Temporal and Spectral Features of Wall Pressure Fluctuations Beneath a Turbulent Boundary Layer PDF Download
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Author: Carolyn Ceder Karangelen
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 420
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Book Description
Author: Carolyn Ceder Karangelen
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 420
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Author: Eric Manoha
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: John S. Serafini
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 88
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Book Description
This experimental study was carried out at a free-stream Mach number of 0.6 and a Reynolds number per foot of 3.45 x 106. The magnitudes of the wall-pressure fluctuations agree with the Lilley-Hodgson theoretical results. Space-time correlations of the wall-pressure fluctuations generally agree with Willmarth's results for longitudinal separation distances. The convection velocity of the fluctuations is found to increase with increasing separation distances, and its significance is explained. Measurements with the longitudinal component of the velocity fluctuations indicate that the contributions to the wall-pressure fluctuations are from two regions, an inner region near the wall and an outer region linked with the intermittency.
Author: CHI-SHENG YANG, WILLIAM W. WILLMARTH
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Author: W. W. Willmarth, C. E. Wooldridge
Publisher:
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Category :
Languages : en
Pages : 60
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Author: Chi-Sheng Yang
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 101
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Measurements of the turbulent pressure field on the outer surface of a 3 inch diameter cylinder were made at a point 24 feet downstream of the origin of the turbulent boundary layer. The root-mean square wall pressure was 2.42 times the wall shear stress. The normalized power spectrum at high frequencies contained twice the energy density of the spectrum beneath a plane boundary layer. The convection speed was the same as that in a plane boundary layer but the eddy size was smaller by a factor of two. The smaller eddy size and unchanged convection speed account for the greater energy in the spectrum at high frequencies. (Author).
Author: M. V. Lowson
Publisher:
ISBN:
Category : Atmospheric pressure
Languages : en
Pages : 36
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 568
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Author: Brian E. McGrath
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ISBN:
Category : Boundary layer noise
Languages : en
Pages : 138
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Author:
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ISBN:
Category :
Languages : en
Pages : 26
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Book Description
Boundary layer transition is an important contributor to sensor flow-induced self noise. The pressure fluctuations caused by this spatially bounded and intermittent, phenomenon encompass a very wide range of spatial wave numbers and temporal frequencies. Here, we analyze the wavevector-frequency spectrum of the wall pressure fluctuations due to subsonic boundary-layer transition as it occurs on a flat plate under zero pressure gradient conditions. Based on previous measurements of the statistic of the boundary-layer intermittence it is found that transition induces higher low-streamwise wave number wall pressure level than does a fully-developed turbulent boundary layer (TBL) that might superficially exist at the same location and at the same Reynolds number. The transition zone spanwise wavenunmber pressure components are virtually unchanged from the TBL ease. The results suggest that transition may be more effective than the TBL in forcing structural excitation at low Mach numbers and it may have a more intense radiated noise contribution on a per unit area basis. This may help explain increases in measured sensor self noise when the sensors are placed near the transition zone.
