Cooling apparatus for a mid-turbine frame

A cooling apparatus that bifurcates and regulates cooling airflow provided to a mid-turbine frame, the cooling apparatus comprising:

• a flow metering tube having a top portion and a tube portion, wherein the top portion includes a first central aperture that directs a first cooling airflow into the tube portion and a first plurality of apertures located circumferentially around the first central aperture that directs a second cooling airflow to a portion outside the tube portion;
• and
• a metering plate located on the top portion of the flow metering tube, wherein the metering plate includes a second central aperture aligned with the first central aperture of the flow metering tube and a second plurality of apertures located circumferentially around the second central aperture, wherein a size of the second central aperture meters the first cooling airflow and a size and number of the second plurality of apertures meters the second cooling airflow;
• wherein the top portion of the flow metering tube includes a plurality of gaps on an outer diameter, and the metering plate includes a plurality of tabs on an outer diameter, wherein the metering plate is prevented from rotating by engaging the plurality of tabs within the plurality of gaps.

A cooling system for a mid-turbine frame, the cooling system comprising:

• an outer case;
• an inner hub;
• a hollow cooling rod that extends from the inner hub to the outer case;
• a fastener that mechanically attaches the hollow cooling rod to the outer case and has a hollow portion and side apertures located on a side portion of the fastener for delivering cooling airflow to a portion adjacent the outer case;
• a flow metering tube positioned within the hollow portion of the fastener, the flow metering tube having a top portion and a tube portion that is coupled with the hollow cooling rod, wherein the top portion includes a first central aperture that directs a first cooling airflow into the tube portion for supply to the hollow cooling rod and an inner diameter location, and a first plurality of apertures located circumferentially around the first central aperture that directs a second cooling airflow to the hollow portion of the fastener for supply via the side apertures to the portion adjacent the outer case;
• and
• a metering plate located on the top portion of the flow metering tube, wherein the metering plate includes a second central aperture aligned with the first central aperture of the flow metering tube and a second plurality of apertures located circumferentially around the second central aperture, wherein a size of the second central aperture meters the first cooling airflow and a size and number of the second plurality of apertures meters the second cooling airflow.