Coolant airflow assembly particulate filter with panels in series

A gas turbine engine comprising a coolant airflow assembly, comprising:

• a coolant feed passage connected between a supply of coolant air and an inlet of a component to be cooled, the coolant feed passage defining a coolant airflow path and comprising first and second opposing internal faces, the inlet of the component connected to the coolant airflow path through one of the first and second internal faces of the coolant feed passage;
• and
• a particulate filter for removing entrained particles from the coolant airflow path, comprising:
• a first filter panel extending from the first face into the coolant airflow path upstream of the inlet of the component;
• and
• a second filter panel extending from the second face into the coolant airflow path upstream of the first filter panel.

A coolant airflow assembly for a gas turbine engine, comprising:

• a coolant feed passage connected between a supply of coolant air and an inlet of a component to be cooled, the coolant feed passage defining a coolant airflow path and comprising first and second opposing internal faces, the inlet of the component connected to the coolant airflow path through one of the first and second internal faces of the coolant feed passage;
• and
• a particulate filter for removing entrained particles from the coolant airflow path, comprising:
• a first filter panel extending from the first face into the coolant airflow path upstream of the inlet of the component;
• and
• a second filter panel extending from the second face into the coolant airflow path upstream of the first filter panel;
• wherein the first and second filter panels are integrated into a common panel having an airflow passage between the first and second panels defined in series by an inlet through one hole in the common panel and an outlet through a further hole in the common panel;
• the holes have a diameter of between 0.1 and 1 mm, between 0.1 and 0.5 mm, or between 0.2 and 0.4 mm.