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

M. Z. Afsar, V. Gryazev, A. Markesteijn, S. Karabasov

Research output: Contribution to conferencePaper

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.
Original languageEnglish
PagesAIAA 2020-2573
Number of pages14
DOIs
Publication statusPublished - 15 Jun 2020
Event2020 AIAA Aviation and Aeronautics Forum and Exposition: 2020 AIAA AVIATION Forum - Virtual Event
Duration: 15 Jun 202019 Jun 2020
https://www.aiaa.org/aviation

Conference

Conference2020 AIAA Aviation and Aeronautics Forum and Exposition
Abbreviated titleAIAA 2020
Period15/06/2019/06/20
Internet address

Keywords

  • turbulence
  • high-order correlation functions
  • dual-stream flows
  • mechanics

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    Afsar, M. Z., Gryazev, V., Markesteijn, A., & Karabasov, S. (2020). Effect of large-scale mixing on the axisymmetric structure of turbulence correlations in complex dual stream jets. AIAA 2020-2573. Paper presented at 2020 AIAA Aviation and Aeronautics Forum and Exposition, . https://doi.org/10.2514/6.2020-2573