Coolable vane or blade for a turbomachine

A coolable fluid reaction element for a turbomachine, comprising:

• an airfoil having a pressure wall and a suction wall, each wall extending from an airfoil leading edge to an airfoil trailing edge, the walls having respective pressure and suction surfaces exposed to a stream of fluid in a fluid flowpath;
• forward and aft imperforate ribs extending laterally across the airfoil, each rib having a suction side terminus and a pressure side terminus, the suction side termini chordwisely delimiting a segment of the suction wall and the pressure side termini chordwisely delimiting an imperforate segment of the pressure wall;
• an internal plenum for distributing a pressurized coolant, the plenum bounded by the ribs and the delimited wall segments;
• and
• at least one array of cooling holes penetrating the suction wall segment, the at least one hole array being the exclusive avenue for conveying coolant from the plenum to the fluid flowpath.

A coolable fluid reaction element for a turbomachine, comprising:

• an airfoil having a pressure wall and a suction wall, each wall extending from an airfoil leading edge to an airfoil trailing edge, the walls having respective pressure and suction surfaces exposed to a stream of fluid in a fluid flowpath;
• forward and aft imperforate ribs extending laterally across the airfoil, each rib having a suction side terminus and a pressure side terminus, the suction side termini chordwisely delimiting a segment of the suction wall and straddling a point of minimum fluid pressure along the suction surface, the ribs converging toward the pressure wall so that the ribs cooperate with the suction wall to define a three sided plenum for distributing a pressurized coolant;
• and
• at least one array of cooling holes penetrating the suction wall segment, the at least one hole array being the exclusive avenue for conveying coolant from the plenum to the fluid flowpath.