Spark igniters are in which combustion liners?

Spark igniters are in which combustion liners?

• A. Number 1 and Number 2
• B. Number 3 and Number 4
• C. Number 2 and Number 5
• D. Number 4 and Number 6

Answer: (C)

Spark ignition starts by placing igniters in the combustion liners that are designated for light-off. These liners are chosen so a single spark can reliably ignite the air-fuel mixture and then spread flame to neighboring burners, giving a stable start across the whole combustor. The two ignition liners in this engine configuration are positioned to cover the essential ignition zone and provide redundancy during light-off. That pairing is the one identified as the ignition set in the diagram. Other liners aren’t equipped with igniters because they’re not used for light-off and are instead dedicated to other functions like fuel distribution or cooling, which would not support reliable ignition if used for sparks.

Spark ignition starts by placing igniters in the combustion liners that are designated for light-off. These liners are chosen so a single spark can reliably ignite the air-fuel mixture and then spread flame to neighboring burners, giving a stable start across the whole combustor. The two ignition liners in this engine configuration are positioned to cover the essential ignition zone and provide redundancy during light-off. That pairing is the one identified as the ignition set in the diagram. Other liners aren’t equipped with igniters because they’re not used for light-off and are instead dedicated to other functions like fuel distribution or cooling, which would not support reliable ignition if used for sparks.