Definition
The core section of a turboprop or turbine engine that produces a continuous flow of hot, high-energy gas. It consists of the compressor, combustion chamber, and the turbine stage that drives the compressor. Its sole job is to generate the energetic gas stream that then drives the power turbine and, through reduction gearing, the propeller.
Plain English
The part of a turbine engine that takes in air, compresses it, burns fuel with it, and produces a hot stream of gas. That gas stream is what the rest of the engine uses to make power.
Context Anchor
Seen in turboprop engine descriptions, especially when explaining how the engine core supplies power to the propeller-driving section.
Derivation
The name is literal: this section of the engine generates the working gas. Calling it a 'generator' highlights that it doesn't directly produce thrust or shaft power for the propeller -- it produces the gas that does.
Why Pilots Care
Pilots monitor gas generator performance to manage power output and respond correctly to engine issues during flight.
Intuition Check
Do not think of a gas generator as a device that makes gasoline or electricity. In this context, it is the engine core that produces hot gas energy for a turboprop engine.
Example Sentence 1
During start, the pilot monitors gas generator RPM to confirm it reaches the minimum speed before introducing fuel.
Example Sentence 2
A drop in gas generator speed during cruise indicates a potential problem with fuel flow or compressor efficiency.