Multi-orifice plate for cooling flow control in vane cooling passage

摘要

An impingement plate for a turbine vane with an integrated cooling flow metering device is disclosed. The impingement plate—which covers the outer end of the vane and allows some cooling air to pass through to the vane's top surface—is re-designed to incorporate an orifice plate for metering the amount of cooling air flow which enters a cooling passage in the vane. The multi-hole orifice pattern in the metering device is designed to optimize the downstream airflow pattern, thus improving heat transfer from the vane to the cooling air. The reduced cooling air flow through the vane results in increased turbine engine efficiency, and the re-designed impingement plate can be used with the existing vane design.

主权项

1. A turbine vane for improving efficiency of a gas turbine engine, said turbine vane comprising:
a vane body, said body comprising a machined casting including an airfoil section with one or more internal cooling air passages including a trailing edge cooling air passage which takes a three-pass serpentine route through the turbine vane, where the machined casting has a design which is not to be changed; a thermal barrier coating (TBC) covering an exterior surface of the airfoil section, where the TBC has a thickness which reduces a maximum operating temperature in the vane body below a temperature of a surrounding combustion gas; and an impingement plate fitted to an outer end of the vane body, where the impingement plate meters a flow of cooling air onto the outer end of the vane body, and where the impingement plate includes a flow metering plate located over an inlet to the trailing edge cooling air passage, where the flow metering plate controls a cooling air flow rate at an amount sufficient to maintain the maximum operating temperature in the turbine vane below a prescribed limit value in conjunction with the thickness of the TBC.