An investigation of pressure fluctuations around a circular cylinder
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Authors
Rodgers, Barry.
Smith, Frederick D.
Subjects
Advisors
Date of Issue
1962-06
Date
Publisher
Cranfield, England: College of Aeronautics
Language
en_US
Abstract
For many years the periodic nature of the flow around bluff bodies has interested investigators. This investigation was conducted to increase the knowledge of pressure distributions and pressure fluctuations on the surface of a circular cylinder. Measurements were made of the root mean square values of the pressure fluctuations around the cylinder, and frequency analyses of the fluctuating pressures were performed. A condenser microphone fitted with a 2 m.m. probe was mounted in each cylinder to serve as the pressure transducer, and a narrow band (4 c/s) wave analyser was used for the frequency analyses. Comparison of the mean pressure .measurements and the measurements of fluctuations at the Strouhal frequency and its second harmonic compare favourably with previous experiments. Acoustic signals were found in pairs at frequencies separated by the second harmonic of the Strouhal frequency. The centre frequency of these pairs was constant over a range of Reynolds number from 0.4 x 10⁵ to 3.2 x 10⁵ using three different diameter cylinders. These measurements fail to support the only existing theory regarding acoustic signals associated with flow around a circular cylinder.
Type
Thesis
Description
Series/Report No
Department
Aerodynamics