The Role of Tip Leakage Flow in Spike-Type Rotating Stall Inception
This paper describes the role of tip leakage flow in creating the leading edge separation necessary for the onset of spike-Type compressor rotating stall. A series of unsteady multi-passage simulations, supported by experimental data, are used to define and illustrate the two competing mechanisms th...
| Main Authors: | , , , , |
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| Format: | Article |
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ASME International
2018
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| Online Access: | http://hdl.handle.net/1721.1/116269 https://orcid.org/0000-0001-9625-1020 https://orcid.org/0000-0003-2167-9860 |
| _version_ | 1811094424161091584 |
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| author | Hewkin-Smith, M. Pullan, G. Grimshaw, S. D. Greitzer, Edward M Spakovszky, Zoltan S |
| author2 | Massachusetts Institute of Technology. Department of Aeronautics and Astronautics |
| author_facet | Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Hewkin-Smith, M. Pullan, G. Grimshaw, S. D. Greitzer, Edward M Spakovszky, Zoltan S |
| author_sort | Hewkin-Smith, M. |
| collection | MIT |
| description | This paper describes the role of tip leakage flow in creating the leading edge separation necessary for the onset of spike-Type compressor rotating stall. A series of unsteady multi-passage simulations, supported by experimental data, are used to define and illustrate the two competing mechanisms that cause the high incidence responsible for this separation: blockage from a casing-suction-surface corner separation and forward spillage of the tip leakage jet. The axial momentum flux in the tip leakage flow determines which mechanism dominates. At zero tip clearance, corner separation blockage dominates. As the clearance is increased, the leakage flow reduces the blockage, moving the stall flow coefficient to lower flow, i.e., giving a larger unstalled flow range. Increased clearance, however, means an increase in leakage jet momentum and the contribution to leakage jet spillage. There is thus a clearance above which jet spillage dominates in creating incidence, so the stall flow coefficient increases and the flow range decreases with clearance. As a consequence there is a clearance for maximum flow range; for the two rotors in this study, the value was approximately 0.5%chord. The chord-wise distribution of the leakage axial momentum is also important in determining stall onset. Shifting the distribution towards the trailing edge increases the flow range of a leakage jet dominated geometry and reduces the flow range of a corner separation dominated geometry. Guidelines are developed for flow range enhancement through control of tip leakage flow axial momentum magnitude and distribution. An example is given of how this might be achieved. Topics: Stall inception, Leakage flows |
| first_indexed | 2024-09-23T15:59:50Z |
| format | Article |
| id | mit-1721.1/116269 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T15:59:50Z |
| publishDate | 2018 |
| publisher | ASME International |
| record_format | dspace |
| spelling | mit-1721.1/1162692022-09-29T17:35:41Z The Role of Tip Leakage Flow in Spike-Type Rotating Stall Inception Hewkin-Smith, M. Pullan, G. Grimshaw, S. D. Greitzer, Edward M Spakovszky, Zoltan S Massachusetts Institute of Technology. Department of Aeronautics and Astronautics Greitzer, Edward M Spakovszky, Zoltan S This paper describes the role of tip leakage flow in creating the leading edge separation necessary for the onset of spike-Type compressor rotating stall. A series of unsteady multi-passage simulations, supported by experimental data, are used to define and illustrate the two competing mechanisms that cause the high incidence responsible for this separation: blockage from a casing-suction-surface corner separation and forward spillage of the tip leakage jet. The axial momentum flux in the tip leakage flow determines which mechanism dominates. At zero tip clearance, corner separation blockage dominates. As the clearance is increased, the leakage flow reduces the blockage, moving the stall flow coefficient to lower flow, i.e., giving a larger unstalled flow range. Increased clearance, however, means an increase in leakage jet momentum and the contribution to leakage jet spillage. There is thus a clearance above which jet spillage dominates in creating incidence, so the stall flow coefficient increases and the flow range decreases with clearance. As a consequence there is a clearance for maximum flow range; for the two rotors in this study, the value was approximately 0.5%chord. The chord-wise distribution of the leakage axial momentum is also important in determining stall onset. Shifting the distribution towards the trailing edge increases the flow range of a leakage jet dominated geometry and reduces the flow range of a corner separation dominated geometry. Guidelines are developed for flow range enhancement through control of tip leakage flow axial momentum magnitude and distribution. An example is given of how this might be achieved. Topics: Stall inception, Leakage flows 2018-06-12T17:25:03Z 2018-06-12T17:25:03Z 2017-06 2018-03-20T16:54:24Z Article http://purl.org/eprint/type/ConferencePaper 978-0-7918-5081-7 http://hdl.handle.net/1721.1/116269 Hewkin-Smith, M., et al. "The Role of Tip Leakage Flow in Spike-Type Rotating Stall Inception." ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, 26-30 June, 2017, Charlotte, North Carolina, ASME, 2017, p. V02DT46A009. Copyright © 2017 ASME. https://orcid.org/0000-0001-9625-1020 https://orcid.org/0000-0003-2167-9860 http://dx.doi.org/10.1115/GT2017-63655 Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Volume 2D: Turbomachinery Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf ASME International ASME |
| spellingShingle | Hewkin-Smith, M. Pullan, G. Grimshaw, S. D. Greitzer, Edward M Spakovszky, Zoltan S The Role of Tip Leakage Flow in Spike-Type Rotating Stall Inception |
| title | The Role of Tip Leakage Flow in Spike-Type Rotating Stall Inception |
| title_full | The Role of Tip Leakage Flow in Spike-Type Rotating Stall Inception |
| title_fullStr | The Role of Tip Leakage Flow in Spike-Type Rotating Stall Inception |
| title_full_unstemmed | The Role of Tip Leakage Flow in Spike-Type Rotating Stall Inception |
| title_short | The Role of Tip Leakage Flow in Spike-Type Rotating Stall Inception |
| title_sort | role of tip leakage flow in spike type rotating stall inception |
| url | http://hdl.handle.net/1721.1/116269 https://orcid.org/0000-0001-9625-1020 https://orcid.org/0000-0003-2167-9860 |
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