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Experimental Study on Swirling Jets


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DOI: https://doi.org/10.15866/ireme.v12i6.14936

Abstract


Experimental results on swirling flows are presented, contributing to the investigation and understanding of vortical flows close to vortex breakdown conditions. A swirling jet, issuing from a straight tube in a coaxial tube of larger diameter, is studied. Swirl is introduced by a rotating vane, located close to the jet outlet. Initial conditions, flow rates and swirl strengths can be parametrically controlled. In the present experiments two inner tube flow rates are combined with two inner jet swirls. The mean and turbulent flow fields are monitored on the axial central plane, based on measurements of all three velocity components, with stereoscopic 3D-PIV. Refractive index matching is utilized to eliminate optical distortions. A recirculation bubble stabilized downstream the exit of the swirl nozzle is the predominant coherent structure, formed due to the expansion of the swirling jet. The Reynolds number along with the swirl number are the nondimensional parameters used to interpret the measurements and to discuss the attributes of the flow field. The recirculation bubble topology is closely related to the rotation of the swirling jet, whereas the effect of the flowrate ιs of minor importance.
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Keywords


Swirling Flow; Vortex Breakdown; Coaxial Flow; Particle Image Velocimetry

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References


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