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논문 기본 정보

자료유형
학술저널
저자정보
Qingsheng Wei (Mokpo National University) Baoshan Zhu (Tsinghua University) Young-Do Choi (Mokpo National University)
저널정보
한국마린엔지니어링학회 Journal of Advanced Marine Engineering and Technology (JAMET) 한국마린엔지니어링학회지 제36권 제5호
발행연도
2012.7
수록면
618 - 626 (9page)

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Suppression of abnormal flow phenomena in the Francis hydro turbine is very important to improve the turbine performance. Especially, as cavitation and cavitation surge makes serious problems when the turbine is operated in the range of partial flow rate, optimum method of suppressing the abnormal flow characteristics is required necessarily. Moreover, as swirl flow in the draft tube of the Francis turbine decreases pressure at the inlet of the draft tube, suppression of the swirl flow can be an useful method of suppressing the occurrence of cavitation. In order to clarifying the possibility of suppressing the swirl flow by J-Groove in the draft tube, a series of CFD analysis has been conducted in the range of partial load, designed condition and excessive flow rate of a Francis turbine. A kind of J-Groove is designed and applied to the draft tube of the Francis hydro turbine model. The pressure contours, circumferential velocity vectors and vortex core regions in the draft tube are compared by the conditions with or without J-Groove. In addition, a group of data about the velocity in the draft is presented to show the influence of J-Groove.

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Abstract
Nomenclatur
1. Introduction
2. Turbine model and J-Grooveconfiguration
3. Numerical Methods
4. Results and Discussion
5. Conclusions
Acknowledgments
References

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UCI(KEPA) : I410-ECN-0101-2013-559-003550097