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Sergey Alekseenko
Kutateladze Institute of Thermophysics SB RAS, Lavrentyev Ave. 1, 630090, Novosibirsk, Russia; Department of Physics, Novosibirsk State University

Arthur V. Bilsky
Institute of Thermophysics, Siberian Branch of RAS, Lavrentyev Ave. 1, Novosibirsk, 630090, Russia

Vladimir M. Dulin
Kutateladze Institute of Thermophysics, 1, Lavrentyev Avenue, Novosibirsk, 630090, Russia; Department of Science and Research, Novosibirsk State University 2, Pirogova Street, 630090, Russia

Dmitriy M. Markovich
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences (IT SB RAS), 1, Lavrentyev Ave., Novosibirsk, 630090, Russia; Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Institute of Power Engineering, Tomsk Polytechnic University (TPU), 30, Lenin Ave., Tomsk, 634050, Russia


The local structure of swirling free and impinging turbulent jets is investigated experimentally under the following conditions: jet Reynolds number was equal to 8,900, the nozzle-to-plate distance was equal to three nozzle diameters and the swirl rate was varied from 0 to 1.0. Influence of the impinging plate on the flow structure is examined. It was demonstrated that separation bubble properties are rather sensitive to the presence of impinging wall. The effect of external periodical oscillations imposed on the inlet velocity was studied with various forcing amplitudes. The flow response to the forcing at two Strouhal numbers, St = 0.5 and 1.2, was examined. It was revealed, that for the swirling jet at S = 1.0, which so far was considered to be insensitive to the external forcing, the forcing at St = 1.2 with relatively high amplitude (u'o > 5% of the mean flow rate velocity) results an abrupt change in turbulent structure of the jet and leads to intensification of azimuthal large-scale fluctuations.