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Numerical verification of rapid-prototyped flexible surrogates of laboratory models of hydroturbines

DOI: 10.1615/THMT-18.900
pages 847-857

A. V. Minakov
Siberian Federal University, Institute of Thermophysics of SB RAS, Baker Hughes Inc, 50/44 Akademgorodok, ICMSB RAS, TORINS, Krasnoyarsk, 660036; Novosibirsk State University, Novosibirsk, Russia

Ivan Litvinov
S. S. Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia

D. Platonov
Siberian Federal University, Svobodniy 79, Krasnoyarsk, Russia; Novosibirsk State University, Novosibirsk, Russia

A. A. Dekterev
Institute of Thermophysics of SB RAS, Krasnoyarsk branch, 50/44 Akademgorodok, ICM SB RAS, TORINS, Krasnoyarsk, 660036; Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, 1 Akad. Lavrentiev Ave., Novosibirsk, 630090

Sergei I. Shtork
S. S. Kutateladze Institute of Thermal Physics, Siberian Branch of the Russian Academy of Sciences, 1 Academician Lavrent'ev Ave., Novosibirsk, 630090, Russia

Kemal Hanjalic
Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Faculty of Applied Sciences, Delft University of Technology (TU Delft), Building 58, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands

Abstract

We report on parallel experimental and numerical studies of flow, internal unsteadiness, vortex instability and associated pressure pulsations in an air model of hydroturbine draft-tube operating at off-design conditions. The air-rig, equipped with automated Laser-Doppler velocimeter and sensitive microphones, accommodates different types of surrogate turbine rotors manufactured by rapid prototyping and 3D printing, making it possible to explore a large number of different turbine and draft-tube configurations. The part-load regimes reveal in draft-tube different patterns of precessing vortex cores in form of multiple or single helical ropes, accompanied by pressure pulsations with distinct peaks at the characteristic frequencies. The complementing LES as well as some of the RANS models reproduced well the flow patterns, vortex structures and the recorded pressure pulsations, supplementing the experiments with information that are inaccessible to measurements.

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