STUDY OF THE VARIATION IN COMPONENT LEVEL CHARACTERISTICS OF A CENTRIFUGAL COMPRESSOR ACROSS THE COMPRESSOR MAP USING CFD AND EXPERIMENTS WITH DETAILED INSTRUMENTATION ON A GAS STAND
(2023) ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, GT 2023 In Proceedings of the ASME Turbo Expo 9.- Abstract
A compressor map with variations in component level characteristics is introduced. This novel approach to plot component level characteristics identify and give context to the critical design parameters such as flow angles, pressure coefficients, and loss coefficients across the entire compressor map along with the conventional performance parameters. Compressor design involves a significant amount of CFD at a stage level, but the decisive importance of component performance, design and analysis are many times overshadowed by 3D CFD, both steady RANS and unsteady RANS/LES/DES. Although the authors support the development of high-fidelity computational tools, validating these computational results with experimental measurements is... (More)
A compressor map with variations in component level characteristics is introduced. This novel approach to plot component level characteristics identify and give context to the critical design parameters such as flow angles, pressure coefficients, and loss coefficients across the entire compressor map along with the conventional performance parameters. Compressor design involves a significant amount of CFD at a stage level, but the decisive importance of component performance, design and analysis are many times overshadowed by 3D CFD, both steady RANS and unsteady RANS/LES/DES. Although the authors support the development of high-fidelity computational tools, validating these computational results with experimental measurements is essential. A detailed analysis of the Scania's in-house designed compressor stage tested in the Scania Gas stand shows that in order to create an optimal design, component level performance assessment is necessary for the impeller, diffuser and volute. The variation of performance parameters along a speed line and across varied tip speeds are shown along with indications for the onset of instabilities at a component level. This is a crucial input for the design of a compressor stage. In addition to detailed analysis of experimental results, this work includes predictions from two different CFD solvers and discussion of deviations between them. Both the CFD solvers can be used to predict performance parameters at a stage level for most parts of the map. For operating conditions close to surge and higher tip speeds (565 m/s), there are major deviations in the CFD solvers' predictions. The impeller pressure rise and efficiency could be predicted well with the CFD solvers for most of the tip speeds. However, deviations between measurements and predictions increase with increasing tip speeds. The diffuser performance is predicted well by one of the solvers. The other solver underpredicts the diffuser and overpredicts the volute performance. These are also important inputs for 1D design and also for positioning of the best characteristics on the compressor map for the optimal operation of the machine. The goal of this work is to quantify performance predictions on a component level accurately, so that stage level optimization is worth executing. Further, such validated models could aid reliable design predictions and an optimization of the entire compressor stage.
(Less)
- author
- Thiyagarajan, Janakiraman ; Genrup, Magnus LU ; Fredriksson, Carl ; Anton, Nicholas and Fridh, Jens
- organization
- publishing date
- 2023
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Centrifugal compressor, component level, Cp, design, diffuser, impeller, Lc, volute
- host publication
- Microturbines, Turbochargers, and Small Turbomachines; Oil and Gas Applications
- series title
- Proceedings of the ASME Turbo Expo
- volume
- 9
- article number
- v009t18a010
- publisher
- American Society Of Mechanical Engineers (ASME)
- conference name
- ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, GT 2023
- conference location
- Boston, United States
- conference dates
- 2023-06-26 - 2023-06-30
- external identifiers
-
- scopus:85177478518
- ISBN
- 9780791887035
- DOI
- 10.1115/GT2023-102869
- language
- English
- LU publication?
- yes
- additional info
- Funding Information: The authors would like to thank Scania CV AB for the financial support, Dr. Thomas Hällqvist, colleagues at the Engine development group at Scania R&D and also Dr. Anders Jäger, the group manager at Turbo development group for the necessary support and encouragement. Publisher Copyright: © 2023 American Society of Mechanical Engineers (ASME). All rights reserved.
- id
- d23ae3ca-cb5f-4582-80a9-878dd87586d8
- date added to LUP
- 2024-01-08 12:34:12
- date last changed
- 2024-01-08 12:34:58
@inproceedings{d23ae3ca-cb5f-4582-80a9-878dd87586d8,
abstract = {{<p>A compressor map with variations in component level characteristics is introduced. This novel approach to plot component level characteristics identify and give context to the critical design parameters such as flow angles, pressure coefficients, and loss coefficients across the entire compressor map along with the conventional performance parameters. Compressor design involves a significant amount of CFD at a stage level, but the decisive importance of component performance, design and analysis are many times overshadowed by 3D CFD, both steady RANS and unsteady RANS/LES/DES. Although the authors support the development of high-fidelity computational tools, validating these computational results with experimental measurements is essential. A detailed analysis of the Scania's in-house designed compressor stage tested in the Scania Gas stand shows that in order to create an optimal design, component level performance assessment is necessary for the impeller, diffuser and volute. The variation of performance parameters along a speed line and across varied tip speeds are shown along with indications for the onset of instabilities at a component level. This is a crucial input for the design of a compressor stage. In addition to detailed analysis of experimental results, this work includes predictions from two different CFD solvers and discussion of deviations between them. Both the CFD solvers can be used to predict performance parameters at a stage level for most parts of the map. For operating conditions close to surge and higher tip speeds (565 m/s), there are major deviations in the CFD solvers' predictions. The impeller pressure rise and efficiency could be predicted well with the CFD solvers for most of the tip speeds. However, deviations between measurements and predictions increase with increasing tip speeds. The diffuser performance is predicted well by one of the solvers. The other solver underpredicts the diffuser and overpredicts the volute performance. These are also important inputs for 1D design and also for positioning of the best characteristics on the compressor map for the optimal operation of the machine. The goal of this work is to quantify performance predictions on a component level accurately, so that stage level optimization is worth executing. Further, such validated models could aid reliable design predictions and an optimization of the entire compressor stage.</p>}},
author = {{Thiyagarajan, Janakiraman and Genrup, Magnus and Fredriksson, Carl and Anton, Nicholas and Fridh, Jens}},
booktitle = {{Microturbines, Turbochargers, and Small Turbomachines; Oil and Gas Applications}},
isbn = {{9780791887035}},
keywords = {{Centrifugal compressor; component level; Cp; design; diffuser; impeller; Lc; volute}},
language = {{eng}},
publisher = {{American Society Of Mechanical Engineers (ASME)}},
series = {{Proceedings of the ASME Turbo Expo}},
title = {{STUDY OF THE VARIATION IN COMPONENT LEVEL CHARACTERISTICS OF A CENTRIFUGAL COMPRESSOR ACROSS THE COMPRESSOR MAP USING CFD AND EXPERIMENTS WITH DETAILED INSTRUMENTATION ON A GAS STAND}},
url = {{http://dx.doi.org/10.1115/GT2023-102869}},
doi = {{10.1115/GT2023-102869}},
volume = {{9}},
year = {{2023}},
}