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Turbulent structures in a temporally evolving swirling jet

A. M. Souza
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila, 2121, Uberlandia, Minas Gerais, Brazil

F. J. Souza
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila 2121, Campus Santa Monica, 38408100 Uberlandia, Minas Gerais, Brasil

Aristeu da Silveira Neto
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila, 2121, Uberlandia, Minas Gerais, Brazil

C. A. R. Duarte
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila, 2121, Uberlandia, Minas Gerais, Brazil

要約

Swirling jets have numerous applications in industry. A better understanding of the generation and evolution of turbulent structures in jet flows is useful for engineering and theoretical reasons. This work is concerned with the physical analysis of a swirling jet by means of three-dimensional simulations using a pseudo-spectral method. The detailed structures of the flow could be visualized and the mechanisms leading to their formation and evolution are elucidated. A comparison between a swirling and so-called "natural" jet were carried out. The possibility of controlling the jet evolution by prescribing different perturbations to the initial conditions was assessed. The proximity of the inertial region to the inclination of -5/3 and the decay region were verified in the energy spectra.

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