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Method and apparatus for turbine clearance flow reduction

A gap flow and turbine technology, applied in the direction of mechanical equipment, machine/engine, leakage prevention, etc., can solve problems such as edge-level rotor blade loss

Inactive Publication Date: 2013-10-30
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in closed systems, there are often losses at the edge stage buckets as the steam flows through the buckets between the tip and the inner wall of the turbine shroud

Method used

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  • Method and apparatus for turbine clearance flow reduction
  • Method and apparatus for turbine clearance flow reduction
  • Method and apparatus for turbine clearance flow reduction

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Embodiment Construction

[0070] Reference will now be made in detail to various embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of illustration of an embodiment, not intended as a limitation thereof. For example, features illustrated as part of one embodiment may be combined with other embodiments. Any such modifications and variations are intended to be included herein.

[0071] figure 1 is a perspective partial cutaway view of a steam turbine 10 including a rotor 12 including a shaft 14 and a low pressure (LP) turbine 16 . The LP turbine 16 includes a plurality of axially spaced rotor wheels 18 . A plurality of buckets 20 are mechanically coupled to each rotor wheel 18 . More specifically, buckets 20 are arranged in rows that extend circumferentially about shaft 14 and are positioned axially about each rotor wheel 18 . A plurality of stationary nozzles 22 extend circumferentially about shaft 14 and are pos...

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PUM

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Abstract

A method for reducing clearance flow in a channel 155 between a bucket 20 and an enclosure of a turbine 10. The method includes separating a single flow in the channel 155 into a first flow and a second flow and directing the second flow radially inward toward the bucket so that the second flow rejoins with the first flow to increase total flow onto the bucket 20. A turbine 10 includes an inner casing 160, a rotatable shaft 14 positioned axially within the inner casing 160, a plurality of buckets 20 connected to the shaft 14, a first tooth 162 projecting radially inward from and connected to the inner casing 160, wherein the first tooth 162 and at least one bucket 20 form a first fluidic channel therebetween and a second tooth 170 connected to and in parallel with the first tooth 162 form a radial fluidic channel. The axial fluidic channel is in communication with the radial fluidic channel to form a second fluidic channel 166.

Description

technical field [0001] Embodiments of the present disclosure relate to applications related to steam turbines, and more particularly, to apparatus for reducing margin stage bucket clearance flow. Background technique [0002] Advances in steam turbine technology have yielded improvements in efficiency and power generation capability. In closed systems, however, there are often losses at the edge stage buckets as steam flows through the buckets between the bucket tips and the inner wall of the turbine shroud. Reducing the physical clearance of the buckets only works to a certain extent, as certain minimum physical tolerances must be observed to allow the buckets to rotate freely. Therefore, there is a need to reduce the effective gap to reduce the loss of steam flow without reducing the physical gap. Contents of the invention [0003] A simplified executive summary describing certain aspects or embodiments of the disclosure is presented below. This executive summary is n...

Claims

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Application Information

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IPC IPC(8): F01D11/10
CPCF01D11/10F01D11/04
Inventor 王宇
Owner GENERAL ELECTRIC CO