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July 30, 2023
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July 30, 2023
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Abstract

The mean flow field of a turbulent jet issuing into a confined, uniform counterflow is studied. Computations are performed for a range of jet-to-counterflow velocity ratio ranging from 2 to 20 and jet exit-to-confining duct diameter ratio from 5 to 100. The flow field is dominated by a large recirculation region due to the interaction between the jet and the counterflow. The velocity profiles in a limited region of the jet are found to be self-similar. The jet penetration length varies linearly with velocity ratio for large values of diameter ratio. The presence of the external bounding walls cause departure from this linear relationship. A model for velocity decay along the jet centreline available for the unconfined case is shown to be useful for the confined cases also. An interesting double-peak in turbulence intensity along the jet centreline is observed.

Keywords

Turbulent Jet, Counterflow, Penetration Length, Potential Core, Entrainment.

Article Details

How to Cite
Sivapragasam, M., Ramamurthy, S., Deshpande, M. D., & White, P. (2023). Computation of Turbulent Jet in a Confined Counterflow. Journal of Aerospace Sciences and Technologies, 72(3), 144–158. https://doi.org/10.61653/joast.v72i3.2020.181
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