Numerical analysis of a measured efficiency hysteresis on a bulb turbine model

Houde, Sébastien; Carrier, Alexandre; Buron, Jean-David; Deschênes, Claire

doi:10.1088/1755-1315/22/2/022009

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…cavitation bubbles 29 ) and many kinds of hydraulic machinery, e.g. bulb turbine 30 . Generally speaking, with the hysteresis effects, the current state of the system depends not only on the current input of the system but also on the history of the system.…”

Section: Hysteresis Effectsmentioning

confidence: 99%

A review of rotating stall in reversible pump turbine

Zhang

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

139

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Currently, operations of reversible pump turbines in pumped hydro energy storage plant suffer great instability problems in the well-known S-shaped characteristic regions, leading to the failure of start, significant pressure fluctuations, and severe vibrations of the whole system. One of the physical origins of the above instability of reversible pump turbines is the rotating stall phenomenon generated at off-design conditions in generating mode. In this review, recent studies on the rotating stall of reversible pump turbines are critically reviewed with a focus on the generating mode. In reversible pump turbine, the rotating stall initiates at runaway and is fully developed at low discharge condition with characteristic rotating frequency being 50-70% of the impeller rotational frequency. Notorious effects induced by rotating stall include generation of large pressure fluctuation, channel blockage, and strong backflow, all of which contribute significantly to the instability of reversible pump turbine. Methods for identification of rotating stall are also introduced with plenty of examples. Finally, several suggestions on the future work are given and discussed.

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Section: Hysteresis Effectsmentioning

confidence: 99%

A review of rotating stall in reversible pump turbine

Zhang

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

139

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“…The maximum out-of-plane displacement is estimated with the velocity normal to the plane obtained from RANS simulations [18].…”

Section: Piv Setupmentioning

confidence: 99%

Investigation of Flow Separation in a Diffuser of a Bulb Turbine

Duquesne

Maciel

Deschênes

2015

Journal of Fluids Engineering

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A three-dimensional unsteady flow separation in the straight diffuser of a model bulb turbine is investigated using tuft visualizations, unsteady wall pressure sensors, and particle image velocimetry (PIV). Experimental results reveal a link between the flow separation zone extension and the sudden drop in turbine performances. The flow separation zone grows as the flow rate increases past the best efficiency operating point (OP). It starts on the bottom wall and expands azimuthally and upstream. It deviates and perturbs the flow far upstream. Despite high unsteadiness, a global separation streamline pattern composed of a saddle point and a convergence line emerges.

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“…The flow separation development depends on the operating sequence, mainly trigged by the guide vane opening or closing [6] [11]. Furthermore, the flow conditions in the operating range of OP3 to OP5 present low frequency, large scale fluctuations.…”

Section: Hill Chartmentioning

confidence: 99%