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Velocity and Passive Scalar Characteristics in a Round Jet with Grids at the Nozzle Exit

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Abstract

Velocity and passive scalar (temperature) measurements have been made in the near field of a round jet with and without obstructing grids placed at the jet exit. The Reynolds number Re D (based on the exit centreline velocity and nozzle diameter) is 4.9 × 104 and the flow is incompressible, while the temperature rise does not affect the velocity behaviour. The streamwise development and radial spreading of the passive scalar are attenuated, relative to the unobstructed jet. Close to the jet outlet, the spatial similarity of the moments (up to the third-order) of velocity fluctuations is improved, when the jet is perturbed. An explanation, based on the reduced effect of the large coherent structures in the developing region, is provided.

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  1. Discipline of Mechanical Engineering, University of Newcastle, NSW 2308, Australia

    P. Burattini & L. Djenidi

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  1. P. Burattini
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Correspondence to P. Burattini.

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Burattini, P., Djenidi, L. Velocity and Passive Scalar Characteristics in a Round Jet with Grids at the Nozzle Exit. Flow, Turbulence and Combustion 72, 199–218 (2004). https://doi.org/10.1023/B:APPL.0000044412.79451.64

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