Abstract
Penetration of the power generated using wind and solar energy to electrical grid network causing several incidents of the grid tripping, power outage, and frequency drooping. This has increased restart (star-stop) cycles of the hydroelectric turbines significantly since grid connected hydroelectric turbines are widely used to manage critical conditions of the grid. Each cycle induces significant stresses due to unsteady pressure loading on the runner blades. The presented work investigates the pressure loading to a high head (H P = 377 D P = 1.78 m) Francis turbine during start-stop. The measurements were carried out on a scaled model turbine (H M = 12.5 D M = 0.349 m). Total four operating points were considered. At each operating point, three schemes of guide vanes opening and three schemes of guide vanes closing were investigated. The results show that total head variation is up to 9% during start-stop of the turbine. On the runner blade, the maximum pressure amplitudes are about 14 kPa and 16 kPa from the instantaneous mean value of 121 kPa during rapid start-up and shutdown, respectively, which are about 1.5 times larger than that of the slow start-up and shutdown. Moreover, the maximum pressure fluctuations are given at the blade trailing edge.
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09 October 2018
This corrects the article ?Experimental investigations of transient pressure variations in a high head model Francis turbine during start-up and shutdown? in volume 26, issue 2 on page 277.
17 October 2018
This corrects the article ���Experimental investigations of transient pressure variations in a high head model Francis turbine during start-up and shutdown��� in volume 26, issue 2 on page 277.
In the published article ���Vaginal adhesions in a woman with the history of dystocia. Journal of Hydrodynamics, 2014, 26(2): 277���290. 10.1016/S1001-6058(14)60031-7,��� the spell of author's name is given incorrectly. The Editorial Office of Journal of Hydrodynamics would like to correct the author's name. The Editorial Office apologizes for any inconvenience that it may have caused.
Chirag Trivedi, Michel J. Cervantes, B. K. Gandhi, Dahlhaug G. Ole
The author list should be corrected as follows: Chirag Trivedi, Michel J. Cervantes, B. K. Gandhi, Ole Gunnar Dahlhaug
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Biography: TRIVEDI Chirag, Ph. D. Candidate
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Trivedi, C., Cervantes, M.J., Gandhi, B.K. et al. Experimental investigations of transient pressure variations in a high head model Francis turbine during start-up and shutdown. J Hydrodyn 26, 277–290 (2014). https://doi.org/10.1016/S1001-6058(14)60031-7
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DOI: https://doi.org/10.1016/S1001-6058(14)60031-7