Feedback amplification of a plane shear layer by impingement on a downstream body

P. Merati; R. J. Adrian

doi:10.1016/0889-9746(92)90024-W

Feedback amplification of a plane shear layer by impingement on a downstream body

P. Merati, R. J. Adrian

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

Abstract

The interaction of a plane shear layer with a thin flat plate located on the centerline of a shear layer has been investigated experimentally. The shear layer velocity ratio is 0·375, and its Reynolds number is ΔU θ₀ v = 625. It is found that disturbances from the vicinity of the disturbing plate leading edge feed back into the initial disturbance field of the shear layer to alter significantly its amplitude, increasing it at certain frequencies and suppressing it at other frequencies by negative feedback. An analytical model is developed for the linear stability region of the shear layer in which the system is treated as a closed-loop, frequency-dependent amplifier with wavelength selection according to a phase condition.

Original language	English (US)
Pages (from-to)	415-436
Number of pages	22
Journal	Journal of Fluids and Structures
Volume	6
Issue number	4
DOIs	https://doi.org/10.1016/0889-9746(92)90024-W
State	Published - Jul 1992
Externally published	Yes

ASJC Scopus subject areas

Mechanical Engineering

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10.1016/0889-9746(92)90024-W

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title = "Feedback amplification of a plane shear layer by impingement on a downstream body",

abstract = "The interaction of a plane shear layer with a thin flat plate located on the centerline of a shear layer has been investigated experimentally. The shear layer velocity ratio is 0·375, and its Reynolds number is ΔU θ0 v = 625. It is found that disturbances from the vicinity of the disturbing plate leading edge feed back into the initial disturbance field of the shear layer to alter significantly its amplitude, increasing it at certain frequencies and suppressing it at other frequencies by negative feedback. An analytical model is developed for the linear stability region of the shear layer in which the system is treated as a closed-loop, frequency-dependent amplifier with wavelength selection according to a phase condition.",

author = "P. Merati and Adrian, {R. J.}",

note = "Funding Information: National Science Foundation Grant.",

year = "1992",

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doi = "10.1016/0889-9746(92)90024-W",

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AU - Merati, P.

AU - Adrian, R. J.

N1 - Funding Information: National Science Foundation Grant.

PY - 1992/7

Y1 - 1992/7

N2 - The interaction of a plane shear layer with a thin flat plate located on the centerline of a shear layer has been investigated experimentally. The shear layer velocity ratio is 0·375, and its Reynolds number is ΔU θ0 v = 625. It is found that disturbances from the vicinity of the disturbing plate leading edge feed back into the initial disturbance field of the shear layer to alter significantly its amplitude, increasing it at certain frequencies and suppressing it at other frequencies by negative feedback. An analytical model is developed for the linear stability region of the shear layer in which the system is treated as a closed-loop, frequency-dependent amplifier with wavelength selection according to a phase condition.

AB - The interaction of a plane shear layer with a thin flat plate located on the centerline of a shear layer has been investigated experimentally. The shear layer velocity ratio is 0·375, and its Reynolds number is ΔU θ0 v = 625. It is found that disturbances from the vicinity of the disturbing plate leading edge feed back into the initial disturbance field of the shear layer to alter significantly its amplitude, increasing it at certain frequencies and suppressing it at other frequencies by negative feedback. An analytical model is developed for the linear stability region of the shear layer in which the system is treated as a closed-loop, frequency-dependent amplifier with wavelength selection according to a phase condition.

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JO - Journal of Fluids and Structures

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ER -

Feedback amplification of a plane shear layer by impingement on a downstream body

Abstract

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