Title: Computational analysis of subsonic jets from round and bevelled nozzles

Authors: M. Sandhya; P.S. Tide

Addresses: Department of Mechanical Engineering, Government Engineering College, Trichur – 680 009, Kerala, India ' Department of Mechanical Engineering, School of Engineering, Cochin University of Science and Technology, Cochin – 682 022, Kerala, India

Abstract: Numerical simulations of turbulent compressible subsonic jets at Mach number 0.75 emanating from round and bevelled nozzles were carried out using a commercially available CFD code. The modelling and calculations were performed on a three-dimensional computational domain using RANS equations and SST k-ω turbulence model. The computational domain was discretised using hexahedral/tetrahedral mesh with approximately two million cells. The flow was investigated for axial and radial profiles of velocity components, shear layer thickness, self preserving nature, turbulent intensity, turbulent viscosity and Reynolds's stresses. The results were found to be in reasonable agreement with the available data in the literature. It was observed that the bevelling of nozzle can significantly change both flow pattern and turbulence structure and thus act as a passive method for jet noise reduction. Moreover, flow characteristics of jets issuing from various nozzle configurations intended to reduce noise levels may be easily evaluated using this computationally less expensive method.

Keywords: subsonic jets; numerical simulation; bevelled nozzles; turbulence modelling; shear layer thickness; round nozzles; CFD; computational fluid dynamics; flow patterns; axial profile; radial profile; shear layer thickness; self preservation; turbulent intensity; turbulent viscosity; Reynolds's stresses; jet noise reduction.

DOI: 10.1504/IJETP.2017.080620

International Journal of Energy Technology and Policy, 2017 Vol.13 No.1/2, pp.141 - 157

Received: 18 Mar 2015
Accepted: 21 Sep 2015
Published online: 01 Dec 2016 *

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