Vortex Shedding Frequencies for a Cylinder in Confined Flow.

reportActive / Technical Report | Accession Number: ADA102414 | Open PDF

Abstract:

Measurements are presented of vortex shedding frequencies for circular cylinders in confined flows. Experiments have been performed at Reynolds numbers up to 20,000. The range of blockage ratios covered was 0.18-0.33. Systematic changes in the shedding frequency were observed with increasing blockage, the effect being greatest at Reynolds numbers of a few thousand. Measurements of the Reynolds number for which vortex shedding just begins show that the confining walls increase the stability of the flow round the cylinder. The shedding frequency was determined using constant temperature hot wire anemometry, and also using the vibration response of a magnetometer, a method which, we feel, offers some advantages over conventional techniques. Author

Author(s):
Rees, W. G. ; Wilby, W. A.
Author Organization(s):
CAMBRIDGE UNIV (ENGLAND) CAVENDISH LAB
Descriptive Note:
Interim rept.,
Supplementary Note:
DOI: 10.21236/ADA102414
Pagination:
0021

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFOSR-TR-81-0598
Contract/Grant Number(s):
AFOSR-79-0057
Task Number(s):
A2
Project Number(s):
2307
Monitor Series:
TR-81-0598
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6.3_Net Management; JCA_6_Net Centric; JCA_1.2_Force Preparation; JCA_1_Force Support
Modernization Areas:
Directed Energy
Communities of Interest:
Sensors
Descriptor(s):
*VORTEX SHEDDING, *FLOW SEPARATION, MEASUREMENT, VIBRATION, CYLINDRICAL BODIES, WAKE, WALLS, REYNOLDS NUMBER, FREQUENCY RESPONSE, HOT WIRE ANEMOMETERS, MAGNETOMETERS
Field(s)/Group(s):
Fluid Mechanics
Keyword(s):
Confined flow, WUAFOSR2307A2, PE61102F
Report Date:
1981 Mar 10