NUMERICAL ANALYSIS OF AN AXIAL HIGH PRESSURE PARTIAL ADMISSION TURBINE
(2022) ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition, GT 2022 In Proceedings of the ASME Turbo Expo 10-B.- Abstract
The transformation of the energy systems will call for new turbomachinery designs for harvesting low-grade heat. The word “low-grade” has many definitions and ranges from levels where steam is the preferred selection to very low grades where specially adopted ORC technology is used. In this work, turbomachinery for cascading the steam cycle with a very low-temperature ORC technology is studied. The steam turbine being investigated here is, in principle, a highly-loaded small backpressure turbine. One indeed important feature is the trade-off between losses related to partial arc admission and losses due to having very short blades. This sets the overall architecture of the turbine and is one of the most prominent selections during the... (More)
The transformation of the energy systems will call for new turbomachinery designs for harvesting low-grade heat. The word “low-grade” has many definitions and ranges from levels where steam is the preferred selection to very low grades where specially adopted ORC technology is used. In this work, turbomachinery for cascading the steam cycle with a very low-temperature ORC technology is studied. The steam turbine being investigated here is, in principle, a highly-loaded small backpressure turbine. One indeed important feature is the trade-off between losses related to partial arc admission and losses due to having very short blades. This sets the overall architecture of the turbine and is one of the most prominent selections during the design. Due to the special working/boundary conditions, a supersonic axial turbine model and partial-arc admission were necessary. Previous open literature had shown better performance with one admitted arc. A full three-dimensional analysis of such a turbine model using CFD techniques is rather challenging. Due to the special character of the supersonic flow and the interaction of possible shocks with boundary layer flow, a fine grid is required for this application. On the other hand, due to the unsymmetrical feature of the geometry imposed by the existence of only one blocked arc, modeling of the full annulus of the turbine is unavoidable. Computations are done to assess the characteristics of the flow inside threedimensional supersonic turbine using commercial CFD codes. The unsteady loads of the rotor blades are analyzed both in time and frequency domains.
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- author
- Hu, Heng LU ; Askebjer, Per ; Genrup, Magnus LU and Hushmandi, Narmin LU
- organization
- publishing date
- 2022
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- CFD, Partial Admission, Supersonic Axial Turbine, Unsteady loads
- host publication
- Turbomachinery - Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing; Radial Turbomachinery Aerodynamics
- series title
- Proceedings of the ASME Turbo Expo
- volume
- 10-B
- article number
- V10BT30A015
- publisher
- American Society Of Mechanical Engineers (ASME)
- conference name
- ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition, GT 2022
- conference location
- Rotterdam, Netherlands
- conference dates
- 2022-06-13 - 2022-06-17
- external identifiers
-
- scopus:85141405759
- ISBN
- 9780791886106
- DOI
- 10.1115/GT2022-81908
- language
- English
- LU publication?
- yes
- id
- aeaef3c6-de1f-4e38-953c-5b9b71acf5db
- date added to LUP
- 2022-12-09 10:10:37
- date last changed
- 2023-11-21 05:05:39
@inproceedings{aeaef3c6-de1f-4e38-953c-5b9b71acf5db,
abstract = {{<p>The transformation of the energy systems will call for new turbomachinery designs for harvesting low-grade heat. The word “low-grade” has many definitions and ranges from levels where steam is the preferred selection to very low grades where specially adopted ORC technology is used. In this work, turbomachinery for cascading the steam cycle with a very low-temperature ORC technology is studied. The steam turbine being investigated here is, in principle, a highly-loaded small backpressure turbine. One indeed important feature is the trade-off between losses related to partial arc admission and losses due to having very short blades. This sets the overall architecture of the turbine and is one of the most prominent selections during the design. Due to the special working/boundary conditions, a supersonic axial turbine model and partial-arc admission were necessary. Previous open literature had shown better performance with one admitted arc. A full three-dimensional analysis of such a turbine model using CFD techniques is rather challenging. Due to the special character of the supersonic flow and the interaction of possible shocks with boundary layer flow, a fine grid is required for this application. On the other hand, due to the unsymmetrical feature of the geometry imposed by the existence of only one blocked arc, modeling of the full annulus of the turbine is unavoidable. Computations are done to assess the characteristics of the flow inside threedimensional supersonic turbine using commercial CFD codes. The unsteady loads of the rotor blades are analyzed both in time and frequency domains.</p>}},
author = {{Hu, Heng and Askebjer, Per and Genrup, Magnus and Hushmandi, Narmin}},
booktitle = {{Turbomachinery - Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing; Radial Turbomachinery Aerodynamics}},
isbn = {{9780791886106}},
keywords = {{CFD; Partial Admission; Supersonic Axial Turbine; Unsteady loads}},
language = {{eng}},
publisher = {{American Society Of Mechanical Engineers (ASME)}},
series = {{Proceedings of the ASME Turbo Expo}},
title = {{NUMERICAL ANALYSIS OF AN AXIAL HIGH PRESSURE PARTIAL ADMISSION TURBINE}},
url = {{http://dx.doi.org/10.1115/GT2022-81908}},
doi = {{10.1115/GT2022-81908}},
volume = {{10-B}},
year = {{2022}},
}