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Reduction in Secondary Losses in Turbine Cascade Using Contoured Boundary Layer Fence

Deshpande, Srikanth LU ; Thern, Marcus LU and Genrup, Magnus LU (2014) ASME Gas Turbine India Conference In Proceedings of the ASME 2014 Gas Turbine India Conference p.2014-8175
Abstract
Present work deals with reducing secondary losses in turbine cascade by using boundary layer fences in two ways. Firstly, to reduce the strength of vortex which is incident at the leading edge of airfoil and hence reduce the strength of horse shoe vortex, and secondly, to reduce the pressure gradient between the pressure side and the suction side in the flow passage region between airfoils. In previous works, the boundary layer fence followed the profile of airfoil. In this publication, boundary layer fence does not follow the profile of airfoil i.e stagger and camber of boundary fence is different when compared to airfoil. A profiled boundary layer fence is proposed in the present work which reduces the incident voracity and also reduces... (More)
Present work deals with reducing secondary losses in turbine cascade by using boundary layer fences in two ways. Firstly, to reduce the strength of vortex which is incident at the leading edge of airfoil and hence reduce the strength of horse shoe vortex, and secondly, to reduce the pressure gradient between the pressure side and the suction side in the flow passage region between airfoils. In previous works, the boundary layer fence followed the profile of airfoil. In this publication, boundary layer fence does not follow the profile of airfoil i.e stagger and camber of boundary fence is different when compared to airfoil. A profiled boundary layer fence is proposed in the present work which reduces the incident voracity and also reduces pressure gradient from pressure side to suction side. Such boundary layer fence was checked on T106 test cascade which is available as open literature. Numerical work is carried out using commercial software Ansys CFX. Viscous RANS simulations are carried out using k-omega SST turbulence model with yplus value around unity on all walls. Coefficient of secondary kinetic energy (CSKE) and Secondary Kinetic energy helicity (SKEH) are used as target functions. Total pressure loss is also monitored. All the three functions show a reduction in secondary loss. The strength of horse shoe vortex is reduced by the fence protruding in front of leading edge. The converging flow passage created by the fence near the pressure side of airfoil reduces the pressure gradient from pressure side to suction side. The total pressure loss was reduced by 1.5 % and CSKE was improved by 36 % when the boundary layer fence was adopted. (Less)
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
keywords
Secondary loss, Boundary layer fence, Coefficient of Secondary kinetic, energy, Secondary kinetic energy helicity
in
Proceedings of the ASME 2014 Gas Turbine India Conference
pages
2014 - 8175
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME Gas Turbine India Conference
external identifiers
  • WOS:000360950100015
  • Scopus:84926278825
ISBN
978-0-7918-4964-4
DOI
10.1115/GTINDIA2014-8175
language
English
LU publication?
yes
id
8d4dcd4b-23e2-4d58-9df9-7e5dfc817e28 (old id 8077445)
date added to LUP
2015-10-26 12:47:49
date last changed
2016-10-13 04:37:34
@misc{8d4dcd4b-23e2-4d58-9df9-7e5dfc817e28,
  abstract     = {Present work deals with reducing secondary losses in turbine cascade by using boundary layer fences in two ways. Firstly, to reduce the strength of vortex which is incident at the leading edge of airfoil and hence reduce the strength of horse shoe vortex, and secondly, to reduce the pressure gradient between the pressure side and the suction side in the flow passage region between airfoils. In previous works, the boundary layer fence followed the profile of airfoil. In this publication, boundary layer fence does not follow the profile of airfoil i.e stagger and camber of boundary fence is different when compared to airfoil. A profiled boundary layer fence is proposed in the present work which reduces the incident voracity and also reduces pressure gradient from pressure side to suction side. Such boundary layer fence was checked on T106 test cascade which is available as open literature. Numerical work is carried out using commercial software Ansys CFX. Viscous RANS simulations are carried out using k-omega SST turbulence model with yplus value around unity on all walls. Coefficient of secondary kinetic energy (CSKE) and Secondary Kinetic energy helicity (SKEH) are used as target functions. Total pressure loss is also monitored. All the three functions show a reduction in secondary loss. The strength of horse shoe vortex is reduced by the fence protruding in front of leading edge. The converging flow passage created by the fence near the pressure side of airfoil reduces the pressure gradient from pressure side to suction side. The total pressure loss was reduced by 1.5 % and CSKE was improved by 36 % when the boundary layer fence was adopted.},
  author       = {Deshpande, Srikanth and Thern, Marcus and Genrup, Magnus},
  isbn         = {978-0-7918-4964-4},
  keyword      = {Secondary loss,Boundary layer fence,Coefficient of Secondary kinetic,energy,Secondary kinetic energy helicity},
  language     = {eng},
  pages        = {2014--8175},
  publisher    = {ARRAY(0x5007430)},
  series       = {Proceedings of the ASME 2014 Gas Turbine India Conference},
  title        = {Reduction in Secondary Losses in Turbine Cascade Using Contoured Boundary Layer Fence},
  url          = {http://dx.doi.org/10.1115/GTINDIA2014-8175},
  year         = {2014},
}