RANS analysis of merging supersonic streamwise vortices for enhanced mixing in scramjet combustors

Donal McCaughey; Marco Geron; Rob Watson

doi:10.2514/6.2022-1410

RANS analysis of merging supersonic streamwise vortices for enhanced mixing in scramjet combustors

Donal McCaughey^*, Marco Geron, Rob Watson

^*Corresponding author for this work

School of Mechanical and Aerospace Engineering

Research output: Contribution to conference › Paper › peer-review

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Abstract

Streamwise vortices are studied as a mixing enhancer for scramjet combustors due to their insensitivity to compressibility relative to spanwise structures. A specific merging interaction between supersonic corotating vortices has been shown in experiments to sustain turbulence production against decay. In this paper this interaction is investigated numerically to determine how well it can be replicated with a RANS approach, and the effect of increasing the Mach
number. The shape and rotation of the merging vortices appears similar to experimental results.
The decay of vorticity follows a similar trend to experimental results, however the vorticity was higher in the RANS results. At higher Mach numbers the merging process appears to be pushed further down the domain.

Original language	English
DOIs	https://doi.org/10.2514/6.2022-1410
Publication status	Published - 03 Jan 2022
Event	AIAA SCITECH 2022 - San Diego, CA & Online, San Diego, United States Duration: 03 Jan 2022 → 07 Jan 2022 https://www.aiaa.org/scitech

Conference

Conference	AIAA SCITECH 2022
Country/Territory	United States
City	San Diego
Period	03/01/2022 → 07/01/2022
Internet address	https://www.aiaa.org/scitech

Keywords

CFD (Computational fluid dynamics)
Mixing
Scramjet

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6.2022-1410
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Cite this

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title = "RANS analysis of merging supersonic streamwise vortices for enhanced mixing in scramjet combustors",

abstract = "Streamwise vortices are studied as a mixing enhancer for scramjet combustors due to their insensitivity to compressibility relative to spanwise structures. A specific merging interaction between supersonic corotating vortices has been shown in experiments to sustain turbulence production against decay. In this paper this interaction is investigated numerically to determine how well it can be replicated with a RANS approach, and the effect of increasing the Machnumber. The shape and rotation of the merging vortices appears similar to experimental results.The decay of vorticity follows a similar trend to experimental results, however the vorticity was higher in the RANS results. At higher Mach numbers the merging process appears to be pushed further down the domain.",

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AU - McCaughey, Donal

AU - Geron, Marco

AU - Watson, Rob

PY - 2022/1/3

Y1 - 2022/1/3

N2 - Streamwise vortices are studied as a mixing enhancer for scramjet combustors due to their insensitivity to compressibility relative to spanwise structures. A specific merging interaction between supersonic corotating vortices has been shown in experiments to sustain turbulence production against decay. In this paper this interaction is investigated numerically to determine how well it can be replicated with a RANS approach, and the effect of increasing the Machnumber. The shape and rotation of the merging vortices appears similar to experimental results.The decay of vorticity follows a similar trend to experimental results, however the vorticity was higher in the RANS results. At higher Mach numbers the merging process appears to be pushed further down the domain.

AB - Streamwise vortices are studied as a mixing enhancer for scramjet combustors due to their insensitivity to compressibility relative to spanwise structures. A specific merging interaction between supersonic corotating vortices has been shown in experiments to sustain turbulence production against decay. In this paper this interaction is investigated numerically to determine how well it can be replicated with a RANS approach, and the effect of increasing the Machnumber. The shape and rotation of the merging vortices appears similar to experimental results.The decay of vorticity follows a similar trend to experimental results, however the vorticity was higher in the RANS results. At higher Mach numbers the merging process appears to be pushed further down the domain.

KW - CFD (Computational fluid dynamics)

KW - Mixing

KW - Scramjet

U2 - 10.2514/6.2022-1410

DO - 10.2514/6.2022-1410

M3 - Paper

T2 - AIAA SCITECH 2022

Y2 - 3 January 2022 through 7 January 2022

ER -

RANS analysis of merging supersonic streamwise vortices for enhanced mixing in scramjet combustors

Abstract

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Keywords

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