Definition
A chamber within a turbine engine combustion section where fuel and air are held briefly in a controlled, low-velocity zone so that combustion can stabilize and continue burning before the gases pass downstream to the turbine.
Plain English
A space inside the burner section where the burning fuel-air mixture is allowed to linger long enough to keep the flame steady before it moves on through the engine.
Context Anchor
Seen in aircraft engine fuel-system and carburetor maintenance discussions, especially when describing how fuel is prepared before it is metered to the engine.
Derivation
‘Dwell’ comes from Old English ‘dwellan,’ meaning to delay or remain in a place. So a dwell chamber is literally a chamber where something is held in place for a moment — in this case, the burning gases.
Why Pilots Care
Correct dwell produces reliable ignition and prevents weak sparks that can cause misfires or rough running.
Analogy
It is like letting a fizzy drink sit for a moment so some bubbles rise out before you pour it carefully.
Intuition Check
Do not read “dwell” here as a place where something lives. In this fuel-system use, it means the fuel pauses briefly in a chamber so vapor bubbles can separate.
Example Sentence 1
The combustor is designed with a dwell chamber so the flame has time to stabilize before the hot gases reach the turbine.
Example Sentence 2
Adjusting the dwell chamber too short can reduce spark strength at higher engine speeds.