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Last stage turbine blade including a plurality of leading edge indentations, corresponding rotor assembly and steam turbine

A steam turbine and last-stage blade technology, which is applied to blade support components, engine components, engine manufacturing, etc., can solve problems affecting the reliability of the last-stage blades

Inactive Publication Date: 2015-07-01
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aerodynamic forces and shock wave transient effects caused by supersonic inlet conditions can negatively impact final stage blade reliability due to potentially damaging vibrations

Method used

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  • Last stage turbine blade including a plurality of leading edge indentations, corresponding rotor assembly and steam turbine
  • Last stage turbine blade including a plurality of leading edge indentations, corresponding rotor assembly and steam turbine

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Embodiment Construction

[0012] As noted above, the present invention relates generally to turbomachines, such as steam turbines, and more particularly to steam turbine last stage blades that include a plurality of indentations at the leading edges.

[0013] Under normal operating conditions of the steam turbine, the throughflow extends along the entire length of the last steam turbine blade. However, under extreme turn-down conditions with low flow and / or high exhaust pressure, the through-flow only flows through the tip portions of the last stage steam turbine blades.

[0014] When through-flow flows only through the tip portion of the last stage steam turbine blades, the blades experience supersonic inlet conditions and a shock wave will form at the blade discharge inlet. Across the shock, the pressure drops suddenly. Aerodynamic forces and shock wave transient effects caused by supersonic inlet conditions can negatively affect the reliability of the last stage blade due to potentially damaging vi...

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PUM

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Abstract

Aspects of the invention provide for a last stage blade of a steam turbine. In one embodiment, the last stage blade of a steam turbine includes: a blade leading edge for receiving a through flow, the blade leading edge including a plurality of indentations at a top portion of the steam turbine blade; and a blade trailing edge for exhausting the through flow.

Description

technical field [0001] The present invention relates generally to turbomachines, such as steam turbines, and more particularly to steam turbine last stage blades that include a plurality of indentations at the leading edges. Background technique [0002] Under normal operating conditions of the steam turbine, the throughflow extends along the entire length of the last steam turbine blade. However, under extreme turn-down conditions with low flow and / or high exhaust pressure, the through-flow only flows through the tip portions of the last stage steam turbine blades. [0003] When through-flow flows only through the tip portion of the last stage steam turbine blades, the blades experience supersonic inlet conditions and a shock wave will form at the blade discharge inlet. Across the shock, the pressure drops suddenly. Aerodynamic forces and shock wave transient effects caused by supersonic inlet conditions can negatively affect the reliability of the last stage blade due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/16
CPCF05D2220/3215F01D5/16F05D2250/61F05D2220/31F05D2240/303F05D2260/941
Inventor A·D·马道斯
Owner GENERAL ELECTRIC CO