Definition 1 of 2
Definition
In a turbocharger, the compressor is the rotating impeller that draws in ambient air and squeezes it to a higher pressure before delivering it to the engine's induction system. It is mounted on a shared shaft with the turbine, which is driven by exhaust gases; the turbine spins the compressor, and the compressor pressurizes the intake air so the engine can produce sea-level power at higher altitudes.
Plain English
The part of a turbocharger that packs air tightly together and pushes it into the engine, so the engine still gets enough air to make full power when flying high.
Context Anchor
Seen in turbocharging discussions, especially when learning how a turbocharged engine maintains power at higher altitudes.
Derivation
From Latin 'comprimere', meaning 'to press together'. That is exactly what this component does: it presses air molecules closer together, raising the pressure of the air going into the engine.
Why Pilots Care
It enables the engine to produce sea-level power at higher altitudes, improving climb performance, cruise speed, and the ability to fly over terrain or weather.
Analogy
A compressor is like a pump that squeezes air before sending it forward. In a turbocharged engine, that squeezed air helps the engine breathe better where the outside air is thinner.
Intuition Check
Do not think of the compressor as the whole turbocharger. It is one side of the turbocharger: the side that compresses the air going into the engine.
Example Sentence 1
As the airplane climbed through 10,000 feet, the turbocharger's compressor kept the intake air pressure high enough to maintain full engine power.
Example Sentence 2
During the descent the pilot monitored turbine inlet temperature to protect the compressor from excessive heat.