For pump turbines, an S-shaped curve can lead to failures in synchronization. To improve the hydraulic design, the component that is responsible for the formation of the S-shaped curve was identified by a hydraulic loss analysis using previous computational fluid dynamics (CFD) results, which indicates that the formation of the S-shaped curve can be ascribed to the runner. To improve the hydraulic design of the runner, a simple numerical approach for direct problem analysis was proposed, based on the blade-loading distributions of runners with and without an S-shaped curve, and directly analyzed. It was implied from the differences in the blade-loading distributions that, when the meridional passage was broadened, the formation of the S-shaped curve was suppressed. To validate this, two runners with different meridional sections were designed by means of the inverse design method. Through model tests, it was verified that the S-shaped curve was eliminated completely and the performance curve of the modified hydraulic model satisfied the requirements for safe operation in a pumped storage plant.
Hydraulic Improvement to Eliminate S-Shaped Curve in Pump Turbine
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 30, 2012; final manuscript received January 14, 2013; published online May 23, 2013. Assoc. Editor: Edward M. Bennett.
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Yin, J., Wang, D., Wei, X., and Wang, L. (May 23, 2013). "Hydraulic Improvement to Eliminate S-Shaped Curve in Pump Turbine." ASME. J. Fluids Eng. July 2013; 135(7): 071105. https://doi.org/10.1115/1.4023851
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