Turbine stage and corresponding turbine blade having a scalloped platform

摘要

A turbine stage includes a row of airfoils (14) joined to corresponding platforms (16) to define flow passages (36) therebetween. Each airfoil includes opposite pressure (20) and suction (22) sides and extends in chord between opposite leading (24) and trailing (26) edges. At least some of the platforms have a scalloped flow surface including a bulge (38) adjoining the pressure side and a bowl (40) adjoining the suction side, aft of the leading edge, of the respective airfoils. The bulge is configured having a maximum height located within its respective flow passage, and wherein the bulge decreases in height in a forward and aft direction and decreases in height laterally toward the pressure side of the airfoil and toward the bowl adjoining the suction side of a next adjacent airfoil. A corresponding turbine blade is also provided.