Jet noise reduction via fluidic injection

Ryan B. Caeti; Iraj M. Kalkhoran

doi:10.2514/1.J051872

Jet noise reduction via fluidic injection

Ryan B. Caeti, Iraj M. Kalkhoran

Mechanical and Aerospace Engineering

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

Abstract

In this study, a method for reducing the jet noise of a high-speed jet is presented. An array of microjets was immersed within the centerline of an underexpanded Mach 1.6 jet in an effort to reduce the overall sound pressure level and alter its spectral composition. Based on the mass flux through the microjets and the location of the microjets along the centerline of the jet, reductions of up to 5.81 dB with respect to the downstream direction and 7.99 dB with respect to the perpendicular direction can be achieved. An interesting phenomenon is discovered whereby the maximum noise reduction in the downstream direction is found with injection activated, whereas the maximum noise reduction in the perpendicular direction is found with injection deactivated. Placement of the injection tube within the flow is shown to eradicate distinct tones while flow visualizations depicted a strong augmentation in the jet plume via a modification of the shear layer and the internal shock cell structure.

Original language	English (US)
Pages (from-to)	26-32
Number of pages	7
Journal	AIAA journal
Volume	52
Issue number	1
DOIs	https://doi.org/10.2514/1.J051872
State	Published - Jan 2014

ASJC Scopus subject areas

Aerospace Engineering

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10.2514/1.J051872

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@article{a067dc67fab649329d989f3181f0af58,

title = "Jet noise reduction via fluidic injection",

abstract = "In this study, a method for reducing the jet noise of a high-speed jet is presented. An array of microjets was immersed within the centerline of an underexpanded Mach 1.6 jet in an effort to reduce the overall sound pressure level and alter its spectral composition. Based on the mass flux through the microjets and the location of the microjets along the centerline of the jet, reductions of up to 5.81 dB with respect to the downstream direction and 7.99 dB with respect to the perpendicular direction can be achieved. An interesting phenomenon is discovered whereby the maximum noise reduction in the downstream direction is found with injection activated, whereas the maximum noise reduction in the perpendicular direction is found with injection deactivated. Placement of the injection tube within the flow is shown to eradicate distinct tones while flow visualizations depicted a strong augmentation in the jet plume via a modification of the shear layer and the internal shock cell structure.",

author = "Caeti, {Ryan B.} and Kalkhoran, {Iraj M.}",

note = "Funding Information: This work was supported in part by the GK-12 Fellows Program of the National Science Foundation under grant DGE-0741714: Applying Mechatronics to Promote Science. The method and apparatus presented here are proprietary to the Polytechnic Institute of New York (U.S. patent pending).",

year = "2014",

month = jan,

doi = "10.2514/1.J051872",

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AU - Caeti, Ryan B.

AU - Kalkhoran, Iraj M.

N1 - Funding Information: This work was supported in part by the GK-12 Fellows Program of the National Science Foundation under grant DGE-0741714: Applying Mechatronics to Promote Science. The method and apparatus presented here are proprietary to the Polytechnic Institute of New York (U.S. patent pending).

PY - 2014/1

Y1 - 2014/1

N2 - In this study, a method for reducing the jet noise of a high-speed jet is presented. An array of microjets was immersed within the centerline of an underexpanded Mach 1.6 jet in an effort to reduce the overall sound pressure level and alter its spectral composition. Based on the mass flux through the microjets and the location of the microjets along the centerline of the jet, reductions of up to 5.81 dB with respect to the downstream direction and 7.99 dB with respect to the perpendicular direction can be achieved. An interesting phenomenon is discovered whereby the maximum noise reduction in the downstream direction is found with injection activated, whereas the maximum noise reduction in the perpendicular direction is found with injection deactivated. Placement of the injection tube within the flow is shown to eradicate distinct tones while flow visualizations depicted a strong augmentation in the jet plume via a modification of the shear layer and the internal shock cell structure.

AB - In this study, a method for reducing the jet noise of a high-speed jet is presented. An array of microjets was immersed within the centerline of an underexpanded Mach 1.6 jet in an effort to reduce the overall sound pressure level and alter its spectral composition. Based on the mass flux through the microjets and the location of the microjets along the centerline of the jet, reductions of up to 5.81 dB with respect to the downstream direction and 7.99 dB with respect to the perpendicular direction can be achieved. An interesting phenomenon is discovered whereby the maximum noise reduction in the downstream direction is found with injection activated, whereas the maximum noise reduction in the perpendicular direction is found with injection deactivated. Placement of the injection tube within the flow is shown to eradicate distinct tones while flow visualizations depicted a strong augmentation in the jet plume via a modification of the shear layer and the internal shock cell structure.

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Jet noise reduction via fluidic injection

Abstract

ASJC Scopus subject areas

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