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Investigation of three-scalar subgrid-scale mixing in turbulent coaxial jets

Published online by Cambridge University Press:  16 August 2021

Wei Li ,
Mengyuan Yuan Open the ORCID record for Mengyuan Yuan [Opens in a new window] ,
Campbell D. Carter  and
Chenning Tong Open the ORCID record for Chenning Tong [Opens in a new window]
Wei Li
Affiliation:
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634, USA
Mengyuan Yuan
Affiliation:
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634, USA
Campbell D. Carter
Affiliation:
Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH 45433, USA
Chenning Tong*
Affiliation:
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634, USA
*
†Email address for correspondence: ctong@clemson.edu
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Abstract

Three-scalar subgrid-scale (SGS) mixing in turbulent coaxial jets is investigated experimentally. The flow consists of a centre jet, an annulus and a co-flow. The SGS mixing process and its dependence on the velocity and length scale ratios of the annulus flow to the centre jet are investigated. For small SGS scalar variance the scalars are well mixed and the initial three-scalar mixing configuration is lost. For large SGS variance, the scalars are highly segregated with a bimodal scalar filtered joint density function (f.j.d.f.) at a range of radial locations. Two competing factors, the SGS variance and the scalar length scale, play an important role for the bimodal f.j.d.f. For the higher velocity ratio cases, the peak value of the SGS variance is higher, thereby resulting in stronger bimodality. For the lower velocity ratio cases, the wider mean SGS variance profiles and the smaller scalar length scale cause bimodal f.j.d.f.s over a wider range of physical locations. The scalar dissipation rate structures have similarities to those of mixture fraction and temperature in turbulent non-premixed/partially premixed flames. The observed SGS mixing characteristics present a challenging test for SGS mixing models as well as provides an understanding of the physics for developing improved models. The results also provide a basis for investigating multiscalar SGS mixing in turbulent reactive flows.

JFM classification

Mixing: Turbulent mixing Reacting Flows: Turbulent reacting flows Turbulent Flows: Turbulence modelling
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 924 , 10 October 2021 , A40
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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