1. Numerical investigation of the effect of chevrons in subsonic jets using URANS
- Author
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P.S. Tide and V. Babu
- Subjects
Numerical predictions ,Far field ,Experimental data ,Numerical simulation ,Computational fluid dynamics ,Jet noise ,Acoustic noise measurement ,Physics::Fluid Dynamics ,Subsonic jets ,Jets ,Sound pressure ,Numerical investigations ,Physics ,Absolute values ,Far-field noise ,Shear-stress transport ,Mathematical models ,Axial vorticity ,Nozzles ,Ffowcs Williams-Hawkings equation ,Turbulence ,business.industry ,Chevron nozzle ,Overall sound pressure level ,Stagnation pressures ,Subsonic jet noise ,Mechanics ,Vorticity ,Computer simulation ,Condensed Matter Physics ,Computer Science Applications ,Chevrons ,Unsteady reynolds-averaged navier-stokes ,Turbulence kinetic energy ,Turbulent jet ,Turbulent kinetic energy ,Stagnation pressure ,Reynolds-averaged Navier–Stokes equations ,business ,Acoustic noise ,Kinetic energy - Abstract
Numerical simulations of compressible, turbulent jets at M = 0.75 using the Shear Stress Transport (SST) k-? 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. Copyright � 2010 Inderscience Enterprises Ltd.
- Published
- 2010
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