Corner Separation Control Using a New Combined Slotted Configuration in a High-Turning Compressor Cascade under Different Solidities

Hejian Wang, Yanshan Qing, Bo Liu and Xiaochen Mao
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Hejian Wang: School of Power and Energy, Northwestern Polytechnical University, 1 Dongxiang Road, Chang’an District, Xi’an 710129, China
Yanshan Qing: Chinese People’s Liberation Army, No. 5719 Factory, 91 Baihe Road, Lichun District, Pengzhou 611936, China
Bo Liu: School of Power and Energy, Northwestern Polytechnical University, 1 Dongxiang Road, Chang’an District, Xi’an 710129, China
Xiaochen Mao: School of Power and Energy, Northwestern Polytechnical University, 1 Dongxiang Road, Chang’an District, Xi’an 710129, China

Energies, 2021, vol. 14, issue 12, 1-19

Abstract: In order to comprehensively control the corner separation and the blade trailing edge (TE) separation in a high-turning compressor stator cascade, this research proposes a new combined slotted configuration consisting of one full-span slot and two blade-end slots. Taking into account the effect of the blade solidity, the performance of the original cascade and the combined slotted cascade was calculated and evaluated in a wide incidence angle range at two blade solidities. The results indicated that the blade loading and the corner separation range of the original cascade becomes larger as the blade solidity decreases from 1.66 to 1.36, which leads to higher total pressure loss and lower pressure diffusing capacity under positive incidence angles. The low-momentum fluid in the boundary layer can be significantly re-energized by the high-momentum blade-end and full-span slots jets, hence the combined slotted configuration can eliminate the blade TE separation and reduce the corner separation remarkably in the full incidence angle range at the two blade solidities. By adopting the combined slotted configuration, the total pressure loss, turning angle and static pressure coefficient of the original cascade can be increased by −23.2%, 2.7° and 4.7% on average, respectively, when the blade solidity is 1.66, while they can be increased by −27.7%, 3.3° and 7.6% on average, respectively, when the blade solidity is 1.36. The combined slotted configuration has a significant adaptability to the low blade solidity (or high loading) condition and it shows a certain potential in increasing the aeroengine thrust-to-weight ratio by decreasing the compressor single-stage blade number.

Keywords: high-turning compressor stator cascade; full-span slot; blade-end slot; corner separation; pressure diffusing capacity; low blade solidity; aeroengine thrust-to-weight ratio (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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