Title: Numerical investigation of the effect of chevrons in subsonic jets using URANS

Authors: P.S. Tide, V. Babu

Addresses: Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India. ' Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India

Abstract: Numerical simulations of compressible, turbulent jets at M = 0.75 using the Shear Stress Transport (SST) k-ω model have been carried out for baseline nozzle and chevron nozzles with 4, 6 and 8 lobes and three different penetration angles (0°, 5° and 10°). The predicted far field noise level at several observer locations are compared with experimental data. Overall sound pressure levels at far field observer locations have been calculated using Ffowcs Williams-Hawkings equation. Numerical prediction of aerodynamic quantities like centreline velocity, stagnation pressure, turbulent kinetic energy and axial vorticity are compared among the nozzles. The Unsteady Reynolds Averaged Navier Stokes (URANS) calculations are able to predict the trends in overall SPL, even though the absolute values are slightly under-predicted.

Keywords: numerical simulation; subsonic jets; jet noise; chevrons; turbulent jets; compressible jets; shear stress transport; sound pressure levels; aerodynamics; centreline velocity; stagnation pressure; turbulent kinetic energy; axial vorticity; computational fluid dynamics; CFD; unsteady Reynolds averaged Navier Stokes; URANS.

DOI: 10.1504/PCFD.2010.031559

Progress in Computational Fluid Dynamics, An International Journal, 2010 Vol.10 No.2, pp.65 - 79

Published online: 10 Feb 2010 *

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