END WALL CONTOUR FOR AN AXIAL FLOW TURBINE STAGE

A turbine stage includes a row of airfoils 14 joined to corresponding platforms to define flow passages therebetween. Each airfoil includes opposite pressure 20 and suction 22 sides and extends in chord between opposite leading 24 and trailing 28 edges. Each platform has a contoured flow surface inc...

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Bibliographische Detailangaben
Hauptverfasser:	VENUGOPAL, Prem, STEIN, Alexander, OTTA, Shourya Prakash, SURESH, Ambady
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES STEAM ENGINES WEAPONS
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Beschreibung
Zusammenfassung:	A turbine stage includes a row of airfoils 14 joined to corresponding platforms to define flow passages therebetween. Each airfoil includes opposite pressure 20 and suction 22 sides and extends in chord between opposite leading 24 and trailing 28 edges. Each platform has a contoured flow surface including a purge valley 38, an elevated bulge 46 and a bowl 48. The purge valley has a maximum depth at an elevation equal to or greater than a nominal axisymmetric platform surface of the corresponding platform. The purge valley extending tangentially against a purge cavity wall 41 and into the blend area and extending axially from proximate the leading edge of a first airfoil toward the suction side of the first airfoil, and toward the leading edge of a second adjacent airfoil to channel a purge flow. The elevated bulge adjoins the pressure side aft of the leading edge and the bowl adjoins the suction side aft of the leading edge.