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Examination of the Effects of Circular Ring on the Developing Region of Axisymmetric Round Jet Flow


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DOI: https://doi.org/10.15866/ireme.v16i11.22582

Abstract


The influence of circular ring on the dynamics of the flow on the developing region of axisymmetric round jet is examined. The jet is produced from a smoothly contracting round nozzle and the flow structure is controlled by varying the air blower speed in order to obtain various Reynolds numbers. Ring made of 0.5 mm diameter and positioned at x/d=0.12 is used to perturb the shear layer of round nozzle of diameter 25.4 mm. Hot wire measurement is carried out at the near and intermediate fields (0.5≤x/d≤30) for both perturbed (disturbed) and unperturbed (undisturbed) jet. Measurements were also made in the confined flow for both cases. The results show increase in potential core and further reduction in centerline velocity at the end of potential core for disturbed jet when compared with undisturbed jet for the Reynolds numbers considered (5210, 7000 and 9117). Spread rate reduces in perturbed jet due to the shear layer compression in the developing region. However, velocity profile seems not to be affected by the perturbation in the near field but a compression of the profile is noticed further away from near field. Also, the flow measured in the pipe attached to the nozzle for both cases show almost constant value of normalized centerline velocity and has reduced values when compared with undisturbed jet. The foregoing clearly indicates mass redistribution in the confined region. Overall, while the wavelength of the oscillation is unchanged, the magnitude is altered suggesting a change in the dynamics of the layer.
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Keywords


Round Jet; Perturbation; Potential Core; Centerline Velocity; Jet Half-Width; Reynolds Number; Velocity Profile; Developing Region; Spread Rate; Shear Layer

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References


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