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Efficiency improvements in an industrial steam turbine stage - Part 2

Deshpande, Srikanth LU ; Thern, Marcus LU and Genrup, Magnus LU (2016) ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016 In Turbomachinery 2B-2016.
Abstract

Improvement in isentropic total to total efficiency of a low reaction turbine stage by airfoil redesign was considered in first part of the paper. Further, modifications in the flow path of the baseline stage is considered in second part of the paper. Flow path of the baseline stage incorporates axisymmetric meridional endwall contour(commonly called Russian kink). For a stage comprising of high aspect ratio blades, assessment of performance with endwall contour is performed. Alternatives, if required for endwall contour had to be explored and numerically verified. Endeavor in the present paper is in this direction. Static pressure distribution at the stator exit is considered as the main objective. Along with flow path modification,... (More)

Improvement in isentropic total to total efficiency of a low reaction turbine stage by airfoil redesign was considered in first part of the paper. Further, modifications in the flow path of the baseline stage is considered in second part of the paper. Flow path of the baseline stage incorporates axisymmetric meridional endwall contour(commonly called Russian kink). For a stage comprising of high aspect ratio blades, assessment of performance with endwall contour is performed. Alternatives, if required for endwall contour had to be explored and numerically verified. Endeavor in the present paper is in this direction. Static pressure distribution at the stator exit is considered as the main objective. Along with flow path modification, stator modifications like vortexing and lean are attempted to obtain stator exit static pressure distribution similar to baseline case. Straight lean on stator provides good results in terms of reducing stator exit pressure gradient as well as reducing gradient of rotor inlet swirl. Since the pressure distribution at stator exit also drives the tip leakage flow, effect of flowpath and stator modifications on tip leakage flow is studied. Performance numbers are reported for cases with and without tip shroud.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Turbomachinery
volume
2B-2016
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016
external identifiers
  • scopus:84991759468
ISBN
9780791849705
DOI
10.1115/GT2016-57140
language
English
LU publication?
yes
id
366d3421-0678-426d-b3c1-1fb94960a65a
date added to LUP
2017-03-20 11:07:59
date last changed
2017-04-10 16:27:40
@inproceedings{366d3421-0678-426d-b3c1-1fb94960a65a,
  abstract     = {<p>Improvement in isentropic total to total efficiency of a low reaction turbine stage by airfoil redesign was considered in first part of the paper. Further, modifications in the flow path of the baseline stage is considered in second part of the paper. Flow path of the baseline stage incorporates axisymmetric meridional endwall contour(commonly called Russian kink). For a stage comprising of high aspect ratio blades, assessment of performance with endwall contour is performed. Alternatives, if required for endwall contour had to be explored and numerically verified. Endeavor in the present paper is in this direction. Static pressure distribution at the stator exit is considered as the main objective. Along with flow path modification, stator modifications like vortexing and lean are attempted to obtain stator exit static pressure distribution similar to baseline case. Straight lean on stator provides good results in terms of reducing stator exit pressure gradient as well as reducing gradient of rotor inlet swirl. Since the pressure distribution at stator exit also drives the tip leakage flow, effect of flowpath and stator modifications on tip leakage flow is studied. Performance numbers are reported for cases with and without tip shroud.</p>},
  author       = {Deshpande, Srikanth and Thern, Marcus and Genrup, Magnus},
  booktitle    = {Turbomachinery},
  isbn         = {9780791849705},
  language     = {eng},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Efficiency improvements in an industrial steam turbine stage - Part 2},
  url          = {http://dx.doi.org/10.1115/GT2016-57140},
  volume       = {2B-2016},
  year         = {2016},
}