To clearly clarify how it affects the detailed tip clearance flow and flow mechanism by varying the upstream boundary layer thickness and tip clearance size, numerical studies were performed on a subsonic rotor, which is used for low-speed model testing of one rear stage embedded in a modern high-pressure compressor. Firstly, available experimental data were adopted to validate the numerical method. Second, comparisons were made for tip leakage vortex structure, the interface of leakage flow/mainflow, endwall loss, isentropic efficiency and pressure-rise between different operating conditions. Then, effects of different clearance sizes and inlet boundary layer thicknesses were investigated. At last, the self-induced unsteadiness at one near-stall operating condition was studied for different cases. Results show that increasing the tip clearance size has a deleterious effect on rotor efficiency and pressure-rise performance over the whole operating range, while thickening the inflow boundary layer is almost the same except that its pressure-rise performance will be increased at mass flow rate larger than design operating condition. Self-induced unsteadiness occurs at near-stall operating conditions, and its appearance depends largely on tip clearance size, while upstream boundary layer thickness has little effect.
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ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
June 16–20, 2014
Düsseldorf, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4560-8
PROCEEDINGS PAPER
Study on the Effects of Upstream Flow Conditions and Clearance Sizes to Tip Leakage Flow in a Subsonic Large-Scale Rotor
Chenkai Zhang,
Chenkai Zhang
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
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Jun Hu,
Jun Hu
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
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Zhiqiang Wang,
Zhiqiang Wang
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
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Ning Ding,
Ning Ding
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
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Zhiming Mao,
Zhiming Mao
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
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Zehua Chen
Zehua Chen
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
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Chenkai Zhang
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
Jun Hu
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
Zhiqiang Wang
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
Ning Ding
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
Zhiming Mao
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
Zehua Chen
Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
Paper No:
GT2014-26573, V02AT37A042; 10 pages
Published Online:
September 18, 2014
Citation
Zhang, C, Hu, J, Wang, Z, Ding, N, Mao, Z, & Chen, Z. "Study on the Effects of Upstream Flow Conditions and Clearance Sizes to Tip Leakage Flow in a Subsonic Large-Scale Rotor." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 2A: Turbomachinery. Düsseldorf, Germany. June 16–20, 2014. V02AT37A042. ASME. https://doi.org/10.1115/GT2014-26573
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