Definition
Stationary, curved blades fitted inside a turbine engine, turbocharger, or similar airflow device that redirect the flow of air or gas onto the rotating blades at the correct angle. Guide vanes do not move with the rotor; they shape and aim the flow so that the rotating stage receives it efficiently.
Plain English
Fixed blades inside an engine or pump that steer the air or gas so it hits the spinning blades at the right angle.
Context Anchor
Seen in turbine engine descriptions, especially when discussing compressors, turbines, and engine airflow.
Derivation
From the verb 'guide' (to direct) and 'vane' (a flat or curved blade that interacts with moving air or fluid). The name describes the job exactly: blades that guide the flow.
Why Pilots Care
Properly functioning guide vanes maintain smooth airflow, protect against compressor stalls, and keep engine thrust and fuel efficiency within safe limits.
Intuition Check
Guide vanes are not the same as spinning fan or turbine blades. They mainly aim and smooth the flow; the rotating blades do the spinning work.
Example Sentence 1
The inspector checked the inlet guide vanes for cracks before returning the engine to service.
Example Sentence 2
During high power settings the variable guide vanes automatically adjust to keep airflow stable inside the compressor.