Effect of large-scale mixing on the axisymmetric structure of turbulence correlations in complex dual stream jets

Afsar, M. Z. and Gryazev, V. and Markesteijn, A. and Karabasov, S. (2020) Effect of large-scale mixing on the axisymmetric structure of turbulence correlations in complex dual stream jets. In: 2020 AIAA Aviation and Aeronautics Forum and Exposition, 2020-06-15 - 2020-06-19, Virtual Event.

[img]
Preview
 Text (Afsar-etal-AIAA-2020-large-scale-mixing-on-the-axisymmetric-structure-of-turbulence-correlations-in-complex-dual-stream-jets)
Afsar_etal_AIAA_2020_large_scale_mixing_on_the_axisymmetric_structure_of_turbulence_correlations_in_complex_dual_stream_jets.pdf
Accepted Author Manuscript
Download (2MB)| Preview

    Abstract

    Dual-stream flows are a ubiquitous feature of turbofan engines used in civil aviation. In this paper we analyze the spatial structure of turbulence correlations in a high speed round coaxial jet operating at heated conditions. In particular we consider the effect of axisymmetry of a second rank correlation tensor and the usual fourth order Reynolds stress auto-covariance tensor that enters the Goldstein’s generalized acoustic analogy formulation. The invariants of these tensors can be reduced to a simpler form depending on whether isotropy or axisymmetry was assumed. We show that an axisymmetric turbulence approximation remains accurate in the core region but tends to break down in the bypass stream and especially in the interfacial region between both streams where high level of mixing of turbulence takes place. In the paper we present some of our latest results and provide a road map for the future calculations that we have planned.

    Creators(s): Afsar, M. Z. ORCID logoORCID: https://orcid.org/0000-0002-7417-2089, Gryazev, V., Markesteijn, A. and Karabasov, S.;
    Item type:Conference or Workshop Item(Paper)
    ID code:72896
    Notes:Paper no: AIAA 2020-2573. Presented in session: Jet Aeroacoustics V.
    Keywords:turbulence, high-order correlation functions, dual-stream flows, mechanics, Motor vehicles. Aeronautics. Astronautics, Aerospace Engineering
    Subjects:Technology > Motor vehicles. Aeronautics. Astronautics
    Department:Strategic Research Themes > Ocean, Air and Space
    Faculty of Engineering > Mechanical and Aerospace Engineering
    Depositing user: Pure Administrator
    Date deposited:24 Jun 2020 13:31
    Last modified:20 Jan 2021 15:09
    URI:https://strathprints.strath.ac.uk/id/eprint/72896
    Export data:
    CORE (COnnecting REpositories)