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Generation of upper trailing counter-rotating vortices of a sonic jet in a supersonic crossflow: Generation of upper trailing CRVs of transverse sonic jet in a supersonic crossflow at Ma=2.7

Generation of upper trailing counter-rotating vortices of a sonic jet in a supersonic crossflow: Generation of upper trailing CRVs of transverse sonic jet in a supersonic crossflow at Ma=2.7
Generation of upper trailing counter-rotating vortices of a sonic jet in a supersonic crossflow: Generation of upper trailing CRVs of transverse sonic jet in a supersonic crossflow at Ma=2.7
Direct numerical simulations were conducted to investigate physical structures of a transverse sonic air jet injected into a supersonic air crossflow at a Mach number of 2.7. Simulations were run for two different jet-to-crossflow momentum flux ratios (J) of 1.85 and 5.5. The main averaged flow features around the transverse jet, such as major counter rotating vortices (CRVs) and trailing CRVs (TCRVs) were captured. The major CRVs form in the lateral portion of the jet plume and absorb other induced trailing vortices downstream of the jet plume. Upper trailing CRVs form above the major CRVs downstream of the jet barrel shock. The streamline analysis indicates that the upper trailing CRVs are related to the Mach disk. As the streamlines penetrate the lateral side of Mach disk where a strong shear condition exists, the baroclinic torque induces upper vorticities in the opposite rotating direction against the major CRVs. Downstream of the Mach disk, the baroclinic vorticity production along the streamlines tends to approach zero, which means no more torque is pumped into the farfield and the upper TCRVs are merged into the major CRVs by their suction.
0001-1452
1047-1059
Sun, Ming-Bo
8bd9b8fe-791b-420d-9f6c-a5cf9a1e1f6a
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Sun, Ming-Bo
8bd9b8fe-791b-420d-9f6c-a5cf9a1e1f6a
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65

Sun, Ming-Bo and Hu, Zhiwei (2018) Generation of upper trailing counter-rotating vortices of a sonic jet in a supersonic crossflow: Generation of upper trailing CRVs of transverse sonic jet in a supersonic crossflow at Ma=2.7. AIAA Journal, 56 (3), 1047-1059. (doi:10.2514/1.J056442).

Record type: Article

Abstract

Direct numerical simulations were conducted to investigate physical structures of a transverse sonic air jet injected into a supersonic air crossflow at a Mach number of 2.7. Simulations were run for two different jet-to-crossflow momentum flux ratios (J) of 1.85 and 5.5. The main averaged flow features around the transverse jet, such as major counter rotating vortices (CRVs) and trailing CRVs (TCRVs) were captured. The major CRVs form in the lateral portion of the jet plume and absorb other induced trailing vortices downstream of the jet plume. Upper trailing CRVs form above the major CRVs downstream of the jet barrel shock. The streamline analysis indicates that the upper trailing CRVs are related to the Mach disk. As the streamlines penetrate the lateral side of Mach disk where a strong shear condition exists, the baroclinic torque induces upper vorticities in the opposite rotating direction against the major CRVs. Downstream of the Mach disk, the baroclinic vorticity production along the streamlines tends to approach zero, which means no more torque is pumped into the farfield and the upper TCRVs are merged into the major CRVs by their suction.

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AIAA submission 20171011 - Accepted Manuscript
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Accepted/In Press date: 9 December 2017
e-pub ahead of print date: 2 February 2018

Identifiers

Local EPrints ID: 419008
URI: http://eprints.soton.ac.uk/id/eprint/419008
ISSN: 0001-1452
PURE UUID: 3abcbf35-ab2e-4c97-9568-140e00201464

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Date deposited: 27 Mar 2018 16:31
Last modified: 25 Nov 2021 21:13

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Author: Ming-Bo Sun
Author: Zhiwei Hu

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