Manifold for turbine blade of gas turbine engine

A turbine blade comprising:

• a platform defining a first side and a second side;
• a blade airfoil attached to the first side of the platform, the blade airfoil comprising a pressure side wall and a suction side wall defining a blade airfoil interior;
• a blade root attached to the second side of the platform, the blade root including a blade root leading edge and a blade root trailing edge with respect to a flow direction of a working flow, the blade root defining a first cooling passage and a second cooling passage that are in flow communication with the blade airfoil interior;
• and
• a manifold attached to the blade root, the manifold being non-planar, the manifold comprising:
• an outer wall;
• a first compartment having a first flow area defined by a first aperture, the first aperture being formed at the outer wall and open to the first compartment, the first compartment metering a non-zero first flow of cooling air to the first cooling passage through the first flow area;
• and
• a second compartment having a second flow area defined by a second aperture, the second aperture being formed at the outer wall and open to the second compartment, the second compartment metering a non-zero second flow of cooling air to the second cooling passage through the second flow area that is different than the first flow area,
• wherein the outer wall further comprises:
• a first side plate that extends between the blade root leading edge and the blade root trailing edge;
• a second side plate that extends between the blade root leading edge and the blade root trailing edge;
• an outer plate that extends between the first side plate and the second side plate;
• a forward plate attached to the first side plate, the second side plate, and the outer plate at one end;
• and
• an aft plate attached to the first side plate, the second side plate, and the outer plate at the other end that is opposite to the one end,
• wherein the outer plate is solid and spaced a non-zero distance away from a blade root end surface.