressor of claim 5, wherein the outer surface of the internal flow divider wall and the interior surface of the outer wall are connected with one or more support members. 7. The multi-stage intercooled compressor of claim 1, wherein the outer wall includes a first outer wall and a second outer wall that are connected at their respective leading edges and trailing edges, and an interior surface of the first outer wall and an interior surface of the second outer wall define the internal coolant fluid passage, and wherein the inflow pathway is disposed between the internal flow divider wall and the interior surface of the first outer wall, and the outflow pathway is disposed between the internal flow divider wall and the interior surface of the second outer wall. 8. multi-stage intercooled compressor of claim 1, wherein the outer wall has no openings therethrough from the inside surface to the outside surface, and a cooling fluid recirculated through the internal coolant fluid passage is not in fluid communication with compression air on the outside surface of the outer wall. 9. A cooling stator vane including an outer wall that defines an internal coolant fluid passage and has a length along a centerline from a leading edge to a trailing edge of the outer wall, and an internal flow divider wall disposed within the internal passage and extending along the centerline to divide the internal coolant fluid passage into an inflow pathway and an outflow path; wherein the outer wall includes a first outer wall and a second outer wall that are connected at the leading edge, the trailing edge and the distal end of the outer wall, a base end configured to attach to portion of an outer casing of a multi-stage intercooled compressor, and a distal end, wherein the cooling stator vane further includes a coolant input connection and a coolant output connection, each extending through the outer casing to provide fluid communication with the internal coolant fluid passage, and wherein the internal flow divider wall has a base end configured to attached to the outer casing between the coolant input connection and the coolant output connection, and a distal end, wherein the inflow pathway is disposed between the internal flow divider wall and an interior surface of the first outer wall, and the outflow pathway is disposed between the internal flow divider wall and the interior surface of the second outer wall, and wherein the distal end of the internal flow divider wall extends toward the distal end of the outer wall with a passage for a coolant fluid to pass around the distal edge of the internal flow divider wall, from the inflow pathway to the outflow pathway. 10. The cooling stator vane of claim 9, wherein the outer surface. of the stator vane is substantially free of an extending cooling fin. 11. The cooling stator vane of claim 9, wherein the surface area of an interior surface of the outer wall, exposed to cooling fluid, is at least about 90% of a surface area of an outer surface of the outer wall, exposed to compression air. 12. The cooling stator vane of claim 9, wherein a leading edge of the internal flow divider wall is connected to the leading edge of the outer wall, and a trailing edge of the internal flow divider wall is connected to the trailing edge of the outer wall. 13. The cooling stator vane of claim 9, wherein an outer surface of the internal flow divider wall is completely separated from an interior surface of the outer wall. 14. The cooling stator vane of claim 13, wherein the outer surface of the internal flow divider wall and the interior surface of the outer wall are connected with one or more support members. 15. The cooling stator vane of claim 9, where the outer wall includes a first outer wall and a second outer wall that are connected at their respective leading edges and trailing edges, and an interior surface of the first outer wall and an interior surface of the second outer wall define the internal coolant fluid passage, and where the inflow pathway is disposed between the internal flow divider wall and the interior surface of the first outer wall, and the outflow pathway is disposed between the internal flow divider wall and the interior surface of the second outer wall. 16. The cooling stator vane of claim 9, wherein the outer wall has no openings therethrough from the inside surface to the outside surface, and a cooling fluid recirculated through the internal coolant fluid passage is not in fluid communication with compression air on the outside surface of the outer wall. 17. A method of cooling the compressed airflow passing through a multi-stage compressor, comprising the steps of: circulating a cooling liquid into a plurality of stator vanes of one or more stages of the multi-stage compressor, and passing the cooling liquid along an interior surface of an outer wall of the stator vane, wherein the cooling liquid has a vapor point below an air temperature in the compressor, thereby increasing the effectiveness of the cooling of the airflow through the compressor, resulting in an increase in the efficiency of engine and a reduction in the engine fuel consumption. 18. A method of claim 17 wherein the cooling stator vanes do not include external cooling fins that projection into the airflow path between the stator vanes, which can increase the pressure losses in the compressor and reduces the efficiency of the compressor.