DOC AIRBUS | AMM A320FCOMPRESSOR CONTROL - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The booster stage bleed valve, the variable stator vane and HP compressor bleed valves systems are controlled by the EEC.
The booster stage bleed valve controls the LP compressor airflow.
The variable stator vane and the 7th and 10th stage bleed valves control the HP compressor airflow.
** ON A/C NOT FOR ALL The booster stage bleed valve, the variable stator vane and HP compressor bleed valves systems are controlled by the EEC.
The booster stage bleed valve controls the LP compressor airflow.
The variable stator vane and the 7th and 10th stage bleed valves control the HP compressor airflow.
2. Variable Stator Vane System (VSV)
The VSV system maintains a satisfactory compressor performance over a wide range of operating conditions. The system varies the angle of the inlet guide vanes and stator vanes to aerodynamically match the low pressure stages of compression with the high pressure stages. This variation of vane position changes the effective angle at which the air flows across the compressor blades and vanes. The VSV angle determines the compression characteristics (direction and velocity) for any particular stage at compression.
** ON A/C NOT FOR ALL The VSV system maintains a satisfactory compressor performance over a wide range of operating conditions. The system varies the angle of the inlet guide vanes and stator vanes to aerodynamically match the low pressure stages of compression with the high pressure stages. This variation of vane position changes the effective angle at which the air flows across the compressor blades and vanes. The VSV angle determines the compression characteristics (direction and velocity) for any particular stage at compression.
3. Booster Stage Bleed Valve
At low LP spool speeds the booster provides more air than the core engine can utilize. To match the booster discharge airflow to the core engine requirements at low speed, excess air is bled off through booster stage bleed valves (BSBV) into the fan discharge air stream. At higher engine speeds the BSBV are closed so that all the booster discharge (primary air flow) enters the core engine.
** ON A/C NOT FOR ALL At low LP spool speeds the booster provides more air than the core engine can utilize. To match the booster discharge airflow to the core engine requirements at low speed, excess air is bled off through booster stage bleed valves (BSBV) into the fan discharge air stream. At higher engine speeds the BSBV are closed so that all the booster discharge (primary air flow) enters the core engine.
4. HP Compressor Bleed Valves
The 7th and 10th stages bleed valves maintain a more stable operation of the compressor.
The 7th and 10th stages bleed valves maintain a more stable operation of the compressor.