Effect of Local Surface Roughness on Turbulent Boundary Layer-Wall Pressure Spectra and Transition Burst Onset.

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Abstract:

An experimental study of boundary-layer velocity profiles and turbulent wall-pressure spectra on a smooth flat plate with varying localized roughness conditions is reported. The sandpaper surface roughness ranged from a smooth wall to the fully rough condition. Transition and turbulent flow data are consistent with those in the published literature. In addition, new data have been obtained for the wall-pressure spectra for a complete range of roughness conditions. Formulas for estimating the increase in wall spectra levels due to varying surface-roughness conditions are presented.

Author(s):
O'keefe, Edmund J. ; Casarella, Mario J. ; Demetz, Frederick C.
Author Organization(s):
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
Descriptive Note:
Formal rept.,
Pagination:
0067

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
DTNSRDC-4702
Task Number(s):
SF43452702, 18186
Project Number(s):
SF43.452
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6.3_Net Management; JCA_6_Net Centric
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*SURFACE ROUGHNESS, *TURBULENT BOUNDARY LAYER, *BOUNDARY LAYER FLOW, VELOCITY, PRESSURE GRADIENTS, MATHEMATICAL ANALYSIS, WIND TUNNEL TESTS, WALLS, FLOW NOISE, HYDROPHONES, BOUNDARY LAYER TRANSITION, OCEAN ENVIRONMENTS, HYDRODYNAMICS, TEST FACILITIES, ANECHOIC CHAMBERS
Field(s)/Group(s):
Fluid Mechanics
Keyword(s):
Most project 2
Report Date:
1975 Dec 01