Definition
In a multi-spool gas turbine engine, the high-pressure compressor is the rear compressor section that receives air already partially compressed by the low-pressure compressor and raises it to the much higher pressure required for combustion. It is driven by the high-pressure turbine through its own shaft, and together with that turbine forms the high-pressure spool, which rotates independently of the low-pressure spool.
Plain English
It is the second, faster-spinning compressor in a turbine engine. It takes air that has already been squeezed once by the front compressor and squeezes it much harder before sending it into the combustion chamber.
Context Anchor
Seen in turbine engine descriptions, maintenance inspections, engine cutaway diagrams, and discussions of compressor damage or engine performance problems.
Derivation
Compressor comes from Latin roots meaning “to press together.” That helps because this part of the engine works by pressing air into a smaller space, which raises its pressure before fuel is burned.
Why Pilots Care
Proper function delivers the high pressure needed for full engine thrust and stable operation.
Analogy
Think of it like a second, stronger squeeze after the air has already been partly squeezed. The engine first raises the air pressure, then the high-pressure compressor raises it much more before combustion.
Intuition Check
High-pressure compressor does not mean any compressor that happens to make high pressure. In a turbine engine, it means a specific compressor section near the combustion section that makes the final major pressure increase before fuel is burned.
Example Sentence 1
After the low-pressure compressor boosts the incoming air, the high-pressure compressor squeezes it further before it enters the combustion chamber.
Example Sentence 2
Maintenance replaced a damaged blade in the high-pressure compressor before the next flight.