Cooling System with a Bearing Compartment Bypass

摘要

A cooling system for providing a buffer cooled cooling air to a turbine section of a gas turbine engine is disclosed. The cooling system may comprise a first conduit configured to transmit a cooling air toward the turbine section, a heat exchanger configured to cool a bleed airflow diverted from the first conduit to provide a buffer air, and a bypass conduit configured to direct at least a portion of the buffer air through at least one passageway that bypasses a bearing compartment of the gas turbine engine. The cooling system may further comprise a manifold configured to allow the cooling air exiting the first conduit and the buffer air exiting the bypass conduit to mix and provide the buffer cooled cooling air, and a nozzle assembly configured to deliver the buffer cooled cooling air to the turbine section.

主权项

1. A method for providing cooling air to a turbine section of a gas turbine engine having a bearing compartment located radially inward of a diffuser case, comprising:
routing a cooling air toward the turbine section through a first conduit; diverting a bleed airflow from the first conduit through a heat exchanger; cooling the bleed airflow in the heat exchanger to provide a buffer air; routing at least a portion of the buffer air through a bypass conduit that bypasses the bearing compartment; mixing the buffer air exiting the bypass conduit with the cooling air exiting the first conduit to provide a buffer cooled cooling air; and delivering the buffer cooled cooling air to the turbine section.