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Response of supercritical round jets to various excitation modes

Published online by Cambridge University Press:  15 March 2021

Mohammad Shahsavari ,
Bing Wang Open the ORCID record for Bing Wang [Opens in a new window] ,
Bo Zhang ,
Guanyu Jiang  and
Dan Zhao
Mohammad Shahsavari
Affiliation:
School of Aerospace Engineering, Tsinghua University, Beijing100084, PR China
Bing Wang*
Affiliation:
School of Aerospace Engineering, Tsinghua University, Beijing100084, PR China
Bo Zhang
Affiliation:
School of Aerospace Engineering, Tsinghua University, Beijing100084, PR China
Guanyu Jiang
Affiliation:
School of Aerospace Engineering, Tsinghua University, Beijing100084, PR China
Dan Zhao
Affiliation:
Department of Mechanical Engineering, University of Canterbury, Christchurch8041, New Zealand
*
†Email address for correspondence: [email protected]
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Abstract

In this study, the response of a supercritical round jet to various excitation modes including varicose, helical, flapping, dual varicose/helical and dual varicose/flapping is studied using large eddy simulations. A translation method is proposed to enhance the accuracy of the equation-of-state and transport correlations. Results show that the excitations, especially the dual modes and the varicose mode (when the forcing frequency matches the preferred mode in the potential core), considerably increase the turbulent mixing, the pitch distance and the penetration depth of the coherent structures as compared with the unexcited case. However, the excitations, especially the dual modes, de-energize the coherent structures and reduce the degree of three-dimensionality of the coherent structures. The excitations reduce the potential core length drastically, especially under the flapping and the dual mode excitations. Analyses show that the dual varicose/flapping mode excitations have the highest impacts on the jet development and the cross-section shape as compared with the other modes. Moreover, the dual varicose/flapping excitations have the highest impact on the large-scale turbulent mixing. However, the small-scale turbulent mixing is at the maximum value, when the supercritical jet is stimulated by the dual varicose/flapping mode excitations with the varicose-to-flapping frequency ratio of 2. The cross-correlations between the density fluctuations and the imposed perturbations indicate that the impact of the excitations on the turbulent diffusion is at the maximum value at the potential core breakdown location, while the correlation diminishes at the other locations.

JFM classification

Mixing: Turbulent mixing Turbulent Flows: Turbulence control Flow Control: Mixing enhancement
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 915 , 25 May 2021 , A47
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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