The scaling of the wall pressure fluctuations in polymer-modified turbulent boundary layer flow

2000 ◽  
Vol 108 (1) ◽  
pp. 71-75 ◽  
Author(s):  
Timothy A. Brungart ◽  
Wayne J. Holmberg ◽  
Arnold A. Fontaine ◽  
Steven Deutsch ◽  
Howard L. Petrie
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Boundary Layer Flow ◽  
Pressure Fluctuations ◽  
Wall Pressure ◽  
Wall Pressure Fluctuations ◽  
Turbulent Boundary Layer Flow ◽  
Layer Flow

Wall pressure fluctuations in attached boundary-layer flow

AIAA Journal ◽  
1983 ◽  
Vol 21 (4) ◽  
pp. 495-502 ◽  
Author(s):  
A. L. Laganelli ◽  
A. Martellucci ◽  
L. L. Shaw
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Flow ◽  
Pressure Fluctuations ◽  
Wall Pressure ◽  
Wall Pressure Fluctuations ◽  
Layer Flow

Acoustic Radiation From Separated Boundary-Layer Flow Over a Rearward-Facing Step on a Flat Panel

2003 ◽  
Author(s):  
Walter A. Kargus ◽  
Gerald C. Lauchle
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Acoustic Radiation ◽  
Fluid Dynamic ◽  
Pressure Fluctuations ◽  
Wall Pressure ◽  
Wall Jet ◽  
Measured Velocity ◽  
Wall Pressure Fluctuations ◽  
Layer Flow

The acoustic radiation from a turbulent boundary layer that occurs downstream of a rearward facing step discontinuity and reattaches to a flat plat is considred experimentally. The step is exposed ot a zero incidence, uniform subsonic flow. a quiet wall jet facility situated in an anechoic chamber is used for the studies. The “point” wall pressure spectra are measured by small, “pinhole” microphones located at various locations under the layer, including a point directly in the 90° corner of the step. The wall pressure fluctuations measured at the various locations are correlated with the signal detected by a far-field microphone. The measured cross-spectral densities are thus used to identify the relative contributions of the various flow regimes to the direct radiation. It is shown that the separation of the flow over the corner of the step is a dominant acoustic source, which is supported not only by the measured cross spectra, but also by the favorable comparison of the measured velocity power law to the theoretical value. Measurements made where the flow reattaches and at the turbulent boundary layer are less conclusive. This is because the pinhole tube attached to the microphone produced a sound due to a fluid-dynamic oscillation, which contaminated the measurement of the aeroacoustic sources.

On the Flow-Induced Structural Noise of a Ship’s Sonar Dome

1987 ◽  
Vol 24 (04) ◽  
pp. 321-331
Author(s):  
V. Bhujanga Rao
Keyword(s):  
Boundary Layer ◽  
Mathematical Model ◽  
Turbulent Boundary Layer ◽  
Boundary Layer Flow ◽  
Pressure Fluctuations ◽  
Structural Noise ◽  
Noise And Vibration ◽  
Relative Contribution ◽  
Turbulent Boundary Layer Flow ◽  
Layer Flow

A detailed study on the importance of flow-induced structural noise of a ship's sonar dome and its relative contribution to ship's sonar self-noise is presented. Flow-induced dome wall vibration statistics subjected to a turbulent boundary-layer flow are computed using a suitable mathematical model describing the turbulent boundary-layer pressure fluctuations. Various noise and vibration sources contributing to sonar self-noise are experimentally analyzed. The measured hull vibration amplitudes are compared with calculated dome wall vibration amplitudes in order to ascertain the importance of flow-induced dome wall vibration as a contributor to flow-induced structural noise.

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