Cooling circuit for a multi-wall blade

A multi-wall turbine blade, comprising:

• a cooling system disposed within the multi-wall turbine blade, the multi-wall blade including at least one central plenum and a first set of near wall cooling channels, the cooling system including:
• a forked passage cooling circuit, the forked passage cooling circuit including a first leg and a second leg;
• and
• an air feed cavity for supplying cooling air to the first leg and the second leg of the forked passage cooling circuit;
• wherein the first leg and the second leg of the forked cooling circuit are located at a radial position along the multi-wall blade that is closer to a tip area of the multi-wall blade than the at least one central plenum and the first set of near wall cooling channels, wherein the first leg of the forked passage cooling circuit extends radially outward from and at least partially over the at least one central plenum of the multi-wall blade, and wherein the second leg of the forked passage cooling circuit extends radially outward from and at least partially over the first set of near wall cooling channels in the multi-wall blade.

A turbomachine, comprising:

• a gas turbine system including a compressor component, a combustor component, and a turbine component, the turbine component including a plurality of turbine buckets, and wherein at least one of the turbine buckets includes a multi-wall blade;
• and
• a cooling system disposed within the multi-wall blade, the multi-wall blade including at least one central plenum and a first set of near wall cooling channels, the cooling system including:
• a forked passage cooling circuit, the forked passage cooling circuit including a first leg and a second leg;
• and
• an air feed cavity for supplying cooling air to the first leg and the second leg of the forked passage cooling circuit;
• wherein the first leg and the second leg of the forked cooling circuit are located at a radial position along the multi-wall blade that is closer to a tip area of the multi-wall blade than the at least one central plenum and the first set of near wall cooling channels, wherein the first leg of the forked passage cooling circuit extends radially outward from and at least partially over the at least one central plenum of the multi-wall blade, and wherein the second leg of the forked passage cooling circuit extends radially outward from and at least partially over the first set of near wall cooling channels in the multi-wall blade.