Definition 1 of 2
Definition
In a gas turbine engine, compression is the stage in which incoming air is squeezed into a smaller volume by the compressor, raising its pressure and temperature before it enters the combustion section. This pressurized air is what allows fuel to burn efficiently and produce the high-energy gas flow that drives the turbine and generates thrust.
Plain English
Compression is the squeezing of air into a smaller space so its pressure and temperature go up. In a jet engine, this happens before fuel is added and burned.
Context Anchor
Seen when studying the basic airflow path through a gas turbine engine: air intake, compression, burning, and exhaust.
Derivation
From the Latin 'comprimere,' meaning 'to press together.' That meaning carries straight into aviation: air is literally pressed together into a smaller volume.
Why Pilots Care
Adequate compression determines engine efficiency, thrust output, and resistance to stalls or surges during flight.
Analogy
It is similar to a bicycle pump: as the pump handle moves in, the air inside is squeezed and its pressure rises.
Grounding Statement
Picture air being forced through a series of fan-like blades, each one packing it tighter than the last, so by the time it reaches the burner it is hot and under high pressure.
Intuition Check
Compression does not mean just any squeezing or pressure in the airplane. Here it means raising the pressure of the air flowing through a gas turbine engine before the fuel-burning part of the engine.
Example Sentence 1
After the air enters the inlet, the compressor performs the compression stage before delivering the air to the combustion chamber.
Example Sentence 2
Insufficient compression during high-altitude flight can reduce thrust and increase the risk of engine surge.