Scalloped surface turbine stage

摘要

A turbine stage includes a row of airfoils joined to corresponding platforms to define flow passages therebetween. Each airfoil includes opposite pressure and suction sides and extends in chord between opposite leading and trailing edges. At least some of the platforms have a scalloped flow surface including a bulge adjoining the pressure side and a bowl 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.

主权项

1. A turbine stage comprising:
a row of airfoils integrally joined to corresponding platforms and spaced laterally apart to define respective flow passages therebetween for channeling gases, each flow passage having a width; each of the airfoils including a concave pressure side and a laterally opposite convex suction side extending in chord between opposite leading and trailing edges; and at least some of the platforms having a scalloped flow surface including a bulge adjoining the pressure side and a bowl adjoining the suction side aft of the leading edge of the respective airfoils, wherein 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, and wherein the bowl is configured having a maximum depth located within its respective flow passage and directly adjoining the suction side of the respective airfoil.