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 (\(\bar{U}\) and \(\bar{\varTheta }\)), as well as the energy and scalar dissipation rates (\(\bar{\varepsilon }\) and \(\bar{\chi }\)). It is shown that these statistics:
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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);
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unlike the CJ, they reach self-similarity faster, a behaviour that may be attributed to the presence of coherent structures.
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Bouha, A., Varea, E., Patte-Rouland, B., Danaila, L. (2019). Self-similarity in Slightly Heated Annular Jet with Large Diameter Ratios. In: Gorokhovski, M., Godeferd, F. (eds) Turbulent Cascades II. ERCOFTAC Series, vol 26. Springer, Cham. https://doi.org/10.1007/978-3-030-12547-9_16
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DOI: https://doi.org/10.1007/978-3-030-12547-9_16
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