Definition
In a multi-spool turbine engine, the high pressure compressor is the rear compressor section that receives air already partially compressed by the low pressure compressor and squeezes it further to the high pressures needed for efficient combustion. It is driven by its own turbine through an inner shaft and rotates independently of, and usually faster than, the low pressure compressor.
Plain English
The second stage of squeezing the air inside a turbine engine. Air comes in, gets a first squeeze from the low pressure compressor, then enters the high pressure compressor where it is squeezed much more before being burned with fuel.
Context Anchor
Seen in turbine engine instrument discussions, especially when reading high-pressure rotor speed indications during engine start, power changes, or engine monitoring.
Derivation
Compressor comes from Latin words meaning “to press together.” That fits the aviation use: this part of the engine presses incoming air into a smaller space, raising its pressure before combustion.
Why Pilots Care
Its performance directly affects engine thrust, fuel efficiency, and resistance to compressor stall or surge, which can reduce power or damage the engine.
Analogy
Think of it like the final stage of a bicycle pump stroke: the air is already moving inward, but the last squeeze raises the pressure enough to make it useful.
Intuition Check
“High pressure” does not mean this is a pressure gauge or a cockpit setting. Here it names the compressor section that works at the higher-pressure end of the engine, just before combustion.
Example Sentence 1
As the pilot advanced the throttles, the high pressure compressor accelerated first, shown by N2 rising ahead of N1.
Example Sentence 2
A sudden drop in compressor discharge pressure indicated a possible issue in the high pressure compressor during climb.