Definition 1 of 2
Definition
A rotating disk in a turbine engine fitted around its rim with airfoil-shaped blades. Hot, high-pressure gases from the combustion section flow across these blades, causing the wheel to spin. The turbine wheel is mounted on a shaft and drives the compressor, and in some engines also drives accessories or a propeller through a reduction gearbox.
Plain English
A bladed wheel inside a jet or turboprop engine that is spun by hot exhaust gases. As it spins, it turns a shaft that powers the rest of the engine.
Context Anchor
Seen in turbine engine and turbocharger discussions, especially when learning how exhaust gas or hot engine gas is used to make parts spin.
Derivation
From the Latin turbo, meaning 'whirlwind' or 'spinning thing.' The name fits: hot gases rush past the blades and make the wheel whirl, which is exactly how the engine extracts power from the gas stream.
Why Pilots Care
Failure or damage to the turbine wheel can cause loss of engine power or complete shutdown, directly affecting flight safety and performance.
Analogy
It is a little like a pinwheel in the wind: moving air pushes the blades and makes it spin. In an engine, the push comes from hot, fast-moving gas instead of a breeze.
Intuition Check
Do not picture a tire or landing gear wheel. A turbine wheel is a bladed spinning part inside an engine or turbocharger.
Example Sentence 1
Hot gases leaving the combustion chamber spin the turbine wheel, which in turn drives the compressor at the front of the engine.
Example Sentence 2
During a hot-section inspection the turbine wheel is checked for cracks and blade erosion.