Accession Number : AD0616186

Title :   MEASUREMENTS OF FLUCTUATING AIR LOADS ON A CIRCULAR CYLINDER.

Descriptive Note : Revised ed.,

Corporate Author : CALIFORNIA INST OF TECH PASADENA

Personal Author(s) : Schmidt,L. V.

Report Date : 25 SEP 1964

Pagination or Media Count : 7

Abstract : Measurements were made of the unsteady air loads, both lift and drag, developed on a circular cylinder when exposed to flow normal to the axis of symmetry in the supercritical Reynolds number range from 0.38 X 1000000 to 0.75 X 1000000. The three-dimensional nature of the flow, which is a consequence of the separated viscous flow, is recognized. A statistical description of the spatially varying random-type air loads is provided by cross-spectral densities and crosscorrelation coefficients. Information of this type, when defined in detail, has application to the response problem of a cylindrical structure that is exposed to air loads. An unusual trait that was observed was the extreme sensitivity of the flow to surface irregularities in the supercritical Reynolds number region. In addition to an influence upon the local and spatial character of the fluctuating loads, steady-state values of local lift could be induced by suitably orienting surface disturbances on the forward portion of the cylinder. (Author)

Descriptors :   (*CYLINDRICAL BODIES, AERODYNAMIC LOADING), (*AERODYNAMIC LOADING, CYLINDRICAL BODIES), LIFT, DRAG, MEASUREMENT, REYNOLDS NUMBER, SEPARATION, THREE DIMENSIONAL FLOW, STATISTICAL ANALYSIS, VORTICES

Distribution Statement : APPROVED FOR PUBLIC RELEASE