Accession Number:

ADA247781

Title:

Laminar Boundary Layer Stability on a Heated, Underwater Body

Descriptive Note:

Technical memo

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s):

• Lauchle, G. C.
• Gurney, G. B.

Report Date:

1983-09-09

Pagination or Media Count:

59.0

Abstract:

A large 3.05m long x 0.32m diameter heated-surface, axisymmetric body, designed for transition research in a 1.22m diameter water tunnel is described. Boundary layer transition data are presented as functions of the heating power supplied to the body and the total concentration of free-stream particulate matter in the water. Body surface temperatures range from 0 to 25 deg C over the ambient water temperature, and the total heat supplied ranges from 0 to 93.3 kW. Transition arc length Reynolds numbers are found to vary from 4.5 million for the body operating cold to 36.4 million for the maximum heat level considered. The concentration of free-stream particles is shown to affect transition Reynolds number. These particles range in diameter from 10 to 70 micron and their concentration ranges from less than 5 to 198 particles per cm3. The decrease in transition Reynolds number due to the higher concentration of particles is of order 30 percent. Laminar, Boundary layer, Heated, Underwater, Body.

Descriptors:

• *BOUNDARY LAYER TRANSITION
• FUNCTIONS
• DIAMETERS
• TEMPERATURE
• LAYERS
• BOUNDARY LAYER
• SURFACES
• BOUNDARIES
• FREE STREAM
• LAMINAR BOUNDARY LAYER
• WATER TUNNELS
• UNDERWATER
• REYNOLDS NUMBER
• BODIES
• PARTICLES
• TEMPERATURE GRADIENTS
• LENGTH
• HEATING
• AXISYMMETRIC
• PARTICULATES
• POWER

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE