What can excessive primary air lead to in a combustion chamber?

Excessive primary air in a combustion chamber can lead to flame instability. When there is too much air mixed with the fuel, the combustion process can become erratic. This instability can manifest as fluctuations in flame size, altered flame shape, or even flame flickering. The ideal air-to-fuel ratio is crucial for maintaining a stable and efficient combustion process, and an excess of primary air disrupts this balance, preventing the flame from burning steadily.

In contrast, quicker ignition, longer burn time, and increased combustion efficiency typically require optimal conditions rather than excessive air. Quicker ignition often occurs with the right mix of air and fuel, while longer burn times and higher combustion efficiency depend on a balanced environment within the combustion chamber. Thus, it is clear that excessive primary air primarily contributes to flame instability.