Frequency Response of Fluid Lines With Nonlinear Boundary Conditions

Strunk, Richard D.

doi:10.1115/1.3425257

Cited by 3 publications

(1 citation statement)

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“…The theoretical models are typically divided into models that use a step or a ramp in the measured pressure (Wildhack, 1937;Hougen et al, 1963; and models that assume sinusoidally varying pressures (Hemke. 1927;Nichols, 1962;Karam and Franke, 1967;Tijdeman, 1969;Strunk, 1971;Holmes and Lewis, 1987;Benade and Ibisi, 1987). The first models used laminar Poiseuille flow for ramped input pressures to describe the transfer function of the system (Wildhack, 1937).…”

Section: Discussion Of Available Techniquesmentioning

confidence: 99%

MEMS-based probes for velocity and pressure measurements in unsteady and turbulent flowfields

Rediniotis

1999

37th Aerospace Sciences Meeting and Exhibit

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Section: Discussion Of Available Techniquesmentioning

confidence: 99%

MEMS-based probes for velocity and pressure measurements in unsteady and turbulent flowfields

Rediniotis

1999

37th Aerospace Sciences Meeting and Exhibit

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Prediction of Diffuser Core Flow Fluctuations Caused by Oscillating Turbulent Flow

Schachenmann

Rockwell

1978

Journal of Aircraft

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Theoretical consideration of the time-dependent diffuser core flow, involving two limiting models (highfrequency and low-frequency) for the time-dependent effective core flow area, results in predictions for decay of the first harmonic core velocity and wall pressure amplitudes with streamwise distance. In order to predict these decays, it is necessary to specify only time mean core flow and either time-dependent diffuser inlet or exit conditions. The theoretical models are compared with experiments for diffuser inlet conditions, spanning a tenfold range of dimensionless frequencies. The high-frequency model best predicts the decay of core velocity fluctuations and wall pressure fluctuations in the streamwise direction. A backward calculation scheme, which uses diffuser exit conditions as initial conditions, enables good prediction of the fluctuating wall pressure distributions when the diffuser exit exhausts into the atmosphere. An order-of-magnitude analysis yields a simple expression for decay of the core velocity fluctuations when the dimensionless frequency is approximately unity.

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