DOC AIRBUS | AMM A320FTURBINE VANE AND BLADE COOLING (TVBC) - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
A. The Turbine Cooling Air (TCA) system supplies a continuous flow of cooling air to the High Pressure Turbine (HPT) 2nd stage vanes, the inter-stage HPT cavity, the Turbine Intermediate Case (TIC) stator vanes, the Low Pressure Turbine (LPT) case outer cavity, and the LPT rotor inter-stage cavities.
Turbine Cooling Air (TCA) System2. System Description
A. TCA System
(1) The TCA system supplies a continuous flow of cooling air to the HPT 2nd stage vanes, the inter-stage HPT cavity, the TIC stator vanes (which include Outside Diameter (OD) and Inside Diameter (ID) cavities), the LPT case outer cavity, and the LPT rotor inter-stage cavities.
(2) The TCA system has four HPT cooling air tubes. The TIC/LPT has four main TCA tubes, eight TIC jumper air tubes and three jumper air tubes that supply air to the LPT case.
(a) HPT Cooling Air
1 The HPT TCA system supplies continuous flow of 6th stage bleed air to the HPT 2nd stage vanes for cooling.
2 The HPT TCA system has four TCA air tubes that are installed approximately 90 degrees apart on the engine core.
3 This air is controlled by plates which are located between the HPT case and the TCA tubes.
4 The cooling air flows into the hollow vanes and through passages that go out of the trailing edge of the vanes and on the inner and outer platforms.
5 Cooling air is also supplied through the vanes to the inter-stage HPT cavity.
(b) TIC/LPT Cooling Air
1 The TIC/LPT TCA tubes supply continuous flow of HPC 3rd stage bleed air to the TIC and LPT case for cooling.
2 This air cools the TIC fairings and the inner and outer TIC walls.
3 Cooling air flows to the TIC through TIC jumper tubes (eight each) located on the HPT case.
4 This air is controlled by plates located between the TIC and the jumper tubes.
5 There are an additional three jumper tubes connected to the TIC/LPT TCA tubes. These tubes supply cooling air to the LPT outer case.
6 This air is also controlled by plates located between the LPT case and the LPT TCA jumper tubes.