Ignitor housing for a combustor of a gas turbine

A gas turbine comprising:

• a compressor section;
• and
• a combustor, the compressor section providing a flow of compressed air to the combustor, the combustor defining a combustor centerline axis and comprising:
• a combustor liner defining a combustion chamber in which combustion gases flow in a first direction with respect to the combustor centerline axis;
• at least one swirler assembly providing a flow of the compressed air and a fuel as a fuel-air mixture to the combustion chamber;
• an outer casing surrounding the combustor liner and defining an outer flow passage therebetween in which a flow of cooling air flows in the first direction within the outer flow passage, at least a portion of the flow of compressed air being routed through the outer flow passage;
• an ignitor housing extending through an ignitor opening through the combustor liner and extending through the outer flow passage, the ignitor housing having an inner end arranged proximally flush to a hot surface side of the combustor liner adjacent to the combustion chamber;
• and
• an ignitor disposed within the ignitor housing to ignite the fuel-air mixture,
• wherein the ignitor housing includes a housing wall defining a perimeter of the ignitor housing, the housing wall having an upstream wall portion with respect to the first direction extending from the outer casing to the inner end of the ignitor housing, and a downstream wall portion with respect to the first direction extending from the outer casing to the inner end of the ignitor housing, and the housing wall including (a) at least one airflow inlet passage extending through a downstream surface of the downstream wall portion and arranged within the outer flow passage, and (b) at least one cooling passage within the downstream wall portion the at least one cooling passage extending along a length of the downstream wall portion from the at least one airflow inlet passage and through the inner end of the downstream wall portion, the at least one cooling passage being in fluid communication with the at least one airflow inlet passage.