Accession Number:

ADA061470

Title:

Experimental Axisymmetric Boundary-Layer Profile Modifications by the Addition of Surface Roughness Screens.

Descriptive Note:

Technical memo.,

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s):

• Robbins,B. E.

Report Date:

1978-03-24

Pagination or Media Count:

76.0

Abstract:

The boundary-layer velocity profile on an axisymmetric aerodynamic body was modified by the use of surface roughness screens. The velocity profiles were measured at a body location of xL0.970 for various screen configurations placed near the nose. These results obtained in air, were determined to allow the simulation of the boundary-layer velocity profile on longer models at different Reynolds numbers. Results were obtained for three different screen mesh sizes and three screen lengths up to 60.96 cm 24 inches in different configurations. The following boundary-layer characteristics are given for each configuration boundary-layer thickness, planar displacement and momentum thickness, axisymmetric displacement and momentum thickness, planar and axisymmetric shape factor, friction velocity, skin friction coefficient, wall shear stress, and the planar universal boundary-layer parameters. Author

Descriptors:

• *SURFACE ROUGHNESS
• *TURBULENT BOUNDARY LAYER
• *SKIN FRICTION
• VELOCITY
• AERODYNAMIC CONFIGURATIONS
• SIZES(DIMENSIONS)
• MODIFICATION
• MESH
• PROFILES
• SHEAR STRESSES
• AXISYMMETRIC
• SCREENS(WOVEN MATERIALS)

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE