The hysteretic behavior of Wells turbines is a well-recognized phenomenon. As it appears at nondimensional frequencies orders of magnitude lower than the ones studied in rapidly pitching airfoils and wings, the cause is likely to be different. Some authors found its origin in the interaction between secondary flow structures and trailing edge vortices. In this work, a detailed numerical analysis of the performance of a Wells turbine submitted to a sinusoidal bidirectional flow is presented. Computational results are compared with experimental data available from literature and suggest a new explanation of the phenomenon.
Physical Explanation of the Hysteresis in Wells Turbines: A Critical Reconsideration
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received December 7, 2015; final manuscript received March 15, 2016; published online July 15, 2016. Assoc. Editor: Kwang-Yong Kim.
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Ghisu, T., Puddu, P., and Cambuli, F. (July 15, 2016). "Physical Explanation of the Hysteresis in Wells Turbines: A Critical Reconsideration." ASME. J. Fluids Eng. November 2016; 138(11): 111105. https://doi.org/10.1115/1.4033320
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