Multi-turn cooling circuits for turbine blades

A turbine blade comprising:

• a trailing edge cooling system disposed within the turbine blade, the trailing edge cooling system including:
• a coolant feed extending radially within the turbine blade;
• a collection passage extending radially within the turbine blade, adjacent the coolant feed;
• and
• a plurality of cooling circuits extending at least partially along a radial length of a trailing edge of the turbine blade, each of the plurality of cooling circuits in direct fluid communication with the coolant feed and the collection passage and each of the plurality of cooling circuits including:
• an outward leg extending axially toward the trailing edge of the turbine blade, the outward leg in direct fluid communication with the coolant feed;
• a return leg positioned adjacent the outward leg and extending axially from the trailing edge of the turbine blade, the return leg in direct fluid communication with the collection passage;
• and
• a plurality of turn legs fluidly coupling the outward leg and the return leg, the plurality of turn legs including:
• a turn leg positioned directly adjacent the trailing edge of the turbine blade;
• and
• a distinct turn leg positioned axially adjacent the turn leg, opposite the trailing edge of the turbine blade, the distinct turn leg oriented non-parallel to at least one of the outward leg and the return leg.

A trailing edge cooling system for a turbine blade, the trailing edge cooling system comprising:

• a coolant feed extending radially within the turbine blade;
• a collection passage extending radially within the turbine blade, adjacent the coolant feed;
• and
• a cooling circuit in fluid communication with the coolant feed and the collection passage, the cooling circuit including:
• an outward leg extending axially toward a trailing edge of the turbine blade, the outward leg in direct fluid communication with the coolant feed;
• a return leg positioned adjacent the outward leg and extending axially from the trailing edge of the turbine blade, the return leg in direct fluid communication with the collection passage;
• and
• a plurality of turn legs fluidly coupling the outward leg and the return leg, the plurality of turn legs including:
• a first turn leg in direct fluid communication with and extending radially from the outward leg, the first turn leg extending directly adjacent the trailing edge;
• a second turn leg in direct fluid communication with the first turn leg, the second turn leg extending axially from the first turn leg and away from the trailing edge of the turbine blade;
• and
• a third turn leg extending radially from the second turn leg, the third turn leg in direct fluid communication with the second turn leg and the return leg.