Abstract
The start-up of a turbomachine or, more generally, the large and quick variation of its rotational speed is rarely studied. Knapp1 has shown that in the case of a slow variation, the behavior of a turbomachine is quasi-steady. If the variation is quick, this is not true. This fact was confirmed by authors who have studied experimentally quick start-up of centrifugal hydraulic pumps. Tsukamoto and Ohashi2 have explained the basic mechanism of deviation from quasi-steadiness as a consequence of impulsive pressure and lag in formation of circulation around the blades. They have proposed a non-dimensional parameter of quasi-steadiness. Barrand and al3 have studied in depth the complex interaction between the pump and the components (ie pipelines, tank, valves.,) of the hydraulic circuit. They have also shown the effects of unsteady cavitation. Nguyen and al4 have analysed the behaviour of liquid hydrogen pumps during the start-up of space-rocket engines: they have concluded that the quasi-steady assumption is valid for these machines, a coherent result regarding the Tsukamoto-Ohashi parameter.
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References
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© 1998 Springer Science+Business Media Dordrecht
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Debard, M., Ferrand, P., Leboeuf, F. (1998). Preliminary Results of a Unsteady Throughflow Code to Simulate the Start-Up of a Multistaged Turbopump. In: Fransson, T.H. (eds) Unsteady Aerodynamics and Aeroelasticity of Turbomachines. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5040-8_38
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DOI: https://doi.org/10.1007/978-94-011-5040-8_38
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