Abstract
In a continuing effort to study the mixing enhancement by large scale streamwise vortices generated by a lobed nozzle, a high-resolution stereoscopic PIV system was used in the present study to conduct three-dimensional measurements of air jet flows exhausted from a lobed nozzle and a conventional circular nozzle. The three-dimensional instantaneous and ensemble averaged velocity fields, instantaneous and mean streamwise vorticity distributions and turbulent kinetic energy distributions of the stereoscopic PIV measurement results were used to analyze the characteristics of the mixing process in the lobed jet mixing flow compared with the conventional circular jet flow. The existence of large-scale streamwise vortices in the lobed jet mixing flow is revealed clearly from the stereoscopic PIV measurement results. The large scale streamwise vortices generated by the corrugated trailing edge of the lobed nozzle were found to break into smaller, but not weaker streamwise vortices, gradually as they travel downstream. This is proposed to be the reason why a lobed nozzle would enhance both large-scale mixing and small scale mixing reported by other researchers. The overall effect of the lobed nozzle on the mixing process in the lobed jet mixing flow was evaluated by analyzing the mean streamwise vorticity distributions. It was found that mean streamwise vortices in the lobed jet mixing flow grew and expanded radically at the first one and half diameters of the test nozzle, then broke down into smaller and weaker vortices farther downstream. The averaged turbulent kinetic energy profile indicated that most of the intensive mixing between the core jet flow and ambient flow due to the special geometry of the lobed nozzle occurred at the first two diameters, which corresponds to the upstream region where the mean streamwise vortices broke down.
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Hu, H., Saga, T., Kobayashi, T., Taniguchi, N. (2002). Stereoscopic PIV measurement of a lobed jet mixing flow. In: Laser Techniques for Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-08263-8_25
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DOI: https://doi.org/10.1007/978-3-662-08263-8_25
Publisher Name: Springer, Berlin, Heidelberg
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