Accession Number:

AD0463575

Title:

AN EXPERIMENTAL STUDY OF THE EFFECTS OF BOUNDARY LAYER THICKNESS AND VELOCITY PROFILE ON THE PRESSURE DISTRIBUTIONS OF OBJECTS IMMERSED IN THE BOUNDARY LAYER

Descriptive Note:

Final rept., Oct 1963-Sep 1964

Corporate Author:

MARYLAND UNIV COLLEGE PARK DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

Report Date:

1965-02-01

Pagination or Media Count:

49.0

Abstract:

Pressure distributions were measured on six models in three different boundary layer conditions. Two hemispheres, two semicylinders, and two half bodies of revolution were used in the tests. The range of Reynolds numbers for the hemispheres and semicylinders was form 0.6 x 60,000 to 1.6 x 160,000 based on diameter and free stream velocity. The boundary layer thicknesses ranged from about one-half to twice the characteristic model dimension. The effect of increasing boundary layer thickness or momentum thickness was a reduction in the positive and negative ordinates of the pressure distributions. The pressures on three-dimensional models were approximately the same at a given longitudinal station, although there may have been a small reduction in pressures close to the wall on which the object was mounted. No simple relationship could be found for relating the changes in pressure distribution to changes in velocity profile or boundary layer thickness, however a data correlation was obtained relating the minimum pressure coefficient for a particular boundary layer condition to the minimum pressure coefficient measured in a uniform flow.

Subject Categories:

  • Theoretical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE