Definition
A ring of stationary, contoured vanes located at the entrance to each turbine wheel in a gas turbine engine. The nozzle accelerates the hot exhaust gases coming from the combustion section and directs them onto the turbine blades at the correct angle to produce maximum rotational force.
Plain English
A fixed ring of curved blades that speeds up and aims the hot gas onto the spinning turbine wheel behind it.
Context Anchor
Seen in turbine engine powerplant study, especially when learning how hot gas moves from the burner area into the turbine section.
Derivation
‘Nozzle’ comes from ‘nose,’ originally meaning a small spout or opening that shapes a flow. In a turbine, the nozzle shapes and speeds up the gas flow before it hits the turbine blades.
Why Pilots Care
Proper nozzle function ensures maximum energy extraction from the gases, directly affecting engine thrust, fuel efficiency, and reliability.
Analogy
Think of how you angle and squeeze the end of a garden hose to make the water shoot out faster and in a chosen direction. The turbine nozzle does the same thing to hot gas, aiming it precisely at the turbine blades.
Intuition Check
A turbine nozzle is not the same as a fuel nozzle. A fuel nozzle sprays fuel; a turbine nozzle guides hot gas toward the turbine blades.
Example Sentence 1
During inspection, the technician checked the turbine nozzle vanes for cracks and erosion before reinstalling the turbine wheel.
Example Sentence 2
During inspection the technician looked for cracks in the turbine nozzle caused by prolonged heat exposure.