Turbine engine with annular cavity

A turbine engine comprising:

• an outer casing having a first surface facing an interior of the outer casing and defining an axial centerline;
• a turbine section provided within the interior of the outer casing and having counter rotatable inner and outer drums each including a set of blades extending therefrom and rotatable about the axial centerline through which a flow of combustion gasses flows in a forward to aft direction, the outer drum defining a second surface spaced from the first surface to define an annular cavity between the first and second surfaces;
• a set of seals extending between the first surface and the second surface to define at least one cooled cavity within the annular cavity;
• and
• a set of flow passages provided in the outer drum and fluidly coupling the at least one cooled cavity to the turbine section.

A method for cooling an annular cavity of a turbine engine having an outer casing and an outer drum with the annular cavity formed therebetween, the method comprising:

• introducing a cooling fluid into the annular cavity;
• flowing the cooling fluid through at least one cooled cavity located within the annular cavity;
• and,
• flowing at least a portion of the cooling fluid through a flow passage in the outer drum.