A COOLED TURBINE VANE PLATFORM COMPRISING FORWARD, MIDCHORD AND AFT COOLING CHAMBERS IN THE PLATFORM

摘要

A cooling system (10) positioned within a turbine airfoil (12) and having film cooling channels (16) positioned within inner and outer endwalls (18, 20) of the turbine airfoil (12), with cooling fluids supplied to the cooling channels (16) other than from an aft cooling chamber (22) to prevent blockages from developing within the film cooling channels (16) from debris that typically collects with the aft cooling chamber (22) during steady state operation of the turbine engine is disclosed. The cooling system (10) may include one or more midchord cooling channels (24) extending from a midchord cooling chamber (26) and including an outlet (28) positioned closer to a downstream edge (30) of the inner endwall (18) than an upstream wall (32) forming the aft cooling chamber (22). The midchord cooling channel, thus, may cool aspects of the inner endwall (18) radially outward of the aft cooling chamber (22) without receiving cooling fluid from aft cooling chamber (22), thereby eliminating the possibility of blockages from debris in the aft cooling chamber (22).