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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.9 No.2
- 발행연도
- 2016.6
- 수록면
- 182 - 193 (12page)
이용수
초록· 키워드
오류제보하기
Introduction of intermittent electricity production systems like wind and solar power to electricity market together with the deregulation of electricity markets resulted in numerous start/stops, load variations and off-design operation of water turbines. Hydraulic turbines suffer from the varying loads exerted on their stationary and rotating parts during load variations since they are not designed for such operating conditions. Investigations on part load operation of single regulated turbines, i.e., Francis and propeller, proved the formation of a rotating vortex rope (RVR) in the draft tube. The RVR induces pressure pulsations in the axial and rotating directions called plunging and rotating modes, respectively. This results in oscillating forces with two different frequencies on the runner blades, bearings and other rotating parts of the turbine. This study investigates the effect of transient operations on the pressure fluctuations exerted on the runner and mechanism of the RVR formation/mitigation. Draft tube and runner blades of the Porjus U9 model, a Kaplan turbine, were equipped with pressure sensors for this purpose. The model was run in off-cam mode during different load variations. The results showed that the transients between the best efficiency point and the high load occurs in a smooth way. However, during transitions to the part load a RVR forms in the draft tube which induces high level of fluctuations with two frequencies on the runner; plunging and rotating mode. Formation of the RVR during the load rejections coincides with sudden pressure change on the runner while its mitigation occurs in a smooth way.
목차
Abstract
1. Introduction
2. Experiments and experimental setup
3. Data Analysis
4. Results and Discussion
5. Conclusion
References
참고문헌 (16)
참고문헌 신청
[학술지(정기간행물)] - Houde, S. / 2012 / Experimental study of the pressure fluctuations on propeller turbine runner blades: part 2, transient conditions / Earth and Environmental Science 15 : 062061 ~
[학술대회논문] - Gagnon, M. / 2013 / Transient response and life assessment: Case studies on the load rejection of two hydroelectric turbines / Proceedings of the International Conference Surveillance : 1 ~ 11
[학술지(정기간행물)] - Gagnon, M. / 2010 / Impact of startup scheme on Francis runner life expectancy / Earth and Environmental Science 12 : 012107 ~
[학술지(정기간행물)] - Trivedi, C. / 2012 / Effect of transients on Francis turbine runner life: a review / Journal of Hydraulic Research 51 (2) : 121 ~ 132
[학술지(정기간행물)] - Kishor, N. / 2007 / A review on hydropower plant models and control / Renewable and Sustainable Energy Reviews 11 (5) : 776 ~ 796
[학술대회논문] - Gagnon, M. / 2013 / Transient response and life assessment: Case studies on the load rejection of two hydroelectric turbines / Proceedings of the International Conference Surveillance : 1 ~ 11
[학술지(정기간행물)] - Gagnon, M. / 2010 / Impact of startup scheme on Francis runner life expectancy / Earth and Environmental Science 12 : 012107 ~
[학술지(정기간행물)] - Trivedi, C. / 2012 / Effect of transients on Francis turbine runner life: a review / Journal of Hydraulic Research 51 (2) : 121 ~ 132
[학술지(정기간행물)] - Kishor, N. / 2007 / A review on hydropower plant models and control / Renewable and Sustainable Energy Reviews 11 (5) : 776 ~ 796
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UCI(KEPA) : I410-ECN-0101-2018-554-001894260