Definition
The central rotating disk or assembly of disks in the compressor section of a turbine engine to which the compressor blades are attached. The hub mounts on the main engine shaft and carries the blades through the airstream, compressing the air as it passes through successive stages.
Plain English
The spinning core piece in the front section of a jet engine that holds all the small fan-like blades and turns them to squeeze the incoming air.
Context Anchor
Seen in turbine engine maintenance, compressor inspection, and discussions of compressor rotor damage or blade attachment.
Derivation
Compressor' comes from Latin comprimere, meaning 'to press together' — the part of the engine that squeezes air. 'Hub' is an old English word for the central part of a wheel that the spokes attach to. Put them together and you have the central piece that carries the air-squeezing blades.
Why Pilots Care
Damage or imbalance here can cause engine vibration, reduced performance, or failure in turbine-powered aircraft.
Analogy
Think of a bicycle wheel: the spokes attach to the center hub. In a compressor, the blades are carried by the central hub as the assembly spins.
Intuition Check
Do not think of the compressor hub as the whole compressor. It is the central supporting part that carries the blades.
Example Sentence 1
During the overhaul, the technician inspected the compressor hub for cracks before reinstalling the blades.
Example Sentence 2
A balanced compressor hub prevents damaging vibration throughout the turbine section.