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A comparative study of sound generation by laminar, combusting and non-combusting jet flows

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Abstract

Sound production by two-dimensional, laminar jet flows with and without combustion is studied numerically and theoretically. The compressible Navier–Stokes, energy and progress variable equations are solved by resolving both the near field and the acoustics. The combusting jet flows are compared to non-combusting jets of the same jet Mach number, with the non-combusting, non-isothermal jets having the same steady temperature difference as the combusting jets. This infers that the magnitude of entropic and density disturbances is similar in some of the combusting and non-combusting cases. The flows are perturbed by a sinusoidal inlet velocity fluctuation at different Strouhal numbers. The computational domain is resolved to the far field in all cases, allowing direct examination of the sound radiated and its sources. Lighthill’s acoustic analogy is then solved numerically using Green’s functions. The radiated sound calculated using Lighthill’s equation is in good agreement with that from the simulations for all cases, validating the numerical solution of Lighthill’s equation. The contribution of the source terms in Dowling’s reformulation of Lighthill’s equation is then investigated. It is shown that the source term relating to changes in the momentum of density inhomogeneities is the dominant source term for all non-reacting, non-isothermal cases. Further, this source term has similar magnitude in the combusting cases and is one of the several source terms that have similar magnitude to the source term involving fluctuations in the heat release rate.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Melbourne, Parkville, VIC, 3010, Australia

    Mohsen Talei & Michael J. Brear

  2. School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW, 2052, Australia

    Evatt R. Hawkes

  3. School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, 2052, Australia

    Evatt R. Hawkes

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  1. Mohsen Talei
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  2. Michael J. Brear
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  3. Evatt R. Hawkes
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Correspondence to Mohsen Talei.

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Communicated by Tim Colonius.

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Talei, M., Brear, M.J. & Hawkes, E.R. A comparative study of sound generation by laminar, combusting and non-combusting jet flows. Theor. Comput. Fluid Dyn. 28, 385–408 (2014). https://doi.org/10.1007/s00162-014-0324-7

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