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2020•Progress in Computational Fluid Dynamics An International JournalRequires access

Effect of design parameters on flow characteristics of an aerodynamic swirl nozzle

Zahir Uddin Ahmed, Md. Tanvir Khan, Sharif M. Islam

Open publisher page 2 citations

Abstract

This study numerically investigates the flow characteristics for the effect of various nozzle design variables, such as tangential inlet number, length of the nozzle and nozzle shape of an incompressible turbulent swirl air jet. Axial-plus-tangential flow based swirling nozzle is solved using finite volume method, where turbulence is approximated by Shear Stress Transport (SST) k-ω model. The results show that swirl into the flow results in a creation of a forced vortex. The axial velocity and its peak increase with the number of ports, and the tangential velocity is the maximum after the tangential flow is imparted. The static pressure and turbulent kinetic energy are significantly influenced by the number of tangential inlets. The most uniform turbulence is predicted for the tapered cone shape, while the strongest turbulence is observed for the curved shape with the expense of losing some uniformity near the nozzle wall.

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What this paper is about

This study numerically investigates the flow characteristics for the effect of various nozzle design variables, such as tangential inlet number, length of the nozzle and nozzle shape of an incompressible turbulent swirl air jet. Axial-plus-tangential flow based swirling nozzle is solved using finite volume method, where turbulence is approximated by Shear Stress Transport (SST) k-ω model. The results show that swirl into the flow results in a creation of a forced vortex. The axial velocity and its peak increase with the number of ports, and the tangential velocity is the maximum after the tangential flow is imparted. The static pressure and turbulent kinetic energy are significantly influenced by the number of tangential inlets. The most uniform turbulence is predicted for the tapered cone shape, while the strongest turbulence is observed for the curved shape with the expense of losing some uniformity near the nozzle wall.

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Available abstract

This study numerically investigates the flow characteristics for the effect of various nozzle design variables, such as tangential inlet number, length of the nozzle and nozzle shape of an incompressible turbulent swirl air jet. Axial-plus-tangential flow based swirling nozzle is solved using finite volume method, where turbulence is approximated by Shear Stress Transport (SST) k-ω model. The results show that swirl into the flow results in a creation of a forced vortex. The axial velocity and its peak increase with the number of ports, and the tangential velocity is the maximum after the tangential flow is imparted. The static pressure and turbulent kinetic energy are significantly influenced by the number of tangential inlets. The most uniform turbulence is predicted for the tapered cone shape, while the strongest turbulence is observed for the curved shape with the expense of losing some uniformity near the nozzle wall.

Key concepts: Nozzle, Turbulence, Mechanics, Turbulence kinetic energy, Aerodynamics, Inlet, Materials science, Flow (mathematics)

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