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Self-similarity in Slightly Heated Annular Jet with Large Diameter Ratios

Abstract : The study aims at furthering our understanding and quantifying the influence of coherent structures on small-scale turbulence and passive scalar mixing, in an annular jet configuration with large diameter ratios. This ’bluff-body’ geometry is close to that widely used in combustion for flame stabilization [1]. A passive contaminant is introduced in the flow, through a slight heating. We report the evolution along the jet axis of the following quantities: mean values of the longitudinal velocity and passive scalar ( U¯ and Θ¯ ), as well as the energy and scalar dissipation rates ( ε¯ and χ¯ ). It is shown that these statistics: decay as x−1 and x−4 , where x is the streamwise direction, similarly to the decay in the far-field of classical jets (CJ);unlike the CJ, they reach self-similarity faster, a behaviour that may be attributed to the presence of coherent structures.
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Submitted on : Thursday, December 19, 2019 - 10:35:08 AM
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A. Bouha, Emilien Varea, Béatrice Patte-Rouland, Luminita Danaila. Self-similarity in Slightly Heated Annular Jet with Large Diameter Ratios. Turbulent Cascades II Proceedings of the Euromech-ERCOFTAC Colloquium 589, Springer, 2019, ⟨10.1007/978-3-030-12547-9_16⟩. ⟨hal-02418815⟩



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