Probabilistic aerothermal design of compressor airfoils
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2005
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| Online Access: | http://hdl.handle.net/1721.1/16995 |
| _version_ | 1811070714278576128 |
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| author | Garzón, Víctor E., 1972- |
| author2 | David L. Darmofal. |
| author_facet | David L. Darmofal. Garzón, Víctor E., 1972- |
| author_sort | Garzón, Víctor E., 1972- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003. |
| first_indexed | 2024-09-23T08:40:24Z |
| format | Thesis |
| id | mit-1721.1/16995 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T08:40:24Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/169952019-04-09T19:08:09Z Probabilistic aerothermal design of compressor airfoils Garzón, Víctor E., 1972- David L. Darmofal. 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, 2003. Includes bibliographical references (p. 175-183). This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. Despite the generally accepted notion that geometric variability is undesirable in turbomachinery airfoils, little is known in detail about its impact on aerothermal compressor performance. In this work, statistical and probabilistic techniques were used to assess the impact of geometric and operating condition uncertainty on axial compressor performance. High-fidelity models of geometric variability were constructed from surface measurements of existing hardware using principal component analysis (PCA). A quasi-two-dimensional cascade analysis code, at the core of a parallel probabilistic analysis framework, was used to assess the impact of uncertainty on aerodynamic performance of compressor rotor airfoils. Three rotor blades with inlet relative Mach numbers of 0.82, 0.90 and 1.25 were considered. Discrepancies between nominal and mean loss (mean-shift) of up to 20% were observed. Loss and turning variability were found to grow linearly with geometric noise amplitude. A probabilistic, gradient-based approach to compressor blade optimization was presented. Probabilistic objectives, constraints and gradients are approximated using low-resolution Monte Carlo sampling. Test airfoils were optimized both deterministically and probabilistically and then analyzed probabilistically to account for geometric variability. Probabilistically redesigned airfoils exhibited reductions in mean loss of up to 25% and in loss variability of as much as 65% from corresponding values for deterministically redesigned airfoils. (cont.) A probabilistic mean-line multi-stage axial compressor model was used to estimate the impact of geometric variability on overall compressor performance. Probabilistic loss and turning models were exercised on a six-stage compressor model. At realistic levels of geometric variability, the mean polytropic efficiency was found to be upwards of 1% lower than nominal. Compressor simulations using airfoils redesigned probabilistically for minimum loss variability exhibited reductions of 30 to 40% in polytropic efficiency variability and mean shift. by Victor E. Garzon. Ph.D. 2005-05-19T15:34:54Z 2005-05-19T15:34:54Z 2003 2003 Thesis http://hdl.handle.net/1721.1/16995 54091886 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 183 p. 3018574 bytes 3018235 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Aeronautics and Astronautics. Garzón, Víctor E., 1972- Probabilistic aerothermal design of compressor airfoils |
| title | Probabilistic aerothermal design of compressor airfoils |
| title_full | Probabilistic aerothermal design of compressor airfoils |
| title_fullStr | Probabilistic aerothermal design of compressor airfoils |
| title_full_unstemmed | Probabilistic aerothermal design of compressor airfoils |
| title_short | Probabilistic aerothermal design of compressor airfoils |
| title_sort | probabilistic aerothermal design of compressor airfoils |
| topic | Aeronautics and Astronautics. |
| url | http://hdl.handle.net/1721.1/16995 |
| work_keys_str_mv | AT garzonvictore1972 probabilisticaerothermaldesignofcompressorairfoils |