Cooling circuit for a multi-wall blade

An apparatus comprising:

• a multi-wall turbine blade;
• and
• a cooling circuit disposed within the multi-wall turbine blade, the cooling circuit including:
• a pressure side cavity with a surface adjacent a pressure side of the multi-wall blade;
• a suction side cavity with a surface adjacent a suction side of the multi-wall blade;
• a central cavity disposed between the pressure side and suction side cavities, the central cavity including no surfaces adjacent the pressure and suction sides of the multi-wall blade;
• a first leading edge cavity with surfaces adjacent the pressure and suction sides of the multi-wall blade;
• and
• at least one impingement opening for fluidly coupling the first leading edge cavity with a second leading edge cavity;
• a turn for directing a first portion of a flow of cooling air from the pressure side cavity into the central cavity;
• a turn for directing a second portion of the flow of cooling air from the suction side cavity into the central cavity, the first and second portions of the flow of cooling air recombining into a recombined flow of cooling air in the central cavity;
• and
• a turn for directing the recombined flow of cooling air from the central cavity into the first leading edge cavity.

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 turbomachine blades, and wherein at least one of the turbomachine blades includes a multi-wall blade;
• and
• a cooling circuit disposed within the multi-wall blade, the cooling circuit including:
• a pressure side cavity with a surface adjacent a pressure side of the multi-wall blade;
• a suction side cavity with a surface adjacent a suction side of the multi-wall blade;
• a central cavity disposed between the pressure side and suction side cavities, the central cavity including no surfaces adjacent the pressure and suction sides of the multi-wall blade;
• a first leading edge cavity with surfaces adjacent the pressure and suction sides of the multi-wall blade;
• at least one impingement opening for fluidly coupling the first leading edge cavity with a second leading edge cavity;
• a turn for directing a first portion of a flow of cooling air from the pressure side cavity into the central cavity;
• a turn for directing a second portion of the flow of cooling air from the suction side cavity into the central cavity, the first and second portions of the flow of cooling air recombining into a recombined flow of cooling air in the central cavity;
• and
• a turn for directing the recombined flow of cooling air from the central cavity into the first leading edge cavity.