THE VORTEX FREQUENCIES OF BLUFF CYLINDERS AT LOW REYNOLDS NUMBERS

Experiments on the vortex shedding frequencies of selected bluff cylinders were conducted in the 1 1/2 ft by 4 ft (0.46 m by 1.2 m) test section of the Maryland University wind tunnel. The resulting data show how the Strouhal number and dimensionless frequency of an elliptical cylinder vary with flow incidence angle in the Reynolds-number range between 300 and 1200. These results are discussed in the light of the results of other investigations. Similar data are also presented for a square cylinder in the same range of Reynolds numbers. It is shown that the data for elliptical cylinders with eccentricities between 0.6 and 0.8 can be correlated over the range of Reynolds numbers between 500 and 10 to the fifth power. A correlation of data on Strouhal-number variation with angle of incidence, based on the projected height of the model, is obtained for both the square and elliptical models in the range of Reynolds numbers between 300 and 1200. The validity of the Independence Principle for flow past a yawed circular cylinder is examined. Experimental data, based on the velocity component normal to the cylinder, are presented for flow past a circular cylinder yawed 40 deg. These data are compared with those of other investigators. The combined data, which cover a wide range of Reynolds numbers, show a definite departure from the Independence Principle.

  • Corporate Authors:

    American Institute of Aeronautics and Astronautics

    1290 Avenue of the Americas
    New York, NY  USA  10019
  • Authors:
    • Knauss, D T
    • John, JEA
    • Marks, C H
  • Publication Date: 1976-10

Media Info

  • Features: Figures; References;
  • Pagination: p. 121-126
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00148575
  • Record Type: Publication
  • Source Agency: American Institute of Aeronautics and Astronautics
  • Files: TRIS
  • Created Date: Feb 23 1977 12:00AM