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Large eddy simulations of a low-pressure turbine: roughness modeling and the effects on boundary layer transition and losses

Large eddy simulations of a low-pressure turbine: roughness modeling and the effects on boundary layer transition and losses
Large eddy simulations of a low-pressure turbine: roughness modeling and the effects on boundary layer transition and losses

Large eddy simulations of a linear low-pressure turbine cascade with the T106A profile and different surface roughness patches were carried out. The aim was to investigate the effects on the laminar and turbulent boundary layer on the blade suction surface. Two different approaches were used to represent the roughness patches. Firstly, a forcing model, reducing the computational costs compared to fully resolved roughness surfaces, was incorporated. Secondly, an immersed boundary method representing an as-cast roughness surface was used, for a more detailed analysis of flow mechanisms over roughness. It was found that the roughness model was able to induce boundary layer transition and alter the turbulent boundary layer, with the results in line with findings in the literature. The instantaneous flow data at different time instants of the as-cast roughness case showed the development of streaks due to distinct roughness peaks, resulting in highly uneven transition positions across the spanwise direction.

American Society Of Mechanical Engineers (ASME)
Hammer, F.
6d1de8ae-6f72-48b4-9293-7a6db2114f08
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Sandberg, Richard D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa
Hammer, F.
6d1de8ae-6f72-48b4-9293-7a6db2114f08
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Sandberg, Richard D.
41d03f60-5d12-4f2d-a40a-8ff89ef01cfa

Hammer, F., Sandham, Neil D. and Sandberg, Richard D. (2018) Large eddy simulations of a low-pressure turbine: roughness modeling and the effects on boundary layer transition and losses. In Turbomachinery. vol. 2B-2018, American Society Of Mechanical Engineers (ASME).. (doi:10.1115/GT2018-75796).

Record type: Conference or Workshop Item (Paper)

Abstract

Large eddy simulations of a linear low-pressure turbine cascade with the T106A profile and different surface roughness patches were carried out. The aim was to investigate the effects on the laminar and turbulent boundary layer on the blade suction surface. Two different approaches were used to represent the roughness patches. Firstly, a forcing model, reducing the computational costs compared to fully resolved roughness surfaces, was incorporated. Secondly, an immersed boundary method representing an as-cast roughness surface was used, for a more detailed analysis of flow mechanisms over roughness. It was found that the roughness model was able to induce boundary layer transition and alter the turbulent boundary layer, with the results in line with findings in the literature. The instantaneous flow data at different time instants of the as-cast roughness case showed the development of streaks due to distinct roughness peaks, resulting in highly uneven transition positions across the spanwise direction.

Full text not available from this repository.

More information

Published date: 2018
Venue - Dates: ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018, Norway, 2018-06-10 - 2018-06-14

Identifiers

Local EPrints ID: 425164
URI: http://eprints.soton.ac.uk/id/eprint/425164
PURE UUID: 50c9d0f0-5da1-45d4-9683-0015726c9ac8
ORCID for Neil D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944
ORCID for Richard D. Sandberg: ORCID iD orcid.org/0000-0001-5199-3944

Catalogue record

Date deposited: 11 Oct 2018 16:30
Last modified: 07 Oct 2020 01:42

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