Vortex shedding characteristics of eccentrically mounted prisms
Abstract
Experimental data on the vortex shedding characteristics of equiangular prisms mounted eccentrically in a wind tunnel are presented along with explanations for the possible flow behavior. The vortex shedding frequencies of the prisms were detected by a DISA hot film probe; the signals were recorded on magnetic tape and analyzed with the aid of a wave analyzer. After assessing the test data it was concluded that the vortex shedding frequency of a bluff body shape is significantly affected by the presence of a boundary in its neighborhood. The Strouhal number attained a maximum when the side gap was about equal to the base length of the prism. For very narrow gaps, variations in the Strouhal number were interpreted in terms of an equivalent twin body model, while the decrease in the Strouhal number for moderate gaps appeared to be a consequence of the deflection of the approaching flow.
- Publication:
-
Aeronautical Journal
- Pub Date:
- January 1975
- Bibcode:
- 1975AeJ....79...42R
- Keywords:
-
- Bluff Bodies;
- Flow Deflection;
- Prisms;
- Strouhal Number;
- Vortex Breakdown;
- Wind Tunnel Tests;
- Eccentricity;
- Flow Measurement;
- Hot-Film Anemometers;
- Magnetic Recording;
- Fluid Mechanics and Heat Transfer