DOC AIRBUS | AMM A320FHP TURBINE COOLING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
A. HP Turbine Cooling Make-up Air System
SBE 75-0081
A cooling system is provided to supply supplemental air to cool the stage 2 turbine blades and HP 1 turbine disk bores during all power settings.
The source of this air is 10th stage compressor bleed. This air is supplied to the diffuser case through a continuous flow adapter mounted on the HP compressor case and two external pipes which connect to the adapter. The pipes pass through two diffuser case struts into the diffuser case internal cavity. Here the air mixes with air from various sources and continues through internal cavities to the stage two blades and HP 1 turbine disk bores.
SBE 75-0081
A cooling system is provided to supply supplemental air to cool the stage 2 turbine blades and HP 1 turbine disk bores during all power settings.
HP Turbine Cooling Controlled Air systemThe source of this air is 10th stage compressor bleed. This air is supplied to the diffuser case through a continuous flow adapter mounted on the HP compressor case and two external pipes which connect to the adapter. The pipes pass through two diffuser case struts into the diffuser case internal cavity. Here the air mixes with air from various sources and continues through internal cavities to the stage two blades and HP 1 turbine disk bores.
B. Description
Pre SBE 75-0081
Pre SBE 75-0081
(1) General
The HP turbine cooling controlled air system consists of:
The HP turbine cooling controlled air system consists of:
- a control valve
- a valve solenoid (controlled by EEC)
- 2 tubes
(2) Control Valve
The external piping incorporates a cooling air control valve which is either fully closed or fully open. The valve is operated by a solenoid valve controlled in response to EEC signals. The control valve is normally open.
A visual position indicator on the valve is provided for maintenance purposes. It also incorporates 2 position indication switches to provide a signal to the EEC (channels A and B) for fault detection purposes.
The external piping incorporates a cooling air control valve which is either fully closed or fully open. The valve is operated by a solenoid valve controlled in response to EEC signals. The control valve is normally open.
A visual position indicator on the valve is provided for maintenance purposes. It also incorporates 2 position indication switches to provide a signal to the EEC (channels A and B) for fault detection purposes.
(3) Solenoid valve
The solenoid valve is mounted on the fan case.
It is energized/de-energized in response to EEC signals. When energized the solenoid supplies high pressure compressor discharge air to the control valve which shuts-off the flow of cooling air.
De-energizing the solenoid opens the control valve allowing full cooling air flow.
Scheduling by the EEC is a function of high rotor speed and altitude.
The solenoid valve is mounted on the fan case.
It is energized/de-energized in response to EEC signals. When energized the solenoid supplies high pressure compressor discharge air to the control valve which shuts-off the flow of cooling air.
De-energizing the solenoid opens the control valve allowing full cooling air flow.
Scheduling by the EEC is a function of high rotor speed and altitude.
C. Description
SBE 75-0081
SBE 75-0081
(1) General
The HP turbine cooling air system consists of:
The HP turbine cooling air system consists of:
- a continuous flow adpater
- 2 tubes
(2) Continuous flow adpater
The external piping incorporates a continuous flow adapter which supplies a continuous flow of cooling air to the turbine.
The external piping incorporates a continuous flow adapter which supplies a continuous flow of cooling air to the turbine.
2. HP Turbine Cooling System
This system is used to cool the HP turbine case, various non-rotating parts within the case, the LP turbine support rails for the diffuser duct outer segments and the stage 2 vanes. The source of this air is 10th stage compressor bleed. Four external pipes carry equal cooling air flow from four locations on the HP compressor case to four locations on the HP turbine case.
This system is used to cool the HP turbine case, various non-rotating parts within the case, the LP turbine support rails for the diffuser duct outer segments and the stage 2 vanes. The source of this air is 10th stage compressor bleed. Four external pipes carry equal cooling air flow from four locations on the HP compressor case to four locations on the HP turbine case.