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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.18 No.1
- 발행연도
- 2025.3
- 수록면
- 37 - 47 (11page)
- DOI
- 10.5293/IJFMS.2025.18.1.037
이용수
초록· 키워드
오류제보하기
In order to analyze the flow characteristics of the internal flow field in the draft tube of the Francis turbine and reveal the coherent structure evolution, the flow in Francis-99 model turbine are simulated under three working conditions. The three-dimensional coherent structure and dynamic information of single fluctuation frequency in the draft tube under different working conditions are extracted based on numerical computation by dynamic mode decomposition (DMD) method. The averaged flow field (mode 0) occupy the most flow field energy (>96%), and the first 6th modes occupy more than 99.5% flow field energy, representing the dominant flow structure in draft tube. The spatial coherent structures of mode 1 to mode 6 show multiple spiral vortex ropes surrounding the center vortex rope of mode 0 coherent structure, and the number of the vortex ropes equal to mode number. The temporal evolutions of unsteady flow structures of modes with nonzero frequency repeat the cycle that, generating from the draft tube inlet, growing to entire flow passage downward, disappearing slowly and arising again.
목차
Abstract
1. Introductio
2. Physical model and numerical method
3. Draft tube velocity distribution verification
4. DMD analysis of draft tube flow field
5. Conclusions
Reference
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