Mechanism of controlling supersonic cavity oscillations using upstream mass injection

Weipeng Li; Taku Nonomura; Kozo Fujii

doi:10.1063/1.4816650

Mechanism of controlling supersonic cavity oscillations using upstream mass injection

Weipeng Li, Taku Nonomura, Kozo Fujii

ENG - Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

The mechanism of controlling supersonic cavity oscillations using upstream mass injection is investigated by implicit large-eddy simulations of a turbulent flow (M∞ = 2.0, ReD = 105) past a rectangular cavity with a length-to-depth ratio of 2. The mass injection is simulated by specifying a vertical velocity profile of a jet ejecting steadily through a slot placed at the upstream of the cavity leading edge. The results show that the steady upstream mass injection produces significant attenuation of the cavity oscillations, and two primary mechanisms are demonstrated to be directly responsible for the noise suppression: lifting up of the cavity shear layer, and damping of the shear-layer instability. It is found that the case of low mass flow injection investigated is more effective in stabilizing the cavity shear layer than the high mass flow injection. A transition stage might exist between two well-developed oscillating modes, but "mode-switching" is not observed.

Original language	English
Article number	086101
Journal	Physics of Fluids
Volume	25
Issue number	8
DOIs	https://doi.org/10.1063/1.4816650
Publication status	Published - 2013 Aug 26

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title = "Mechanism of controlling supersonic cavity oscillations using upstream mass injection",

abstract = "The mechanism of controlling supersonic cavity oscillations using upstream mass injection is investigated by implicit large-eddy simulations of a turbulent flow (M∞ = 2.0, ReD = 105) past a rectangular cavity with a length-to-depth ratio of 2. The mass injection is simulated by specifying a vertical velocity profile of a jet ejecting steadily through a slot placed at the upstream of the cavity leading edge. The results show that the steady upstream mass injection produces significant attenuation of the cavity oscillations, and two primary mechanisms are demonstrated to be directly responsible for the noise suppression: lifting up of the cavity shear layer, and damping of the shear-layer instability. It is found that the case of low mass flow injection investigated is more effective in stabilizing the cavity shear layer than the high mass flow injection. A transition stage might exist between two well-developed oscillating modes, but {"}mode-switching{"} is not observed.",

author = "Weipeng Li and Taku Nonomura and Kozo Fujii",

note = "Funding Information: This work was mainly done when the first author was a Ph.D. candidate at the Dept. of Aeronautics and Astronautics, University of Tokyo, Japan under the supervision of the second and third authors. The first author would like to extend his gratitude to the MEM International Graduate Program of the University of Tokyo for having given the financial supports. This research is partially supported by Strategic Programs for Innovative Research (SPIRE) of High Performance Computing Initiative (HPCI).",

year = "2013",

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doi = "10.1063/1.4816650",

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AU - Li, Weipeng

AU - Nonomura, Taku

AU - Fujii, Kozo

N1 - Funding Information: This work was mainly done when the first author was a Ph.D. candidate at the Dept. of Aeronautics and Astronautics, University of Tokyo, Japan under the supervision of the second and third authors. The first author would like to extend his gratitude to the MEM International Graduate Program of the University of Tokyo for having given the financial supports. This research is partially supported by Strategic Programs for Innovative Research (SPIRE) of High Performance Computing Initiative (HPCI).

PY - 2013/8/26

Y1 - 2013/8/26

N2 - The mechanism of controlling supersonic cavity oscillations using upstream mass injection is investigated by implicit large-eddy simulations of a turbulent flow (M∞ = 2.0, ReD = 105) past a rectangular cavity with a length-to-depth ratio of 2. The mass injection is simulated by specifying a vertical velocity profile of a jet ejecting steadily through a slot placed at the upstream of the cavity leading edge. The results show that the steady upstream mass injection produces significant attenuation of the cavity oscillations, and two primary mechanisms are demonstrated to be directly responsible for the noise suppression: lifting up of the cavity shear layer, and damping of the shear-layer instability. It is found that the case of low mass flow injection investigated is more effective in stabilizing the cavity shear layer than the high mass flow injection. A transition stage might exist between two well-developed oscillating modes, but "mode-switching" is not observed.

AB - The mechanism of controlling supersonic cavity oscillations using upstream mass injection is investigated by implicit large-eddy simulations of a turbulent flow (M∞ = 2.0, ReD = 105) past a rectangular cavity with a length-to-depth ratio of 2. The mass injection is simulated by specifying a vertical velocity profile of a jet ejecting steadily through a slot placed at the upstream of the cavity leading edge. The results show that the steady upstream mass injection produces significant attenuation of the cavity oscillations, and two primary mechanisms are demonstrated to be directly responsible for the noise suppression: lifting up of the cavity shear layer, and damping of the shear-layer instability. It is found that the case of low mass flow injection investigated is more effective in stabilizing the cavity shear layer than the high mass flow injection. A transition stage might exist between two well-developed oscillating modes, but "mode-switching" is not observed.

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Mechanism of controlling supersonic cavity oscillations using upstream mass injection

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