Three-dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1999.
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | eng |
| Published: |
Massachusetts Institute of Technology
2005
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/1721.1/8183 |
| _version_ | 1826209906665979904 |
|---|---|
| author | Gordon, Kenneth A. (Kenneth Andrew), 1970- |
| author2 | Choon S. Tan. |
| author_facet | Choon S. Tan. Gordon, Kenneth A. (Kenneth Andrew), 1970- |
| author_sort | Gordon, Kenneth A. (Kenneth Andrew), 1970- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1999. |
| first_indexed | 2024-09-23T14:34:49Z |
| format | Thesis |
| id | mit-1721.1/8183 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T14:34:49Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/81832019-04-10T21:35:28Z Three-dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors Gordon, Kenneth A. (Kenneth Andrew), 1970- Choon S. Tan. Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. Aeronautics and Astronautics. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1999. "June 1999." Includes bibliographical references (p. 383-388). The effects of two types of flow nonuniformity on stall inception behavior were assessed with linearized stability analyses of two compressor flow models. Response to rotating tip clearance asymmetries induced by a whirling rotor shaft or rotor height variations were investigated with a two-dimensional flow model. A 3-D compressor model was also developed to study the stability of both full-span and part-span rotating stall modes in annular geometries with radial flow variations. The studies focussed on (1) understanding what compressor designs were sensitive to these types of circumferential and spanwise flow nonuniformities, and (2) situations where 2-D stability theories were inadequate because of 3-D flow effects. Rotating tip clearance nonuniformities caused the greatest performance loss for shafts whirling at the rotating stall frequency. A whirling shaft displacement of 1% chord caused the stalling mass flow to rise by as much as 10% and the peak pressure rise to decrease by 6%. These changes were an order of magnitude larger than for equivalent-sized stationary or rotor-locked clearance asymmetries. Spanwise flow nonuniformities always destabilized the compressor, so that 2-D models over-predicted the stall margin compared to 3-D theory. The difference increased for compressors with larger spanwise variations of characteristic slope and reduced characteristic curvature near the peak. Differences between 2-D and 3-D stall point predictions were generally unacceptable (2-4% of flow coefficient) for single-stage configurations, but were less than 1% for multistage compressors. 2-D analyses predicted the wrong stall mode for specific cases of radial inlet flow distortion, mismatching and annulus area contraction, where higher-order radial modes led to stall. (cont.) The stability behavior of flows with circumferential or radial nonuniformity was unified through a single stability criterion. The stall point for both cases was set by the integral around the annulus of the pressure rise characteristic slope, weighted by the amplitude of the mode shape. For the case of steady circumferential variations, this criterion reduced to the integrated mean slope (IMS) condition associated with steady inlet distortions. The rotating tip clearance asymmetry model was also used to demonstrate the feasibility of actively controlling the shaft position to suppress rotating stall. In axisymmetric mean flow, this method only stabilized the first harmonic mode, increasing the operating range until surge or higher harmonic modes became unstable. by Kenneth A. Gordon. Ph.D. 2005-08-23T18:06:32Z 2005-08-23T18:06:32Z 1999 Thesis http://hdl.handle.net/1721.1/8183 50047655 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 388 p. 23779486 bytes 23779245 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Aeronautics and Astronautics. Gordon, Kenneth A. (Kenneth Andrew), 1970- Three-dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors |
| title | Three-dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors |
| title_full | Three-dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors |
| title_fullStr | Three-dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors |
| title_full_unstemmed | Three-dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors |
| title_short | Three-dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors |
| title_sort | three dimensional rotating stall inception and effects of rotating tip clearance asymmetry in axial compressors |
| topic | Aeronautics and Astronautics. |
| url | http://hdl.handle.net/1721.1/8183 |
| work_keys_str_mv | AT gordonkennethakennethandrew1970 threedimensionalrotatingstallinceptionandeffectsofrotatingtipclearanceasymmetryinaxialcompressors |