Definition
Stationary blades inside the compressor section of an axial-flow turbine engine whose angle can be changed in flight to direct airflow onto the rotating compressor blades at the most efficient angle across a wide range of engine speeds and operating conditions.
Plain English
Fixed blades inside the engine that can pivot to guide incoming air onto the spinning blades at the right angle, helping the engine run smoothly whether it's idling or at full power.
Context Anchor
Seen in turbine engine systems, especially when studying axial-flow compressors, engine acceleration, and compressor stall prevention.
Derivation
Stator comes from the Latin 'stare', meaning 'to stand' -- these vanes stand still while the rotor blades spin. 'Variable-angle' simply means the angle they stand at can be adjusted.
Why Pilots Care
Proper operation prevents compressor stall and surge, protecting engine reliability and thrust output during acceleration and high-power phases of flight.
Analogy
They work a little like adjustable window blinds. The blinds do not move air themselves, but changing their angle changes the direction the air or light can pass through.
Intuition Check
Do not assume “stator” means the part never moves at all. The vanes are stationary in the sense that they do not spin around the engine shaft, but their angle can still change.
Example Sentence 1
As the pilot advanced the throttle, the variable-angle stator vanes shifted to keep airflow lined up with the compressor blades.
Example Sentence 2
As RPM increases, the vanes automatically open to maintain stable airflow and avoid compressor stall.