Linne, Marius ; Ade, Dominik ; Eitenmüller, Johannes ; Leichtfuss, Sebastian ; Schiffer, Heinz-Peter ; Lyko, Christoph ; Schmid, Gregor (2023)
Investigation of the aerodynamic interaction between rotor and second stator in the large scale turbine rig.
ASME Turbo Expo 2023. Boston, Massachusetts, USA (26.06.2023 - 30.06.2023)
doi: 10.1115/GT2023-101246
Conference or Workshop Item, Bibliographie
Abstract
This paper presents the results of an investigation of two different interface modeling approaches for Computational Fluid Dynamics in turbomachinery and their influence on the second stator aerodynamics in the 1.5-stage Large Scale Turbine Rig. Highly accurate five-hole probe data as well as oil flow visualizations are used to investigate the aerodynamics within the second stator passage and to validate the numerical results. While unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations appear to be a better qualitative representation of the second stator aerodynamic experiments, the steady-state (RANS) simulation predicts a turbine efficiency that is closer to the experimental data. In both approaches, the boundary conditions, computational domain and turbulence parameters are kept the same. The key difference between the two simulations is the resolution of time and hence unsteady effects. The RANS approach uses a Mixing-Plane interface between stationary and rotating reference frames. Here, unsteady effects of blade row interaction are neglected by mixing flow quantities in the circumferential direction. This affects the development and propagation of the vortex system in the downstream blade row. To account for effects of rotor-stator-interaction and reduce modeling errors, more expensive unsteady simulations are used. In the rotor exit plane, the URANS simulation shows a better match with experimental data, which theoretically should be the more accurate inlet condition for the downstream second stator. Here, unsteady interactions between the vortex systems of the rotor and the second stator lead to an overprediction of the losses in the second stator passage in the URANS compared to the RANS case. Therefore, the overall efficiency is more accurately predicted by RANS.
| Item Type: | Conference or Workshop Item |
|---|---|
| Erschienen: | 2023 |
| Creators: | Linne, Marius ; Ade, Dominik ; Eitenmüller, Johannes ; Leichtfuss, Sebastian ; Schiffer, Heinz-Peter ; Lyko, Christoph ; Schmid, Gregor |
| Type of entry: | Bibliographie |
| Title: | Investigation of the aerodynamic interaction between rotor and second stator in the large scale turbine rig |
| Language: | English |
| Date: | June 2023 |
| Place of Publication: | New York |
| Publisher: | ASME |
| Book Title: | Turbo Expo: power for land, sea, and air. Volume 13B: Turbomachinery — axial flow turbine aerodynamics |
| Event Title: | ASME Turbo Expo 2023 |
| Event Location: | Boston, Massachusetts, USA |
| Event Dates: | 26.06.2023 - 30.06.2023 |
| DOI: | 10.1115/GT2023-101246 |
| Abstract: | This paper presents the results of an investigation of two different interface modeling approaches for Computational Fluid Dynamics in turbomachinery and their influence on the second stator aerodynamics in the 1.5-stage Large Scale Turbine Rig. Highly accurate five-hole probe data as well as oil flow visualizations are used to investigate the aerodynamics within the second stator passage and to validate the numerical results. While unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations appear to be a better qualitative representation of the second stator aerodynamic experiments, the steady-state (RANS) simulation predicts a turbine efficiency that is closer to the experimental data. In both approaches, the boundary conditions, computational domain and turbulence parameters are kept the same. The key difference between the two simulations is the resolution of time and hence unsteady effects. The RANS approach uses a Mixing-Plane interface between stationary and rotating reference frames. Here, unsteady effects of blade row interaction are neglected by mixing flow quantities in the circumferential direction. This affects the development and propagation of the vortex system in the downstream blade row. To account for effects of rotor-stator-interaction and reduce modeling errors, more expensive unsteady simulations are used. In the rotor exit plane, the URANS simulation shows a better match with experimental data, which theoretically should be the more accurate inlet condition for the downstream second stator. Here, unsteady interactions between the vortex systems of the rotor and the second stator lead to an overprediction of the losses in the second stator passage in the URANS compared to the RANS case. Therefore, the overall efficiency is more accurately predicted by RANS. |
| Identification Number: | Paper-ID: GT2023-101246 |
| Divisions: | 16 Department of Mechanical Engineering 16 Department of Mechanical Engineering > Institute of Gas Turbines and Aerospace Propulsion (GLR) 16 Department of Mechanical Engineering > Institute of Gas Turbines and Aerospace Propulsion (GLR) > Numerical Simulation 16 Department of Mechanical Engineering > Institute of Gas Turbines and Aerospace Propulsion (GLR) > Turbine 16 Department of Mechanical Engineering > Rolls-Royce University Technology Center Combustor Turbine Interaction (UTC) Zentrale Einrichtungen Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) Zentrale Einrichtungen > University IT-Service and Computing Centre (HRZ) > Hochleistungsrechner |
| Date Deposited: | 09 Oct 2024 09:55 |
| Last Modified: | 10 Oct 2024 12:05 |
| PPN: | 52208883X |
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