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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
- 학술대회자료
- 저자정보
- 발행연도
- 2004.10
- 수록면
- 385 - 392 (8page)
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초록· 키워드
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An objective of this study is an understanding of effect of inlet flow angle on the output power performance of Francis hydraulic turbine. An optimum induced angle at the inlet of the turbine is one of the most important design parameters to keep its best performance at a given operating condition. In general, a rotating speed of the turbine is varied with the change of water mass flowrate in a volute and water level in a reservoir. The induced angle of the inlet water into the turbine should be properly adjusted to the operating condition to have maximum energy conversion efficiency of the turbine.
In this study, a numerical simulation was conducted to have detail understanding of the flow phenomenon in the flow path of the hydraulic turbine. The results were analyzed to have variation of power performance of the model turbine with the change of induced angle. Indicated power produced by the model turbine at a given operating condition was found numerically and compared to the brake power of the turbine measured by experiment. From the comparison of two results, the turbine efficiency or the energy conversion efficiency of the model turbine could be estimated. From this study, it was found that the rotating power of the turbine linearly increases with respect to the rotating speed. It means that the higher volume flow rate supplied, the bigger torque generated on the turbine shaft. The maximum brake efficiency of the turbine is around 46％ at 35 degree of induced angle. The difference between numerical and experimental output of the model turbine is defined as mechanical efficiency. The maximum mechanical efficiency of the turbine is around 93％ at 25-30 degree of induced angle.
In this study, a numerical simulation was conducted to have detail understanding of the flow phenomenon in the flow path of the hydraulic turbine. The results were analyzed to have variation of power performance of the model turbine with the change of induced angle. Indicated power produced by the model turbine at a given operating condition was found numerically and compared to the brake power of the turbine measured by experiment. From the comparison of two results, the turbine efficiency or the energy conversion efficiency of the model turbine could be estimated. From this study, it was found that the rotating power of the turbine linearly increases with respect to the rotating speed. It means that the higher volume flow rate supplied, the bigger torque generated on the turbine shaft. The maximum brake efficiency of the turbine is around 46％ at 35 degree of induced angle. The difference between numerical and experimental output of the model turbine is defined as mechanical efficiency. The maximum mechanical efficiency of the turbine is around 93％ at 25-30 degree of induced angle.
목차
Abstract
1. Introduction
2. Fluid Flow Characteristics and Geometry of Model Turbine
3. Numerical Scheme and Boundary Conditions
4. Performance Analysis of Model Turbine
5. Results and Discussions
6. Conclusion
References
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