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Linear stability prediction of vortex structures on high pressure turbine blades

Linear stability prediction of vortex structures on high pressure turbine blades
Linear stability prediction of vortex structures on high pressure turbine blades
Velocity profiles are extracted from time- and span-averaged direct numerical simulation data, describing the flow over a high-pressure turbine vane linear cascade near engine-scale conditions with reduced inlet disturbance levels. Based on these velocity profiles, local as well as non-local linear stability analysis of the boundary-layer over the suction side of the vane is carried out in order to characterise a linearly unstable region close to the trailing edge. The largest growth rates are found for oblique modes, but those are only slightly more unstable than 2D modes, which describe the locations and frequencies of most unstable modes very well. The frequencies of the most unstable linear modes predict with good accuracy the predominant frequencies found in the direct numerical simulations (DNS) close to the trailing edge.
2504-186x
1-9
Zauner, Markus
c0207f79-62cc-4909-8aa0-6bb9d99e1ea3
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Wheeler, Andrew
0f243ba3-3aae-470c-ba4a-46a8c4b9197a
Sandberg, Richard
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa
Zauner, Markus
c0207f79-62cc-4909-8aa0-6bb9d99e1ea3
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Wheeler, Andrew
0f243ba3-3aae-470c-ba4a-46a8c4b9197a
Sandberg, Richard
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa

Zauner, Markus, Sandham, Neil D., Wheeler, Andrew and Sandberg, Richard (2017) Linear stability prediction of vortex structures on high pressure turbine blades. International Journal of Turbomachinery, Propulson and Power, 2 (2), 1-9, [8]. (doi:10.3390/ijtpp2020008).

Record type: Article

Abstract

Velocity profiles are extracted from time- and span-averaged direct numerical simulation data, describing the flow over a high-pressure turbine vane linear cascade near engine-scale conditions with reduced inlet disturbance levels. Based on these velocity profiles, local as well as non-local linear stability analysis of the boundary-layer over the suction side of the vane is carried out in order to characterise a linearly unstable region close to the trailing edge. The largest growth rates are found for oblique modes, but those are only slightly more unstable than 2D modes, which describe the locations and frequencies of most unstable modes very well. The frequencies of the most unstable linear modes predict with good accuracy the predominant frequencies found in the direct numerical simulations (DNS) close to the trailing edge.

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Accepted/In Press date: 22 May 2017
e-pub ahead of print date: 26 May 2017
Published date: 26 May 2017

Identifiers

Local EPrints ID: 412322
URI: http://eprints.soton.ac.uk/id/eprint/412322
ISSN: 2504-186x
PURE UUID: 032d4178-fbb4-497b-bea8-f3f440ff0619
ORCID for Markus Zauner: ORCID iD orcid.org/0000-0002-6644-2990
ORCID for Neil D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944
ORCID for Richard Sandberg: ORCID iD orcid.org/0000-0001-5199-3944

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Date deposited: 17 Jul 2017 13:29
Last modified: 25 May 2024 01:36

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Contributors

Author: Markus Zauner ORCID iD
Author: Neil D. Sandham ORCID iD
Author: Andrew Wheeler
Author: Richard Sandberg ORCID iD

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