Method and apparatus for turbine clearance flow reduction

摘要

A method for reducing clearance flow in a channel between a bucket and an enclosure of a turbine. The method includes separating a single flow in the channel 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. A turbine includes an inner casing, a rotatable shaft positioned axially within the inner casing, a plurality of buckets connected to the shaft, a first tooth projecting radially inward from and connected to the inner casing, wherein the first tooth and at least one bucket form a first fluidic channel therebetween and a second tooth connected to and in parallel with the first tooth form a radial fluidic channel. The axial fluidic channel is in communication with the radial fluidic channel to form a second fluidic channel.

主权项

1. A method for reducing clearance flow in a channel between a bucket and an enclosure of a turbine, comprising:
generating a first flow and a second flow; directing the second flow radially inward toward the bucket so that the second flow joins with the first flow to reduce the clearance flow and thereby increase overall flow through the bucket, wherein the second flow is captured from a clearance between a tip of a nozzle located upstream from the bucket and an inner casing of the turbine.