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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.8 No.3
- 발행연도
- 2015.9
- 수록면
- 155 - 168 (14page)
- DOI
- http://dx.doi.org/10.5293/IJFMS.2015.8.3.155
이용수
초록· 키워드
오류제보하기
No-load speed is an important performance factor for the safe operation of hydropower systems. In turbine design, the manufacturers must conduct several model tests to calculate the accurate value of no-load speed for the complete range of operating conditions, which are expensive and time-consuming. The present study presents steady and unsteady methods for calculating no-load speed of a Francis turbine. The steady simulations are implemented using a commercial flow solver and an iterative algorithm that relies on a smooth relation between turbine torque and speed factor. The unsteady method uses unsteady RANS simulations that have been integrated with a user subroutine to compute and return the value of runner speed, time step and friction torque. The main goal of this research is to evaluate and compare the two methods by calculating turbine dynamic parameters for three test cases consisting of high and medium head Francis turbines. Overall, the numerical results agreed well with experimental data. The unsteady method provided more accurate results in the opening angle range from 20 to 26 degrees. Nevertheless, the steady results showed more consistency than unsteady results for the three different test cases at different operating conditions.
목차
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참고문헌 (18)
참고문헌 신청
[학술대회논문] - Nicolet, C. / 2004 / Identification and Modeling of Pressure Fluctuations of a Francis Turbine Scale Model at Part Load Operation / Proceedings of the 22nd IAHR Symposium on Hydraulic Machinery and Systems
[학술대회논문] - Vu, T. C. / 2002 / Accuracy assessment of current CFD tools to predict hydraulic turbine efficiency hill chart / Proceedings of the 21st IAHR Symposium on Hydraulic Machinery and Systems : 193 ~ 198
[학술지(정기간행물)] - Vu, T. C. / 2011 / Steady and unsteady flow computation in an elbow draft tube with experimental validation / International Journal of Fluid Machinery and Systems 4 (1) : 85 ~ 96
[학술지(정기간행물)] - Melot, M. / 2014 / A new standard Francis runner design procedure to predict static stresses stresses at speed-no-load / Hydropower Dams (1)
[학술지(정기간행물)] - Hosseinimanesh, H. / 2014 / A steady-state simulation methodology for predicting runaway speed in Francis turbines / IOP Conference Series: Earth and Environmental Science 16 (3) : 032044 ~
[학술대회논문] - Vu, T. C. / 2002 / Accuracy assessment of current CFD tools to predict hydraulic turbine efficiency hill chart / Proceedings of the 21st IAHR Symposium on Hydraulic Machinery and Systems : 193 ~ 198
[학술지(정기간행물)] - Vu, T. C. / 2011 / Steady and unsteady flow computation in an elbow draft tube with experimental validation / International Journal of Fluid Machinery and Systems 4 (1) : 85 ~ 96
[학술지(정기간행물)] - Melot, M. / 2014 / A new standard Francis runner design procedure to predict static stresses stresses at speed-no-load / Hydropower Dams (1)
[학술지(정기간행물)] - Hosseinimanesh, H. / 2014 / A steady-state simulation methodology for predicting runaway speed in Francis turbines / IOP Conference Series: Earth and Environmental Science 16 (3) : 032044 ~
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UCI(KEPA) : I410-ECN-0101-2018-554-001912261