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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.12 No.3
- 발행연도
- 2019.9
- 수록면
- 200 - 216 (17page)
- DOI
- 10.5293/IJFMS.2019.12.3.200
이용수
초록· 키워드
오류제보하기
Francis turbines with high specific speed may produce intense pulsations of system pressure when operating at approximately 70-85% of best-efficiency discharge. Frequencies between 1 and 4 times runner rotation are typical. The paper recalls and explains the particular set of properties. The pulsation is due to instability of the second-lowest eigenmode of the hydraulic system containing a cavitating draft tube vortex. A 1D model in frequency domain is used - with emphasis on the crucial role of the finite velocity of swirl propagation - to show how this mode can become unstable and give rise to a strong ‘breathing’ pulsation. A parameter study shows the well-known influence of draft tube pressure and why the behavior of prototype turbines is often different from the reduced-scale model. Some of the phase properties are explained by a 2D acoustic model. The phase reversal between upstream and downstream pressures is a consequence of the mode shape, with roughly two quarter waves of pressure along the cavitating vortex rope. The stability is quite sensitive to 2D effects; therefore the present 1D model, while useful for understanding the phenomena, is not likely to permit reliable predictions.
목차
Abstract
1. Introduction
2. Characteristic Properties of the High-partial-load Pulsation
3. A 1D Model for Stability Analysis
4. Quantitative Examples
5. 2D Vortex Models
6. Parameter studies
7. Conclusion
References
참고문헌 (26)
참고문헌 신청
Dörfler P K / 2018 / Analysis of the Francis turbine upper-part-load pulsation, Part I – Experimental results vs. hydro-acoustic model / 29th IAHR Symp. Hydr. Machinery and Systems
Dörfler P K / 2018 / Analysis of the Francis turbine upper-part-load pulsation, Part II – Mechanism of Self-Excitation / IAHR 29th Symp. Hydr Machinery and Systems
Dörfler P K / 2013 / Flow-Induced Pulsation and Vibration in Hydroelectric Machinery / Springer
Jacob Th / 1990 / Generation of hydro-acoustic disturbances by a Francis turbine model and dynamic behavior analysis / Proc. 15th Symp IAHR Section Hydr Machinery and Cavitation
Dörfler P K / 1993 / Observation of pressure pulsations at high partial load on a Francis model turbine with high specific speed / IAHR Work Group 1 (The Behavior of Hydraulic Machinery under Steady Oscillatory Conditions) 6th Meeting
Dörfler P K / 2018 / Analysis of the Francis turbine upper-part-load pulsation, Part II – Mechanism of Self-Excitation / IAHR 29th Symp. Hydr Machinery and Systems
Dörfler P K / 2013 / Flow-Induced Pulsation and Vibration in Hydroelectric Machinery / Springer
Jacob Th / 1990 / Generation of hydro-acoustic disturbances by a Francis turbine model and dynamic behavior analysis / Proc. 15th Symp IAHR Section Hydr Machinery and Cavitation
Dörfler P K / 1993 / Observation of pressure pulsations at high partial load on a Francis model turbine with high specific speed / IAHR Work Group 1 (The Behavior of Hydraulic Machinery under Steady Oscillatory Conditions) 6th Meeting
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