Influence of vortex core on wake vortex sound emission
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Influence of vortex core on wake vortex sound emission

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  • English

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    • NTL Classification:
      NTL-AVIATION-AVIATION;NTL-AVIATION-Aviation Energy and Environment;NTL-ENERGY AND ENVIRONMENT-Aviation Energy and Environment;NTL-ENERGY AND ENVIRONMENT-Environment Impacts;
    • Abstract:
      A consistent and presistent mechanism of sound emission from aircraft wake vortices has been identified. Both measurement data and theoretical results show that a dominant frequency of sound pressure matches the rotation frquency of a Kirchhoff vortex due to the self-induction inside the vortex core. Numerical simulations for more realistic wake vortex pairs with inviscid ground effects and shear flow are carried out using a vortex particle method. A far-field vortex sound formulation, based on asymptotic expansions, is developed and compared with formulae in the literature. The simulation results reveal that the frequency of the wake sound emission woul dremain essentially the same as the classical Kirchhoff vortex, even under the influences of an inviscid ground effect or weak-shear cross wind. The aforementioned results suggest that the mechanism identified should be fairly robust.
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