In a gas turbine engine, ignition occurs in which section?

In a gas turbine engine, ignition occurs in which section?

• A. Turbine section
• B. Combustion section
• C. Compressor section
• D. Accessory gearbox

Answer: (B)

Ignition must happen where the fuel can burn efficiently, which is the combustion section. In this part, fuel is injected and mixed with the compressed air from the compressor, and the igniter provides the initial flame to start combustion. Once the flame is established, the combustion process continues, producing hot, high‑pressure gas that drives the turbine. The compressor section only compresses air, and the turbine section uses the hot gases to extract energy; neither is a place where burning occurs. The accessory gearbox powers engine accessories, not ignition. So ignition is placed in the combustion chamber to create and sustain the flame needed to produce the engine’s power.

Ignition must happen where the fuel can burn efficiently, which is the combustion section. In this part, fuel is injected and mixed with the compressed air from the compressor, and the igniter provides the initial flame to start combustion. Once the flame is established, the combustion process continues, producing hot, high‑pressure gas that drives the turbine.

The compressor section only compresses air, and the turbine section uses the hot gases to extract energy; neither is a place where burning occurs. The accessory gearbox powers engine accessories, not ignition. So ignition is placed in the combustion chamber to create and sustain the flame needed to produce the engine’s power.