The behavior of tip clearance flow at near-stall condition in a transonic axial compressor rotor

K. Yamada, K. Funazaki, M. Furukawa

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

48 被引用数 (Scopus)

抄録

It is known that the tip clearance flow is dominant and very important flow phenomena in axial compressor aerodynamics because the tip clearance flow has a great influence on the stability as well as aerodynamic loss of compressors. Our goal is to clarify the behavior of tip clearance flow at near-stall condition in a transonic axial compressor rotor (NASA Rotor 37). In the present work, steady and unsteady RANS simulations were performed to investigate vortical flow structures and separated flow field near the tip for several different clearance cases. Boundary layer separation on the casing wall and blade suction surface was investigated in detail for near-stall and stall condition. In order to understand such complicated flow field, vortex cores were identified using the critical point theory and a topology of the three-dimensional separated and vortical flows was analyzed. In the nominal clearance case, the breakdown of tip leakage vortex has occurred at a near-stall operating condition because of the interaction of the vortex with the shock wave, leading to a large blockage and unsteadiness in the rotor tip. On the other hand, the calculation with no clearance suggested that the separation on the suction surface was different from that with the nominal clearance. Since the shock wave induced the boundary layer separation on the blade suction surface in the transonic axial compressor rotor, focal-type critical points appeared on the suction surface near the tip at near-stall condition.

本文言語英語
ホスト出版物のタイトルProceedings of the ASME Turbo Expo 2007 - Power for Land, Sea, and Air
ページ295-306
ページ数12
DOI
出版ステータス出版済み - 9 25 2007
イベント2007 ASME Turbo Expo - Montreal, Que., カナダ
継続期間: 5 14 20075 17 2007

出版物シリーズ

名前Proceedings of the ASME Turbo Expo
6 PART A

その他

その他2007 ASME Turbo Expo
Countryカナダ
CityMontreal, Que.
Period5/14/075/17/07

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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