DOC AIRBUS | AMM A320FHPC FRONT STATOR ASSEMBLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The compressor front stator consists of the front casing halves, the inlet guide vanes (IGV), and the first 5 stages of stator vanes.
** ON A/C NOT FOR ALL The compressor front stator consists of the front casing halves, the inlet guide vanes (IGV), and the first 5 stages of stator vanes.
2. Description
Compressor Front Stator AssemblyA. Front Stator Casing
The front case halves are made from M152 steel forging. The stage 1-5 flowpath is a machined, integral part of the case, instead of liners. The lower halves of the front casing have ports for the inspection of the internal areas. The front stator forms the load carrying structure between the fan frame and the combustion case. Bleed air is taken from the pads on the front case for the use of the customer. The bleed air is also used for high pressure turbine cooling and clearance control and for low pressure turbine cooling.
The front case halves are made from M152 steel forging. The stage 1-5 flowpath is a machined, integral part of the case, instead of liners. The lower halves of the front casing have ports for the inspection of the internal areas. The front stator forms the load carrying structure between the fan frame and the combustion case. Bleed air is taken from the pads on the front case for the use of the customer. The bleed air is also used for high pressure turbine cooling and clearance control and for low pressure turbine cooling.
B. Vanes
The IGV and the stages 1 through 3 vanes are variable ; the stages 4 and 5 vanes are fixed. All vanes are made of steel.
The fixed vanes, in stages 4 and 5, are fabricated into segments consisting of several vanes each. All stages of vanes have honeycomb shrouds on their inner diameter. The shrouds together with the rotor seal teeth, form interstage seals to prevent flowpath recirculation.
The IGV and the stages 1 through 3 vanes are variable ; the stages 4 and 5 vanes are fixed. All vanes are made of steel.
The fixed vanes, in stages 4 and 5, are fabricated into segments consisting of several vanes each. All stages of vanes have honeycomb shrouds on their inner diameter. The shrouds together with the rotor seal teeth, form interstage seals to prevent flowpath recirculation.
C. Variable Vane Actuation
Actuation of the variable vanes is accomplished with hydraulically actuated bellcrank assemblies mounted on the front compressor stator at the 2 and 8 o'clock positions.
Fixed linkages connect the bellcranks to actuation rings.
Lever arms attached to the variable vanes connect to the actuation rings.
Fuel from the hydromechanical unit (HMU) operates the hydraulic actuators.
Actuation of the variable vanes is accomplished with hydraulically actuated bellcrank assemblies mounted on the front compressor stator at the 2 and 8 o'clock positions.
Fixed linkages connect the bellcranks to actuation rings.
Lever arms attached to the variable vanes connect to the actuation rings.
Fuel from the hydromechanical unit (HMU) operates the hydraulic actuators.